Part One: The Hinge

On December 18, 1991, President George H. W. Bush signed the Intermodal Surface Transportation Efficiency Act of 1991 in Euless, Texas. The ceremony closed the Interstate construction era and opened a different one. The statute arrived as Public Law 102-240, printed at 105 Stat. 1914, and it authorized six years of federal surface programs, fiscal 1992 through fiscal 1997, at a scale the Congressional Research Service later scored at 151 billion dollars. The namable claim of this profile is simple: “From building to allocating.” For thirty five years federal transportation policy had meant one thing above all, financing the construction of a national highway network. This law redirected the federal role toward deciding how a completed system should be used, and it moved those decisions out of Washington into metropolitan regions.

The country that received the statute was finishing the largest public works project in its history. A 1991 report from the General Accounting Office, numbered RCED-91-147, described an Interstate System of more than 44,000 miles and called it nearly complete. The final original segment, through Glenwood Canyon on Interstate 70 in Colorado, would open to traffic on October 14, 1992, ten months after the signing. Since 1956 Washington had paid roughly ninety percent of Interstate construction costs and left the building to state highway departments operating under federal standards. That bargain had been extraordinarily productive at pouring concrete and extraordinarily narrow in what it asked about the concrete. It did not ask whether a region needed a highway or a rail line. It did not ask whether a new road would help a region meet air quality standards. It asked whether the segment met the standards and whether the money was obligated. ISTEA asked the missing questions and rewrote the institutions that would answer them.

Three mechanisms carry the change, and a reader who can explain them has understood the statute. First, the law moved real project selection authority into metropolitan regions, giving metropolitan planning organizations the power to choose federally funded projects in the largest urbanized areas. Second, it bound transportation plans to air quality law, so that a region whose air violated federal standards could not spend federal transportation money on a plan that deepened the violation. Third, it let money cross the old modal walls, permitting highway funds to pay for transit capital and letting funds move among the highway programs. Those three transfers, of authority to regions, of legal constraint from air quality law, and of dollars across modal boundaries, form the test this profile must pass.

The money deserves a clear statement before the detail begins. Six fiscal years, fiscal 1992 through fiscal 1997, with the Congressional Research Service scoring the authorization at 151 billion dollars and the Federal Highway Administration’s contemporaneous program guide describing about 155 billion. The difference between the two figures reflects scoring conventions, not disagreement about the statute, and both numbers describe the same six year commitment. The Research Service later divided its figure into roughly 119 billion dollars for highways and 32 billion for mass transit. The dollars flowed through the Highway Trust Fund and the transit accounts much as before, which is why the durability of ISTEA lies less in its sums than in its procedures. The sums were large. The procedures were larger, and they survived into every later authorization.

This profile walks the statute in the order the statute itself follows, because the structure of a public law is evidence about what its authors thought mattered. It opens with identity and the moment of 1991, sets down five anchored facts, reconstructs the passage through committee rooms and floor votes, and then moves provision by provision: the National Highway System, the Interstate maintenance program, the Surface Transportation Program, the Congestion Mitigation and Air Quality program, the planning rewrite, the flexibility rules, the enhancements set aside, the transit titles, safety, and research. A separate part explains the conformity mechanism in full, and an artifact table maps the authority shift decision by decision. Implementation, measured effects, the counter reading, and the myths follow, with a research guide at the close.

Every operative claim here traces to the statute text, the conference report, committee prints, or the named official sources that scored and studied the law: the Congressional Research Service, the General Accounting Office, the Federal Highway Administration, and the Congressional Record. Where figures appear, their source is named. Where constituencies disagreed, their positions are presented with the care the record requires, because the fight over ISTEA was a fight over who would control American transportation for the next generation, and it deserves to be reported as one.

Part Two: The Name and the Moment

Each word of the short title was doing work. Intermodal announced that the law would treat highways, transit, rail, bicycles, and pedestrian facilities as parts of one system rather than as separate fiefdoms with separate pots of money. Surface distinguished the bill’s domain from aviation and maritime policy, which lived in different authorizations. Transportation named the enterprise as mobility itself, not road construction as such. Efficiency promised the taxpayer that the point was getting more movement per dollar, a promise aimed at a Congress that had spent the 1980s arguing about deficits. The short title told every reader the bargain on offer: keep the money flowing, but spend it more flexibly, more locally, and with cleaner air as a condition.

The formal identity is uncomplicated and worth fixing precisely. Public Law 102-240 of the 102nd Congress, enacted as H.R. 2950, printed at 105 Stat. 1914, with a long title reading as an act to develop a national intermodal surface transportation system, to authorize funds for construction of highways, for highway safety programs, and for mass transit programs, and for other purposes. That long title places intermodalism first, before highways, before safety, before transit. The ordering was deliberate. The statute announced a system, not a road program with appendages.

The law carried a cluster of short titles for its component parts, recorded by the Congressional Research Service in its summary of the conference report. The transit portion was the Federal Transit Act Amendments of 1991. The safety portions carried the names Highway Safety Act of 1991, Motor Carrier Act of 1991, and National Highway Traffic Safety Administration Authorization Act of 1991. The revenue title was the Surface Transportation Revenue Act of 1991. Research traveled under the Intelligent Vehicle-Highway Systems Act of 1991, and trails under the Symms National Recreational Trails Act of 1991. A Congress assembling one vehicle from pieces that had previously moved, if they moved at all, as separate bills with separate coalitions shows in that list.

One curiosity of the record deserves preservation. As introduced in the House, H.R. 2950 was titled the Intermodal Surface Transportation Infrastructure Act of 1991. The word Infrastructure became Efficiency somewhere in the legislative process, and the enacted short title uses Efficiency. The change was not cosmetic. Infrastructure named things, concrete and steel. Efficiency named a relationship between things, the ratio of movement to investment. The statute that emerged was organized around that ratio: flexibility provisions, planning requirements, and air quality hooks all assumed that the central question was how to use capacity wisely, not how to add it.

The codification footprint shows how broadly the law reached. The statute amended titles 15, 23, 26, 33, and 49 of the United States Code, touching commerce and trade, highways, the Internal Revenue Code, navigation, and transportation. Title 23, Highways, absorbed the largest share, since the federal aid highway program was rewritten around the new structure. Title 49 absorbed the transit amendments. The revenue title reached into the Internal Revenue Code to extend the taxes feeding the Highway Trust Fund. A statute that amends five titles of the Code is not a narrow program extension. It is a reorganization of the federal presence in its field.

The 1991 moment made the bargain possible, and four facts defined it. First, the Interstate System was nearly complete. The General Accounting Office report RCED-91-147 stated the system spanned more than 44,000 miles, and the great construction rationale that had disciplined federal transportation policy since the Federal-Aid Highway Act of 1956 was running out of road to build. Second, the Clean Air Act Amendments of 1990 had just rewritten the country’s air quality obligations, designating nonattainment areas across the metropolitan map and giving the conformity requirement in section 176(c) of the Clean Air Act real force for the first time. Transportation plans could no longer treat the air as someone else’s problem. Third, the Highway Trust Fund held balances that both parties wanted to spend, while the budget rules of the era demanded that new spending be paid for. A six year authorization let Congress promise states a predictable pipeline of money without annual appropriations fights. Fourth, metropolitan America had outgrown the state highway department as a decision maker. The census of 1990 confirmed what commuters already knew: the country moved in metropolitan regions, and the governments that understood those regions best were not always the ones in the state capital.

None of this made the statute inevitable. The Bush administration’s transportation proposal emphasized a new National Highway System and offered states less flexibility than Congress would eventually grant. The Congressional Research Service later calculated that the enacted authorization ran about 46 billion dollars above what the President had requested and nearly doubled the transit figure the administration had sought. Transit advocates had spent the 1980s watching operating subsidies shrink, and the American Public Transportation Association had called the 1987 reauthorization, the Surface Transportation and Uniform Relocation Assistance Act, a highway bill in transit clothing. State highway officials feared that flexibility was a polite word for diversion. Environmental groups feared that flexibility was a polite word for more asphalt. Each of those fears surfaced in the legislative fight, and each left a mark on the final text.

The economic weather of 1991 shaped the bill’s reception. The country was in recession, more than thirty states were operating under deficit budgets, and Representative Robert A. Roe of New Jersey, chairman of the House Public Works and Transportation Committee, framed the transportation bill as countercyclical stimulus. At the committee’s first hearing on the legislation in February 1991, Secretary of Transportation Samuel Skinner defended the administration’s approach and, in the account of the Washington Post, received an earful of criticism from members of both parties. The National Governors Association, speaking through Governor Wallace Wilkinson of Kentucky, warned that if states were expected to contribute larger matching shares, many would have to divert money from maintenance or ask taxpayers to pay more. The recession made every formula fight and every matching share a fight about state budgets, not just about transportation philosophy.

The Senate’s theory belonged to Daniel Patrick Moynihan of New York, the principal architect of the Senate bill, whom the Congressional Record would later call the father of ISTEA. Moynihan said the country had poured enough concrete and that it was time to get more transportation out of the roads already built. He introduced the Senate legislation with four cosponsors, Senators Quentin Burdick of North Dakota, Steve Symms of Idaho, John Chafee of Rhode Island, and Frank Lautenberg of New Jersey, a bipartisan roster that signaled the bill’s unusual coalition from the start. In later remarks on the Senate floor, Moynihan recalled that he and his House counterpart, Chairman Roe, had hoped to develop a federal highway bill marking the end of the Interstate construction era. The partnership across chambers and across party lines was the engine of the statute.

The administration, through Secretary Skinner and Federal Highway Administrator Thomas Larson, pushed a narrower vision. Larson testified that while the country was moving into the post Interstate construction era, it was not ready for a post highway transportation economy, and he warned that fifty strong state programs would not necessarily produce a strong national program. Moynihan’s answer to that vision had a name: the level playing field. The phrase meant that federal transportation dollars should be available for whichever mode moved people and goods most efficiently in a given corridor, rather than being locked by statute into highway uses. The eighty percent federal share for most programs, against ninety percent for Interstate work, was the fiscal expression of the argument. Washington would no longer pay a premium that biased every state decision toward highway construction.

The 1987 law the statute answered

The predecessor law set the terms of the debate. The Surface Transportation and Uniform Relocation Assistance Act of 1987 had been a conventional reauthorization: more money, the same structure, the same state centered decision making. By 1991 its limits were visible to everyone except its most committed defenders. The Interstate System was nearly complete, which meant the law’s central purpose was expiring. The categorical programs had multiplied into a thicket that the Research Service and the highway agency both described as difficult to administer. Transit funding had been squeezed through the 1980s, and the transit community’s verdict on the 1987 law, that it was a highway bill wearing transit clothes, in the American Public Transportation Association’s phrase, had hardened into a political fact that the 1991 Congress could not ignore. ISTEA was written against that background, and its structural ambitions, the program consolidation, the flexibility, the planning rewrite, were all answers to failures that the 1987 law had displayed.

Part Three: Five Anchors

A statute this large rewards a reader who carries a short list of fixed points. Five anchors hold the interpretation steady when the details start to blur.

The first anchor is the citation itself. Intermodal Surface Transportation Efficiency Act of 1991, Public Law 102-240, 105 Stat. 1914, enacted as H.R. 2950, signed December 18, 1991, by President George H. W. Bush. In the transportation literature the number 102-240 functions as shorthand the way practitioners cite the Code, and it is the key that unlocks the enrolled text, the conference report H. Rept. 102-404, and the signing statement. Any provision that cannot be found in Public Law 102-240 belongs to a different law, most often one of the successor reauthorizations that amended its provisions. That discipline is the first defense against the most common errors in writing about the statute.

The second anchor is the money and the clock. Six fiscal years, 1992 through 1997, with the Congressional Research Service scoring the authorization at 151 billion dollars and the Federal Highway Administration’s contemporaneous guide describing about 155 billion. The authorization expired September 30, 1997, and the Service records a single six month extension before the next authorization. The figure to carry forward is 151 billion over six years as the CRS-scored authorization, with the FHWA figure noted as the contemporaneous program guide’s estimate. The distinction teaches a research habit worth keeping: authorization totals vary with scoring conventions, and the honest practice is to name the scorer with the number.

The third anchor is the population threshold that reorganized power. An urbanized area of more than 200,000 people became a transportation management area, and within such areas the statute moved project selection authority to the metropolitan planning organization. The definition lives in the planning regulations at 23 CFR 450.104, and the selection rule lives in 23 U.S.C. 134 as rewritten by the statute. Within a TMA the MPO selects federally funded projects from the transportation improvement program in consultation with the state and any affected public transportation operator, while NHS, bridge, and Interstate maintenance projects in the same area are selected by the state in cooperation with the MPO. The number 200,000 is the hinge of the authority shift, and it appears more than once in this profile because the statute returns to it more than once.

The fourth anchor is the ten percent set aside for transportation enhancements. Section 133(d)(2) of title 23, as written by ISTEA, reserved ten percent of each state’s Surface Transportation Program apportionment for ten named categories of enhancements, from pedestrian and bicycle facilities through historic preservation and archaeological planning. The full enumeration belongs to Part Seven, but the anchor function here is to fix the number: ten categories, no more. Later laws added categories that are sometimes misattributed to ISTEA, and the enrolled text is the control against that folklore. The set aside was the most visible symbol of the statute’s intermodal ambition, the provision opponents cited as proof that highway user fees were being diverted and supporters cited as proof that transportation had finally been defined to include the ways people actually move through communities.

The fifth anchor is the conformity hook. Section 176(c) of the Clean Air Act, codified at 42 U.S.C. 7506(c), prohibits the Department of Transportation, the Federal Highway Administration, and the Federal Transit Administration from supporting or approving any transportation plan, program, or project unless it conforms to the approved state implementation plan for air quality. That prohibition came from the 1990 Clean Air Act amendments, not from ISTEA. ISTEA’s contribution was the planning rewrite at 23 U.S.C. 134 and 135, which made the long range plan and the transportation improvement program the documents to which the conformity requirement attaches and made federal approval of those documents the action the prohibition governs. The anchor fixes the legal fact that the 1990 law wrote the air quality budgets and the 1991 law wrote the machinery that made those budgets constrain transportation plans.

Each of these anchors rests on a documented source chain, and laying out the chain is part of the profile’s work, because ISTEA is one of the most misremembered statutes in the transportation literature. The citation anchor verifies against the enrolled bill and the Congress.gov legislative record for H.R. 2950, which carries the full action history from introduction on July 18, 1991, through the conference report and the December 18 signing. The enrolled bill file digitized by the Eno Center for Transportation from the George H. W. Bush Presidential Library supplies the signing statement, the ceremony transcript, and the White House fact sheet, so the signing date and the administration’s public account are matters of archival record rather than recollection. The funding anchor verifies against the CRS vote tables for surface transportation authorizations, which record the fiscal 1992 through 1997 window, the September 30, 1997 expiration, and the single six month extension. The threshold anchor verifies in two places, the planning regulations and the rewritten section 134, with the pre 1991 baseline documented in the structure of the 1956 Act and its successors. The enhancements anchor verifies against 23 U.S.C. 133(d)(2) as enacted, with the enrolled text as the control against later additions. The conformity anchor verifies against the interaction of the two statutes, the 1990 amendments supplying the prohibition and ISTEA supplying the planning documents and approval actions.

Part Four: How the Bill Became Law

The legislative path ran from committee hearings in the winter of 1991 to a signing ceremony in Texas in December, and it was a genuine contest, not a coronation. The House moved first in form but last in time. The Senate moved early, passed its bill in June, and then waited while the House built its version through the fall. The conference compressed months of disagreement into eleven days of meetings in November, and the final votes, 372 to 47 in the House and 79 to 8 in the Senate, both on November 27, concealed how close the bill had come to a presidential veto.

Chairman Roe opened the House effort by convening the Committee on Public Works and Transportation for its first hearing on the legislation on February 20, 1991. Roe had told the Transportation Committee of the United States Conference of Mayors in late January that he and Speaker Thomas S. Foley saw the transportation bill as a countercyclical stimulus opportunity in a recession economy, and he signaled that the committee would support a national highway system concept and greater flexibility while expecting demonstration project earmarking to increase. Secretary Skinner appeared at the February hearing to defend the administration’s bill, which the committee treated skeptically. The administration wanted a tightly focused national highway system program with limited flexibility and limited spending. The committee wanted a larger, more flexible program that spread benefits across modes and regions. That disagreement structured everything that followed.

The Senate path ran through the Committee on Environment and Public Works, where Moynihan’s bill, S. 1204, carried the intermodal vision in its strongest form. The Senate passed S. 1204 on June 19, 1991, by a vote of 91 to 7, a margin that reflected the bill’s bipartisan sponsorship and the appeal of its flexibility provisions to senators from both urban and rural states. But the administration’s objections followed the bill to the floor. The Bush administration indicated it could not support the Senate measure because it did not include the administration’s recommended National Highway System and did not focus federal resources on highways of national interest. To avoid a presidential veto, the Senate amended the bill on the floor to include funding for a National Highway System. The amendment was the price of viability, and it foreshadowed the conference fight over how strong the NHS program would be.

The Senate’s 91 to 7 passage deserves a closer look, because the margin concealed the work that produced it. Moynihan had introduced his bill with four cosponsors, and the committee’s markup had to reconcile the interests of donor states, which paid more in highway taxes than they received, with donee states, which received more than they paid. The donor donee fight was the perennial shadow over every highway authorization, and ISTEA’s formulas, the minimum allocation provisions, and the demonstration projects all carried traces of it. The 91 to 7 vote meant the committee had found a formula balance that nearly the entire Senate could accept, and that balance became the Senate’s negotiating position in conference: formulas first, projects second, flexibility throughout.

The House bill, H.R. 2950, was introduced on July 18, 1991, by Representative Norman Y. Mineta of California, and the Committee on Public Works and Transportation reported it, as amended, on July 26 as H. Rept. 102-171, Part I. The Committee on Ways and Means, which held jurisdiction over the revenue title, reported its portion on August 2 as Part II of the same report. The two part report structure is itself evidence of the bill’s scope: authorizing committees could not move a measure of this size without the tax writing committee, and the revenue title’s extension of Highway Trust Fund taxes required Ways and Means concurrence. The House bill carried a large number of designated projects of all types, expressing the House’s traditional view that named projects were a legitimate expression of congressional priorities, while the Senate bill, in keeping with the upper chamber’s preference for formulas over earmarks, carried far fewer. The full House took up the bill in October, and the debate, which the New York Times called perfunctory, ended on October 23 with passage by a recorded vote of 343 to 83, Roll no. 338. The margin was veto proof, a fact that mattered in the weeks that followed.

The veto threat was real and specific. On October 15, Secretary Skinner wrote to Chairman Roe outlining the administration’s objections and stating that he would recommend a veto if the bill passed Congress in its then current form. Addressing the American Association of State Highway and Transportation Officials in Milwaukee the previous day, Skinner had said the bill did not provide enough funding for the National Highway System, was inadequate on matching shares, and continued operating subsidies for transit. The administration opposed extension of the 2.5 cent gasoline tax to pay for the program, and Skinner charged that even after a reduction in demonstration projects, the bill still contained about five billion dollars in earmarked pork. The demonstration projects, congressionally directed earmarks for specific highway projects, were the most explosive single issue. The administration saw earmarks as a corruption of formula driven program structure. Members of Congress saw them as the tangible return their districts expected from a major authorization.

The Senate’s spring

In the Senate, the Environment and Public Works Committee built the bill through the spring of 1991. The committee held hearings on the competing drafts, including S. 823 and S. 965, in May, and the full committee’s product, S. 1204, reached the floor in June. Moynihan managed the bill with the support of the committee’s senior figures: John Chafee of Rhode Island, the ranking Republican, whose environmental credentials gave the bill bipartisan cover; Quentin Burdick of North Dakota, the full committee chairman, whose influence on highway legislation spanned decades; and Frank Lautenberg of New Jersey, a committed transit advocate. The Senate passed S. 1204 on June 19 by 91 to 7, a margin that reflected the bill’s formula driven, state friendly design. The Senate bill gave states broad flexibility, set the eighty percent federal share as the norm, and avoided the designated projects that the House loved. It was, in the Research Service’s later description, the states’ version of the post Interstate settlement. Then the Senate waited, while the House built its version through the fall, and the two theories of federalism moved toward their November collision.

The Senate took up the House bill on October 31 and passed it in lieu of S. 1204, with an amendment, by voice vote. The procedural choreography, substituting the House bill number for the Senate’s own, preserved the constitutional requirement that revenue measures originate in the House while carrying forward the Senate’s substantive positions into conference. Conferees were named on November 6. Before the conference convened, Representative Hammerschmidt moved to instruct the House conferees to insist on the provisions of title I as passed by the House providing for a strong national highway system program. The House agreed to the instruction by a recorded vote of 394 to 3, Roll no. 384, a near unanimous signal that the House would not accept a conference product that weakened the NHS commitment.

The conference met four times, on November 7, 12, 14, and 16, and the conferees agreed to file the report on November 26. The conference report, H. Rept. 102-404, was filed on November 27. The issues in the room were the ones the whole year had been about: the size and funding of the National Highway System, the strength of the flexibility provisions, the matching shares, the transit operating subsidies, the demonstration projects, and the planning and conformity requirements. The House conferees arrived bound by the 394 to 3 instruction on the NHS. The Senate conferees arrived committed to the intermodal and flexibility provisions that were Moynihan’s signature. The administration hovered over the proceedings through the veto threat, which gave the conferees an incentive to produce a bill the President could sign without surrendering the provisions that made the bill worth passing.

Both chambers acted on the conference report on November 27, the same day it was filed. The House agreed to the report by the yeas and nays, 372 to 47, Roll no. 440. The Senate agreed by a yea nay vote of 79 to 8, Record Vote No. 277. The margins were commanding, and they reflected the breadth of the coalition: highway interests got the National Highway System and the Interstate maintenance program, transit interests got the transit title and the flexibility provisions, environmental interests got CMAQ and the enhancements set aside and the planning rewrite, and members got the demonstration projects. The enrolled bill was presented to the President on December 10. President Bush signed it on December 18, 1991, at the ceremony in Euless, Texas, and the White House press office released a fact sheet and a signing statement with the enrolled bill file that the Eno Center for Transportation later digitized from the George H. W. Bush Presidential Library.

Press coverage at the time captured the sense of a break. The Los Angeles Times called the measure a landmark, and USA Today called it the most sweeping redirection of transportation policy in thirty five years. Those characterizations, offered in October 1991 as the bill moved, are useful because they show that contemporaries understood what was happening. This was not a routine extension. It was a redefinition, undertaken with unusual speed, in the last months of a Congress, against a veto threat, in a recession, at the end of the Interstate era.

The passage history supports two conclusions that matter for reading the statute. First, the veto proof House margin and the lopsided conference votes show that ISTEA was not a narrow ideological victory but a logroll of unusual breadth, which is why its provisions pull in different directions and why later debates about its meaning replay the original coalition’s disagreements. Second, the speed of the final action, conference filed and both chambers agreed on the same November day, shows a Congress determined to finish before the session’s end, which is why the statute left significant operational detail to regulation. The planning rules, the conformity rule, and the NHS designation all had to be worked out after enactment.

The conference bargains

The conference that produced the final text was a negotiation among three distinct positions, and the enrolled bill shows where each won and where each yielded. The administration, speaking through Secretary Skinner, wanted a tightly focused National Highway System program, higher state matching shares, no continued transit operating subsidies, no extension of the 2.5 cent gasoline tax for the program, and far fewer demonstration project earmarks. The House, bound by its 394 to 3 instruction, wanted a strong NHS program with robust funding and the flexibility provisions its committee had built. The Senate wanted the intermodal architecture intact, with the planning rewrite, the CMAQ program, and the transfer authorities that were Moynihan’s signature contributions. The conference report reconciled these positions by giving each side its highest priority while trimming at the margins.

The demonstration projects illustrate the method. Skinner had charged that the House bill still contained about five billion dollars in earmarked pork even after a reduction, and he made the earmarks a centerpiece of his October 15 veto recommendation letter to Chairman Roe. The conferees reduced the earmark load from the House passed level without eliminating the practice, giving the administration a cut it could cite and the members the projects their districts expected. The Senate acquiesced in the House’s project provisions and added projects of its own, while the two sides negotiated the treatment of the projects under the obligation limitations that appropriations legislation imposed on highway spending. The earmark fight also explains why the statute’s program structure sections read as formula driven while pages of the conference report direct money to named locations. Both things were true at once, and the tension between formula programs and directed spending became a permanent feature of surface transportation authorizations.

The National Highway System bargain ran in the opposite direction. The administration had proposed a system of about 155,000 miles and wanted it to be the centerpiece of federal highway investment. The Senate had initially been cooler, and only the floor amendment adding NHS funding had made S. 1204 viable in concept. The House instruction demanded a strong NHS program. The conference delivered one, with the NHS program receiving the largest highway funding stream in the Act. The highway community, which had feared that intermodal rhetoric would dissolve the federal highway commitment, got a legislatively defined network of national significance with dedicated money. The price was the flexibility architecture surrounding it: the STP, the transfer authorities, the enhancements set aside, and the planning requirements that the highway community had resisted. Each side’s victory was real, and each side’s victory was bounded by the other’s.

The revenue title was the quietest bargain and in some ways the most consequential. The Surface Transportation Revenue Act of 1991 extended the Highway Trust Fund taxes, and the Ways and Means Committee’s separate report, Part II of H. Rept. 102-171, carried the provisions. Without the revenue title there was no six year authorization, and without Ways and Means there was no revenue title. The trust fund’s highway and transit accounts survived the negotiation intact, which meant the flexibility provisions would move money between programs without merging the accounts that defined the federal fiscal structure.

Part Five: The Provisions, First Movement

Title I of ISTEA carried the federal aid highway programs, and its architecture tells the story of a Congress deciding what the federal highway program was for after the Interstate. The title opens with the declaration that the authorizations for construction of the Dwight D. Eisenhower National System of Interstate and Defense Highways made by the Act are the final authorizations of appropriations and apportionments for completion of construction of the Interstate System. That sentence, recorded in the Congressional Research Service summary of the conference report, is the statute’s formal farewell to the construction era. Everything that follows in the title is organized around a different question: with construction ending, where should federal highway money go.

The National Highway System was the statute’s answer to the question of national significance. Section 1006 of the Act created the system and rewrote section 103 of title 23 around it. The old federal aid structure had recognized four systems, Interstate, Primary, Secondary, and Urban, covering about 851,000 miles of the nation’s nearly four million miles of road. ISTEA collapsed that structure into two: the National Highway System, with the Interstate System as a designated component within it. The Federal Highway Administration’s contemporaneous guide described the new framework as encompassing about 920,000 miles of federal aid eligible roadway, served by a new block grant style program for roads outside the NHS.

Congress did not draw the NHS map itself. It directed the Secretary of Transportation to propose the system and capped it at 155,000 miles, plus or minus fifteen percent, with designation to be completed within two years. The cap mattered. It forced choices. The system was to include the Interstate routes, the defense strategic highway network, strategic highway connectors serving military installations and ports, and the principal arterials that carried the heaviest intercity and interstate travel. Everything else that had lived on the old Primary, Secondary, and Urban systems would have to find its home in the new Surface Transportation Program or lose federal aid eligibility. The two year designation deadline created one of the first implementation dramas of the ISTEA era, as states, metropolitan bodies, and the Department negotiated which corridors made the cut. Congress completed the formal designation in 1995 through separate legislation.

The NHS also carried a defense logic that the debates of 1991 made explicit. The strategic highway network and the connectors serving military installations and ports were the roads on which the country’s defense mobilization would move, and their inclusion in the federally designated system reflected a judgment that national security remained a federal transportation interest even after the Interstate construction mission ended. That judgment gave the NHS a constituency beyond the highway community and helped carry the designation through the political fights of the mid 1990s. The federal matching share for NHS projects was generally eighty percent, a deliberate step down from the ninety percent that had built the Interstates. That step down was itself a statement: the era of Washington paying nearly the whole cost of favored construction was ending, and states would have a larger stake in the system’s future.

What distinguished the National Highway System from the Interstate?

The Interstate was one federally defined network built to uniform standards at a ninety percent federal share. The National Highway System was a broader designation layered over the Interstate and extended to additional arterials, funded by a new apportioned program. The shift ran from completing one network to maintaining a larger system of national significance.

The Interstate maintenance program was the statute’s answer to the question of preservation. Section 1007 rewrote section 119 of title 23 to create a dedicated program for preserving the Interstate System the country had just finished building. The logic was straightforward: a 44,000 mile system of high speed pavement represented an enormous public asset, and an asset of that size requires systematic preservation or it deteriorates. The maintenance program funded resurfacing, restoration, rehabilitation, and reconstruction of Interstate routes, shifting the federal emphasis from completing the system to keeping it serviceable. It replaced the old Interstate resurfacing, restoration, rehabilitation, and reconstruction program, known as 4R. The change of name marked a change of philosophy. The 4R program had been organized around categories of construction like work on aging segments. The maintenance program was organized around the ongoing task of keeping the completed system in serviceable condition. The statute thus converted the largest single achievement of the old era, the Interstate itself, from a construction project into a maintenance responsibility, and it funded that responsibility as a permanent program rather than a winding down account.

The Surface Transportation Program was the statute’s most inventive creation and the provision that most directly expressed the intermodal theory. Section 1008 created the STP in section 133 of title 23, consolidating a tangle of older categorical programs, including the old Federal Aid Primary and Secondary systems and the urban programs, into a single flexible block of apportioned funds. The consolidation mattered because the old categories had locked money to particular road types and particular jurisdictions. The STP unlocked it. Funds could be used on any federal aid highway, on bridges, on transit capital projects, and on a wide range of other eligible activities, and the statute built suballocation rules to push decision making outward.

The eligibility provisions of the STP were the legal engine of flexibility. Section 133(b) listed the activities STP funds could support, and the list was deliberately multimodal. Highway and bridge work on federal aid routes was eligible, as expected. But so were capital costs of transit projects eligible under the federal transit laws, carpool and vanpool programs, bicycle and pedestrian facilities, and planning activities. The breadth of the eligibility list meant that a state or metropolitan region receiving STP funds faced a genuine choice about modes, not merely a choice among highway projects. That choice was the point. The drafters wanted the apportionment to arrive without a modal answer attached, so that the planning process the statute created elsewhere in the Act could supply the answer region by region.

The suballocation structure deserves careful attention because it is where the statute’s decentralizing impulse becomes concrete. From each state’s STP apportionment, the statute reserved ten percent for safety programs, divided between railway highway crossing improvements and hazard elimination work, and ten percent for transportation enhancements. The remaining funds were divided by the statute’s geographic formula: a share suballocated to urbanized areas over 200,000 population for obligation within those areas, a share for other urban and rural areas, and a share available for use anywhere in the state. The exact division lived in 23 U.S.C. 133(d), and its effect was to guarantee that large metropolitan areas, smaller communities, and the state as a whole each had STP money that could not be captured by the others. The suballocation scheme was the fiscal expression of the statute’s federalism bargain: enough money directed to metropolitan areas to make the MPOs’ new authority real, enough retained at the state level to keep state transportation departments invested in the system. For the mechanics of apportionment and obligation that underlie these programs, the companion profile of federal highway funding mechanics walks through the formulas in detail.

The matching shares for the STP and the other title I programs reflected the negotiation between the administration’s desire for higher state contributions and the states’ recession driven resistance. The standard federal share for STP projects was 80 percent, with higher shares available for certain safety and Interstate related work. The 80 percent figure represented a retreat from the 90 percent Interstate construction share that had defined the old era, and it embodied the statute’s premise that the federal role was shifting from building the system to supporting state and regional stewardship of it. The Senate’s earlier effort to set reimbursement at 80 percent for maintenance and 75 percent for new construction, eliminating the financial incentive to build new rather than maintain, did not survive in that exact form, but the direction of the compromise was the same: maintenance and flexible use were to be at least as attractive as new construction.

Closing out Interstate construction

The statute’s farewell to Interstate construction was written with unusual legal precision. Title I declared that the authorizations of appropriations and apportionments for construction of the Dwight D. Eisenhower National System of Interstate and Defense Highways made by the Act were the final authorizations of appropriations and apportionments for completion of construction of the Interstate System. The word final did real work. It told the states, the Federal Highway Administration, and the appropriators that the construction account was closing and would not be reopened, and it converted every remaining construction dollar into a wasting asset to be spent on finishing rather than starting.

The mechanics of the closeout were specific. The Act directed the Secretary of Transportation to apportion to all states other than Massachusetts, for fiscal 1993, the sums authorized for that year by the Federal-Aid Highway Act of 1956 for expenditure on the Interstate System, based on the apportionment factors contained in Committee Print 102-24 of the House Committee on Public Works and Transportation. It extended specified Interstate apportionments through fiscal 1996. The Massachusetts carve out reflected that state’s distinctive Interstate financing situation, and the reliance on a committee print for apportionment factors showed how deeply the closeout depended on technical work done outside the statute text. The closeout did not mean construction stopped the day the President signed. It meant the pipeline had an end date, and the Interstate Maintenance program stood ready to receive the completed system as its permanent charge.

The obligation ceiling

Beneath the authorization totals lay a control mechanism that determined how much money actually moved each year: the obligation ceiling, or obligation limitation. An authorization sets the maximum that may be appropriated and apportioned. The obligation ceiling sets the maximum that states may actually obligate in a fiscal year, and Congress set it annually. ISTEA’s title I set forth obligation ceilings for the federal aid highway and highway safety construction programs for fiscal 1992 through fiscal 1997, with exceptions, and provided for the distribution of, limitation on, and redistribution of obligation authority. The Congressional Research Service summary of the conference report records these provisions as central features of the title.

The distinction between authorization and obligation authority is the key to reading every federal transportation funding debate of the period. A state could hold apportioned funds it was not permitted to obligate because the ceiling bound it, and unused obligation authority could be redistributed to states able to use it. The ceiling thus functioned as Congress’s annual throttle on the program, responsive to budget conditions in a way the six year authorization was not. During the recession that framed ISTEA’s passage, the ceiling was also the mechanism through which larger fiscal policy reached the highway program: raising or lowering the limitation changed the flow of federal construction dollars into state economies without amending the authorization. The statute’s careful treatment of distribution, limitation, and redistribution reflected hard experience with what happened when apportioned funds sat idle while needs went unmet.

Demonstration projects

Title I also carried the demonstration projects, and they deserve a direct account because they embodied the oldest tradition in highway legislation: Congress naming the projects it wanted built. The House bill had carried a large number of designated projects, expressing the chamber’s traditional view that named projects were a legitimate exercise of congressional priorities. The Senate bill, in keeping with the upper chamber’s preference for formulas over earmarks, had carried far fewer. The conference split the difference, and the enacted number reflected the compromise. The Senate acquiesced to the House’s project provisions and added projects of its own, while the two sides negotiated the treatment of the projects under the obligation limitations that appropriations legislation imposed on highway spending.

The projects’ defenders called them expressions of congressional priorities, and the description was not merely rhetorical. A designated project guaranteed that a specific community’s need, a bridge, an interchange, a corridor improvement, would be addressed regardless of how the formula apportionments fell. The projects’ detractors called them pork barrel distortions of rational policy, and that description was not merely rhetorical either. Named projects bypassed the planning processes, the MPO selections, and the fiscal constraint requirements that the statute imposed on everything else, which meant they operated outside the very reforms the law celebrated. The tension was never resolved. It was managed, project by project and conference by conference, and the demonstration projects remained the part of ISTEA that least resembled the intermodal, planning driven statute the law claimed to be.

Why did a reform statute keep demonstration projects?

Because the reformers needed the project supporters’ votes. The intermodal and planning provisions could not pass without members whose support was secured through named projects in their districts. The conference cut the earmark load to answer the veto threat without eliminating the practice, preserving both the reform architecture and the member-driven project system in one enrolled bill.

Taken together, the programs of this first movement trace a coherent design. The NHS program preserved a federal interest in roads of national significance. The Interstate Maintenance program converted the completed Interstate into a permanent preservation responsibility. The STP dissolved the old categorical structure and replaced it with flexible funds whose modal destination would be decided through planning. The design assumed that the country knew how to build highways and needed to learn how to choose among transportation investments. The rest of the statute built the institutions for making those choices.

Part Six: The Provisions, Second Movement

The Congestion Mitigation and Air Quality Improvement program, universally known as CMAQ, was ISTEA’s most direct link between transportation spending and environmental law, and it was a new creation of the statute. Section 1009 created it in section 149 of title 23, directing federal funds to projects in areas that failed to meet federal air quality standards, with the explicit purpose of reducing congestion and improving air quality. The program embodied the bargain at the heart of the 1991 settlement: the environmental community accepted a large highway authorization, and the highway community accepted a program whose dollars could only be spent in ways that cleaned the air.

Eligibility under CMAQ as enacted was narrow and precise, and precision matters here because later laws broadened the program in ways that are sometimes misremembered as original. As ISTEA wrote it, CMAQ funds were available for projects in ozone and carbon monoxide nonattainment areas only. Particulate matter nonattainment areas were not eligible as enacted, and maintenance areas, regions that had achieved the standards and were maintaining them, were not eligible either. Eligibility for particulate matter and maintenance areas arrived later, with the 1998 successor law. The enacted scope reflected the air quality politics of 1991: ozone and carbon monoxide were the pollutants most directly tied to motor vehicle emissions, and the program was aimed squarely at the transportation sources of those pollutants.

The apportionment formula translated air quality geography into dollars. Funds were apportioned to the states based on each state’s share of the nation’s weighted nonattainment area population, with the weighting rising according to the severity of the area’s classification. An ozone nonattainment area classified as severe counted more heavily than one classified as marginal, and carbon monoxide areas carried their own weights. The formula thus directed money toward the regions with the worst air, measured by the population exposed to it, rather than spreading it evenly or tying it to highway use. A minimum apportionment guaranteed that states with small nonattainment populations still received a base share. The eligible project list was correspondingly broad within its purpose: transit improvements, traffic flow improvements, bicycle and pedestrian facilities, and other projects that the statute and implementing guidance recognized as reducing emissions or congestion in the covered areas.

CMAQ in practice

In its early years, the CMAQ program funded the project types its statutory purpose implied: transit service improvements and fare programs that drew riders out of single occupant vehicles, traffic flow improvements such as signal coordination that reduced idling and stop and go emissions, bicycle and pedestrian facilities that substituted for short motor vehicle trips, and ridesharing and demand management programs. The implementing guidance from the Federal Highway Administration and the Federal Transit Administration elaborated the eligible categories, and states with large nonattainment populations, led by California, Texas, and the northeastern states, received the largest apportionments under the weighted population formula.

The narrow eligibility as enacted shaped the program’s politics. Because only ozone and carbon monoxide nonattainment areas generated apportionments, states without such areas received only the minimum share, and their congressional delegations had limited stake in the program’s growth. The severity weighting meant that within the eligible states, money concentrated in the regions with the worst classifications, which were also the regions where the conformity mechanism bit hardest. CMAQ and conformity thus worked as a pair: the conformity rule constrained what nonattainment regions could build with highway money, and CMAQ supplied money for the kinds of projects that helped them meet the constraint. The pairing was deliberate, and it is one of the clearest examples of the statute designing programs to reinforce each other rather than merely coexist.

The planning rewrite was the statute’s institutional centerpiece, and it requires the most careful exposition in this profile because it is the mechanism through which the authority shift actually operated. Section 1016 rewrote 23 U.S.C. 134, governing metropolitan transportation planning, and 23 U.S.C. 135, governing statewide planning, replacing the thin planning requirements of the old era with a detailed procedural code. The rewrite did not create metropolitan planning organizations. That is one of the statute’s most persistent myths, and the record is clear: the Federal-Aid Highway Act of 1962, Public Law 87-866, required the continuing, cooperative, and comprehensive planning process, the 3C process, for urbanized areas after July 1, 1965, and MPOs had existed since then as the designated bodies carrying out that process. What ISTEA did was vastly expand what MPOs could do and, crucially, what they could decide.

The rewritten section 134 required each MPO to produce two principal documents: a long range transportation plan covering at least twenty years, and a transportation improvement program, the TIP, listing the projects to be carried out in the near term. The plan had to consider fifteen planning factors spelled out in the statute, ranging from preservation of existing facilities through mobility for the movement of people and goods, energy conservation, and the effects of transportation on land use. The TIP had to be consistent with the plan, and both had to be developed through a process that included public involvement, coordination with transit operators, and consultation with state and local officials. The financial dimension was new in its rigor: the statute required financial plans demonstrating that the plan and the TIP could actually be implemented with reasonably available revenues, a requirement the implementing regulations developed into the fiscal constraint discipline that has governed metropolitan planning ever since.

The transportation management area provisions were the sharp edge of the rewrite. An urbanized area with a population over 200,000 was designated a TMA, and within a TMA the statute transferred project selection authority from the state to the MPO. The rule: within a TMA, the MPO selects federally funded projects from the TIP in consultation with the state and any affected public transportation operator, as provided in 23 U.S.C. 134. For projects on the National Highway System, bridge projects, and Interstate maintenance projects within a TMA, the selection rule was shared: the state selected those projects in cooperation with the MPO. The distinction reflected a judgment that the largest metropolitan regions had the institutional capacity to choose their own transportation investments, while the state retained a coordinating role for the facilities of national and statewide significance running through them. The MPOs were also made subject to federal certification review, a periodic federal check on whether the planning process met the statutory requirements, which gave Washington an oversight tool matched to the new decentralization.

Who selects projects inside a transportation management area?

Inside a transportation management area, the metropolitan planning organization selects federally funded projects from the transportation improvement program, consulting the state and any affected public transit operator. For National Highway System, bridge, and Interstate maintenance projects in the same area, the state selects in cooperation with the MPO.

The statewide planning section, 23 U.S.C. 135, imposed parallel disciplines on the states: a statewide long range plan, a statewide transportation improvement program, coordination with metropolitan planning, and consultation with local officials in nonmetropolitan areas. The statewide provisions answered the concern that the metropolitan empowerment would leave rural areas without a voice. The statute required the state planning process to reach beyond the MPO boundaries, and the STP suballocation for non urbanized areas gave that requirement financial substance.

The rewritten section 134 required the metropolitan process to consider the planning factors that stated what good transportation planning considered. The list ranged across preservation of existing facilities and the efficient use of what had already been built, the relief of existing congestion and the prevention of congestion where it had not yet appeared, and the consistency of transportation decisions with land use and development plans. It addressed the economic vitality of the metropolitan area and the efficient movement of people and goods, the connectivity of the system across modes, and access to ports, airports, intermodal facilities, and major freight routes. It required attention to energy conservation, to the social, economic, and environmental effects of transportation decisions, and to the expansion and enhancement of transit service. It called for preservation of rights of way for future projects, the use of life cycle costs in design, and the programming of expenditures on transportation enhancements. The factors did not dictate outcomes. No factor told a region to build rail instead of highways or vice versa. Their function was to force the planning process to ask questions the old highway planning process had never been required to ask, and to create a record that federal certification reviewers could examine. A plan that ignored land use effects or energy consequences was not merely a narrow plan. It was a plan vulnerable on review.

The flexibility and transfer provisions were the third element of the second movement, and they are the provisions most often summarized loosely, so they deserve statutory precision. The statute created three distinct mechanisms for moving money across the old boundaries, and each had its own section and its own logic. First, STP funds were made directly usable for transit capital costs eligible under the federal transit laws, then codified at 49 U.S.C. chapter 53, through 23 U.S.C. 133(b)(2). This was the simplest form of flexibility: no transfer required, the STP apportionment itself could pay for transit capital. Second, the statute authorized direct transfers between highway and transit programs in both directions, highway to transit and transit to highway, through 23 U.S.C. 104(f). This was the provision that let a state move apportioned highway funds into the transit program or, symmetrically, move transit funds into highway use, subject to the statutory conditions. Third, the statute authorized program to program transfers within the highway programs, the most used of which allowed a state to transfer up to 50 percent of its NHS apportionment to the STP, rising to 100 percent with the approval of the Secretary of Transportation. A state that moved funds under section 104(f) notified the Department, and the transferred funds took on the eligibility and matching rules of the receiving program. A highway to transit transfer thus produced transit money governed by transit rules, not highway money spent on transit, a distinction with consequences for project development and oversight.

The transfer record shows how the mechanisms worked in practice. The General Accounting Office found that states transferred 3.4 billion dollars among programs in fiscal years 1992 through 1997, using the program to program authorities. It demonstrates that the flexibility provisions were not decorative. States used them at scale, moving billions across program lines in the first six years. The direction and pattern of those transfers varied by state, which was precisely the point: the statute had replaced a uniform federal allocation of modal priorities with fifty state level decisions and hundreds of metropolitan decisions, and the aggregate transfer figure measures the volume of that decentralization. The highway to transit transfers under the first two mechanisms were smaller in dollar terms than the program to program highway transfers, a fact that becomes central to the counter reading in Part Eleven.

What made ISTEA flexibility different from earlier transfer rules?

Earlier law allowed narrow, conditional transfers hedged with findings that made them cumbersome. ISTEA normalized the movement of money: STP dollars could go directly to transit capital with no transfer paperwork, section 104(f) authorized two-way highway-transit transfers, and program-to-program rules worked as straightforward percentages. The concept was not new. Making it ordinary was.

Part Seven: The Provisions, Third Movement

The transportation enhancements set aside was the most symbolically charged ten percent in the history of the federal aid highway program, and it requires the full enumeration the statute gave it, because the categories are frequently misremembered. Section 133(d)(2) of title 23, as written by ISTEA, reserved ten percent of each state’s Surface Transportation Program apportionment for transportation enhancements, and it named exactly ten categories of eligible activity. The categories, in the statute’s terms, were facilities for pedestrians and bicycles, and safety and educational activities for pedestrians and bicyclists, which together recognized walking and cycling as transportation rather than recreation. The next group reached into the landscape and the past: acquisition of scenic easements and scenic or historic sites, scenic or historic highway programs including tourist and welcome center facilities, landscaping and other scenic beautification, and historic preservation as a standalone category. The statute then named the rehabilitation and operation of historic transportation buildings, structures, or facilities, expressly including historic railroad facilities and canals, and the preservation of abandoned railway corridors, expressly including their conversion and use for pedestrian or bicycle trails, which gave legal standing to the rails to trails movement that had been converting disused rail lines into public paths. The final categories were the control and removal of outdoor advertising, a descendant of the Highway Beautification Act’s concern with billboards, and archaeological planning and research.

Two things must be said about that list with emphasis, because the record is precise and the folklore is not. The ten categories above are the ISTEA categories, no more and no fewer. Later legislation added further categories, notably mitigation of water pollution due to highway runoff and reduction of vehicle caused wildlife mortality, and transportation museums, which were added by the 1998 successor law and are sometimes attributed to ISTEA by writers who have not checked the enrolled text. They are not ISTEA categories. The distinction matters for the same reason the whole enumeration matters: the enhancements program was a defined statutory list, and understanding what Congress actually authorized in 1991 is the precondition for understanding what later Congresses changed.

The set aside worked by reservation rather than by separate apportionment. Ten percent of STP dollars never reached the general STP pool; they were dedicated to enhancement projects from the start. That design choice was the product of a specific political judgment: the sponsors of enhancements believed, with reason, that bicycle paths and historic depots would lose every fair fight for dollars against highway preservation and capacity projects, and that only a dedicated reservation would let the projects happen. The critics of enhancements believed, also with reason, that the reservation took money from core transportation purposes. The argument between those positions ran through the entire ISTEA authorization period and into every subsequent reauthorization. The set aside’s legislative parentage ran through the scenic and trail movements of the 1980s. The rails to trails movement had been converting abandoned rail corridors to pedestrian and bicycle paths for a decade, and its supporters had learned that trail projects lost consistently when forced to compete against highway projects for discretionary dollars. The ten categories Congress enacted wove those movements’ agendas into the statute. The set aside was a coalition assembled category by category, and each category’s supporters defended the whole reservation because each needed the others’ votes.

The political meaning of the set aside exceeded its dollars. Ten percent of the STP was a modest share of total federal transportation spending, but the provision announced that federal transportation money could pay for sidewalks, bike lanes, historic depots, and archaeological surveys. Highway organizations, led by the American Association of State Highway and Transportation Officials, argued during the reauthorization debates that followed that the set aside diverted user fee revenues from the highway purposes for which the trust fund had been created. Environmental and community organizations, organized through the Surface Transportation Policy Project and allied groups, argued that the categories recognized the full range of what transportation investment should serve. The statute sided with the broader definition, and the fight over whether that choice was legitimate continued through every subsequent reauthorization.

Why did the enhancements set-aside survive its critics?

The reservation had three defenses. Ten percent of one program was small enough that opponents could never quite make the waste case stick. The projects produced visible local results that built local constituencies. And the categories were defined in statute, which made the reservation harder to caricature than a discretionary grant program. Critics kept their arguments. The constituency kept growing.

The transit titles rewrote the federal transit program and renamed its agency. Title III of ISTEA, the Federal Transit Act Amendments of 1991, reauthorized the federal transit program that had originated with the Urban Mass Transportation Act of 1964 and extended through the surface transportation assistance acts of the 1970s and 1980s. It authorized the formula grant programs for urbanized and non urbanized areas, the discretionary capital programs including the new starts program for fixed guideway projects, and the planning assistance that funded the transit side of the metropolitan planning process. The 32 billion dollar transit authorization, nearly double what the administration had requested on the Research Service’s accounting, was the transit community’s largest legislative victory in a generation, and it came paired with the flexibility provisions that let highway dollars supplement it. The symbolic act was the renaming: section 3004(c)(3) of the Act substituted Federal Transit Administration for Urban Mass Transportation Administration in the United States Code, as the editorial notes to 49 U.S.C. 101 record. The old name had described a clientele, urban mass transportation. The new name described a function, transit, and it matched the statute’s premise that transit was a mode within an intermodal system rather than a separate federal charity.

The transit title’s relationship to the highway title was the institutional expression of intermodalism. The same metropolitan planning organizations that selected highway projects from the TIP programmed transit projects. The same conformity determinations covered transit investments. The transfer authorities let the two titles function as communicating vessels rather than sealed compartments. The Mass Transit Account of the Highway Trust Fund financed the transit title, and both accounts drew on dedicated user taxes, with the flexibility provisions allowing movement between the programs the accounts funded. For transit agencies in the large metropolitan areas, ISTEA’s planning and flexibility provisions mattered as much as the authorization totals, because they gave transit a structural position in regional decision making that no authorization figure alone could provide.

The revenue title, the Surface Transportation Revenue Act of 1991, extended the Highway Trust Fund taxes that financed the authorization, including the motor fuel taxes whose rates had been set by the Omnibus Budget Reconciliation Act of 1990. The Ways and Means Committee’s jurisdiction over the title is the reason H. Rept. 102-171 ran to two parts, and the revenue provisions are the reason the statute could authorize six years of spending with a credible claim of fiscal support. The trust fund structure survived ISTEA intact: highway account and transit account, fed by dedicated excise taxes, with the transit account continuing to receive its share of the fuel tax. The flexibility provisions moved money between programs, but they did not merge the accounts, and the distinction between the highway and transit accounts remained the fiscal skeleton of the federal program. Title VIII did not raise the tax rates. The statute’s fiscal achievement was authorization and extension, not taxation.

The safety titles carried forward and extended the federal highway safety enterprise. The Highway Safety Act of 1991 reauthorized the state and community highway safety grant program under 23 U.S.C. 402 and the related behavioral safety programs administered with the National Highway Traffic Safety Administration, whose own authorization traveled under the National Highway Traffic Safety Administration Authorization Act of 1991. The section 402 program was the behavioral counterpart to the engineering work funded under title I: where the highway programs built safer roads, the safety grants funded the enforcement and education that made the roads safer to use. The Motor Carrier Act of 1991 addressed commercial vehicle safety, continuing the federal state partnership in truck and bus safety regulation and enforcement and requiring state enforcement plans to provide maximum reciprocity for inspections under the North American Inspection Standard. These titles extended and refined existing authorities rather than reinventing them, and their presence testified to the breadth of the coalition: the safety community got its titles renewed without controversy while the structural fights raged in Title I.

Safety programs in operation

The safety titles of ISTEA are often summarized in a sentence, but their operation repays a longer look because they show the statute’s federal state partnership working in its most traditional form. The Highway Safety Act of 1991 reauthorized the state and community highway safety grant program under 23 U.S.C. 402, through which the National Highway Traffic Safety Administration funded state programs in occupant protection, impaired driving countermeasures, speed enforcement, emergency medical services, and traffic records. The section 402 program was the behavioral counterpart to the engineering work funded under title I: where the highway programs built safer roads, the safety grants funded the enforcement and education that made the roads safer to use. The states submitted annual highway safety plans, and the federal grants, matched by state funds, supported the activities the plans identified.

The Motor Carrier Act of 1991 continued the federal state partnership in commercial vehicle safety, funding state enforcement of truck and bus safety regulations, roadside inspections, and compliance reviews. The motor carrier provisions reflected the reality that the Interstate System ISTEA was closing out had become the primary workplace of the interstate trucking industry, and that the safety of that workplace depended on inspection and enforcement regimes the states administered with federal support. The ten percent STP safety set aside connected the safety enterprise to the flexible program structure. Half of the set aside addressed railway highway grade crossings and half addressed hazard elimination on the roadways, continuing programs that predated ISTEA but giving them a dedicated claim on the new flexible funds. The set aside’s structure illustrated the statute’s characteristic method: a flexible block grant with fenced portions for the purposes Congress was unwilling to leave entirely to state and regional discretion. Safety, like enhancements, got its fence. The difference was that no one fought over the safety fence the way they fought over the enhancements fence, which tells the historian something about which federal purposes commanded consensus in 1991 and which did not.

The research titles pointed at the future. The Intelligent Vehicle-Highway Systems Act of 1991 authorized a federal program for what would later be called intelligent transportation systems: the application of communications, computing, and sensing technology to vehicles and roadways, from electronic toll collection to advanced traffic management. The program funded research, operational tests, and early deployment. Title V of the Act created the Bureau of Transportation Statistics, established in 1992, giving the Department a dedicated statistical agency for transportation data. The Symms National Recreational Trails Act of 1991, named for Senator Steve Symms of Idaho, one of Moynihan’s original cosponsors on the Senate bill, created the national recreational trails funding program. Research, statistics, and trails were the statute’s acknowledgment that transportation policy needed knowledge infrastructure as well as physical infrastructure, and the Bureau’s creation in particular reflected the drafters’ belief that better decisions required better data. The Metropolitan Washington Airports Act Amendments of 1991 addressed the governance of the region’s airports, a provision with a narrow geographic footprint but a significant institutional precedent.

Part Eight: The Conformity Mechanism

The conformity mechanism is the provision that gave ISTEA its teeth in metropolitan regions with dirty air, and it is also the provision most often described inexactly. The mechanism did not originate in ISTEA. It originated in the Clean Air Act Amendments of 1990, which added section 176(c) to the Clean Air Act, codified at 42 U.S.C. 7506(c). That section provides that no department, agency, or instrumentality of the federal government shall engage in, support in any way, or provide financial assistance for, license or permit, or approve any activity which does not conform to an approved state implementation plan. The Department of Transportation, the Federal Highway Administration, and the Federal Transit Administration are federal agencies within the meaning of that prohibition. ISTEA’s contribution was to rewrite the transportation planning statutes, 23 U.S.C. 134 and 135, so that the approval of metropolitan and statewide plans and transportation improvement programs operated inside the conformity framework the Clean Air Act had created. For the air quality classifications that drive the mechanism, the profile of Clean Air Act standards explains nonattainment designations in full.

The mechanism works through a sequence of determinations, and the sequence is worth following step by step because each step assigns responsibility to a different actor. The starting point is the state implementation plan, the SIP, which is the state’s federally approved strategy for attaining the national ambient air quality standards. For transportation sources, the SIP contains motor vehicle emissions budgets, quantitative ceilings on the emissions that cars, trucks, and buses may produce in a nonattainment or maintenance area. The metropolitan planning organization then performs a conformity determination for its long range plan and its transportation improvement program. The determination is a technical demonstration, built on travel demand modeling and emissions modeling, showing that the projected emissions from the planned transportation system will remain within the SIP’s motor vehicle emissions budgets over the planning horizon. The Federal Highway Administration and the Federal Transit Administration then review the MPO’s determination and issue a conformity finding. Without that federal finding, the plan and the TIP cannot be approved, and without an approved conforming plan and TIP, federal transportation funds cannot flow to non exempt projects in the area.

The consequence of a failed or lapsed conformity determination is the lapse, and the lapse is where the mechanism’s bite becomes concrete. When conformity lapses, when the MPO cannot demonstrate that its plan and TIP stay within the emissions budgets, or when the federal agencies cannot issue a positive finding, the region enters a state in which only exempt projects may proceed to federal approval. Exempt projects are defined by regulation and include safety work, transit operations, bicycle and pedestrian facilities, and other project types deemed to have neutral or beneficial air quality effects. New highway capacity projects, the projects most likely to increase vehicle emissions, cannot advance. The lapse does not stop all transportation spending in a region, but it stops the spending that would worsen the air, and it does so automatically, through the interaction of the two statutes, without requiring any official to make a discretionary judgment about a particular project.

What happens when a plan cannot demonstrate conformity?

When a metropolitan planning organization cannot show that its plan and improvement program stay within the state air quality plan’s motor vehicle emissions budgets, federal conformity lapses. Only exempt projects, such as safety work and transit operations, may then advance to federal approval. New highway capacity projects stop until conformity is restored.

Two distinctions keep the mechanism clear. First, conformity is not the same as the environmental review required by the National Environmental Policy Act. NEPA review, with its environmental impact statements, examines the effects of individual projects and considers alternatives; the environmental review process under NEPA applies project by project. Conformity examines the transportation system as a whole, plan and program level, against the emissions budgets. A project can survive NEPA review and still be blocked by a conformity lapse, and a conforming plan can contain projects that still face difficult NEPA reviews. Second, conformity is not a planning aspiration. It is a legal condition on federal approval and funding, which is why the planning rewrite mattered as much as the Clean Air Act Amendments themselves. The 1990 amendments wrote the budgets. ISTEA wrote the machinery that made the budgets constrain transportation plans.

The planning rewrite and the conformity requirement reinforced each other in ways the drafters intended. ISTEA required the long range plan to extend at least twenty years and the TIP to be consistent with the plan, and it required both to be financially constrained. The conformity determination applied to both documents, which meant that a region could not satisfy the planning statute with an unconstrained wish list and could not satisfy the Clean Air Act with a conforming TIP disconnected from a conforming plan. The fifteen planning factors in 23 U.S.C. 134(f) included factors addressing energy conservation and air quality, so the substantive planning considerations pointed in the same direction as the conformity test. The federal certification reviews of TMA planning processes gave the Federal Highway Administration and the Federal Transit Administration a periodic opportunity to check that the whole apparatus, planning plus conformity, was functioning.

The implementing regulations that made the mechanism operational arrived after the statute. The Environmental Protection Agency issued the transportation conformity rule in November 1993, establishing the criteria and procedures for conformity determinations, and the Department of Transportation issued the metropolitan planning regulations the same year, operationalizing the section 134 rewrite. The two rulemakings had to be consistent with each other, since the planning process produced the documents the conformity process judged, and the interagency consultation procedures built into both rules created a standing forum in which transportation and air quality officials reconciled their analyses. The conformity rule required the MPO, the state transportation department, the state air quality agency, the Environmental Protection Agency, and the federal transportation agencies to consult on the assumptions, models, and methods behind each conformity determination. The consultation requirement forced the transportation planners and the air quality planners, two professional communities that had historically worked in isolation, to build a common analytical practice.

This profile describes the conformity mechanism by its statutory operation, without normative gloss, because the mechanism is best understood as a legal machine with defined inputs and outputs. The Clean Air Act supplies the prohibition and the emissions budgets. ISTEA supplies the planning documents to which the prohibition attaches and the federal approval actions that trigger it. The MPO supplies the technical demonstration. The federal transportation agencies supply the finding. The output is binary: conformity or lapse, approval or stoppage. Whether that machine produced better air, better transportation, or better regions is a question for the measured effects part of this profile. The machine itself is a matter of statutory text, and the text is unambiguous about how it works.

Part Nine: The Authority Shift

The preceding parts have described the authority shift provision by provision. This part renders it as an artifact, a table mapping the decisions the statute moved, who held them before 1991, who holds them after, and the provision that made the change. The table is the answer to the first element of the One Test in condensed form.

The authority shift table

Decision	Who decided it before 1991	Who decides it after 1991	Provision that made the change
Project selection in large metropolitan areas	State highway departments, with federal approval of programs	The MPO, selecting federally funded projects from the TIP in consultation with the state and affected transit operators	23 U.S.C. 134, TMA provisions
Project selection for NHS, bridge, and Interstate maintenance work inside TMAs	State highway departments, with federal approval	The state, in cooperation with the MPO	23 U.S.C. 134, TMA provisions
Modal allocation of flexible funds	Statute assigned modes; highway funds were for highways	States and MPOs; STP funds directly usable for transit capital; transfers authorized both directions	23 U.S.C. 133(b)(2); 23 U.S.C. 104(f)
Movement of funds between highway programs	Rigid program categories with limited transfer authority	States; up to 50 percent of NHS apportionment to STP, up to 100 percent with Secretarial approval	ISTEA program to program transfer provisions
Air quality compliance of transportation plans	No federal planning hook linking plans to SIPs	MPO conformity determination; FHWA and FTA conformity finding required before plan and TIP approval	CAA 176(c), 42 U.S.C. 7506(c); 23 U.S.C. 134 and 135
Content of the long range plan	State highway plans oriented to construction programs	Fiscally constrained multimodal plan addressing fifteen statutory planning factors	23 U.S.C. 134
Use of 10 percent of STP funds	No dedicated enhancement category existed	Reserved for the ten statutory transportation enhancement categories	23 U.S.C. 133(d)(2)

Reading the table against the statute

The table above is an interpretive artifact, and it should be read the way its author intends: as a set of claims about statutory text that the reader can check. This section supplies the checking notes, row by row, so that the authority shift is not taken on faith. The project selection rows rest on the transportation management area provisions of 23 U.S.C. 134 as rewritten by ISTEA. The operative language gives the MPO, within a TMA, the selection of federally funded projects from the transportation improvement program, in consultation with the state and any affected public transportation operator. The companion rule for NHS, bridge, and Interstate maintenance projects in the same areas gives selection to the state in cooperation with the MPO. The pre 1991 column describes the regime under the 1956 Act structure, in which state highway departments programmed projects within federal aid systems subject to federal approval, without any regional body holding selection authority. The contrast is not a matter of emphasis. It is a transfer of a legal power from one institution to another, recorded in the Code.

The modal allocation row rests on two provisions that must be kept distinct. Section 133(b)(2) of title 23 makes STP funds directly eligible for transit capital costs eligible under the federal transit laws, which means no transfer is required for a state or region to spend its STP apportionment on transit capital. Section 104(f) of title 23 authorizes the actual transfers, highway to transit and transit to highway, moving apportioned funds between the programs. The pre 1991 column describes the categorical structure in which highway apportionments were for highways, a structure the old Federal Aid Primary, Secondary, and Urban programs enforced through their eligibility rules. The post 1991 column describes a regime in which the apportionment arrives without a fixed modal answer. The distinction between direct eligibility and transfer authority matters because the two mechanisms had different administrative paths and different political visibility, and conflating them produces the myth that ISTEA created a single undifferentiated transportation fund. It did not. It created specific channels, and money moved through those channels or not at all.

The program to program transfer row rests on the provisions allowing states to move funds among the apportioned highway programs, with the NHS to STP transfer as the leading example: up to 50 percent on the state’s own authority, up to 100 percent with the Secretary’s approval. The pre 1991 column describes the rigid program categories that made such movement difficult or impossible. The post 1991 column describes a regime the General Accounting Office measured at 3.4 billion dollars in transfers in fiscal 1992 through 1997. The figure is the empirical check on the row: the authority was not theoretical, and the states used it at scale. The variation among states in how much they transferred is the further check on what the authority meant. It meant different states made different choices, which is what a decentralization provision is supposed to produce.

The air quality row rests on the interaction the conformity part of this profile explained at length: Clean Air Act section 176(c) supplying the prohibition, ISTEA’s sections 134 and 135 supplying the planning documents and the federal approval actions to which the prohibition attaches, the MPO supplying the conformity determination against the state implementation plan’s motor vehicle emissions budgets, and the Federal Highway Administration and Federal Transit Administration supplying the conformity finding. The pre 1991 column describes the world before the 1990 Clean Air Act amendments, in which no federal planning hook linked transportation plans to air quality plans. The post 1991 column describes the lapse mechanism, in which only exempt projects advance until conformity is restored. The row’s provision column names both statutes deliberately, because attributing the mechanism to either statute alone misstates how it works.

Three features of the table deserve emphasis. First, the shift was partial and carefully bounded. The statute did not abolish the state transportation departments or hand metropolitan bodies a blank check. For the largest and most nationally significant project categories, NHS, bridges, Interstate maintenance, the state retained the selecting role, with the MPO in a cooperation role rather than a selection role. The MPO’s selection authority covered the federally funded projects drawn from the TIP in transportation management areas, the urbanized areas over 200,000 in population defined in 23 CFR 450.104. That boundary, TMA versus non TMA, state selected versus MPO selected, is where the federalism compromise of 1991 lives in the text.

Second, the shift was procedural rather than fiscal. Congress did not move the money to the MPOs. The apportionments still flowed to the states, and the obligation authority still ran through the state transportation departments and the federal aid machinery. What moved was the decision about which projects the money would fund, and the constraints under which that decision would be made. A reader who looks for the metropolitan turn in the funding tables will miss it. It is in the planning sections.

Third, the conformity row is the enforcement mechanism for the entire shift. The MPO’s new selection authority would have meant little if the plans it produced faced no binding constraint, because an unconstrained MPO could simply have replicated the state highway department’s project list. Conformity supplied the constraint. The emissions budgets in the state implementation plans gave the MPO’s decisions a legal shape they had never possessed, and gave the federal approval process a substantive test it had never applied. Authority without constraint is delegation. Authority with constraint is governance. ISTEA built the second.

The cooperation requirement deserves emphasis because it is the most easily overlooked feature of the design. The statute did not simply divide decisions between MPOs and states. It required them to work together on the plans and programs that framed those decisions, and it made the federal approval of those documents contingent on the cooperation having occurred. A state that ignored its MPOs risked its plan. An MPO that ignored its state risked its program. The mutual dependence was deliberate, and it prevented the authority shift from becoming a simple transfer of dominance from one level of government to another. Power moved, but it moved into a shared structure rather than into new hands alone.

Part Ten: Implementation

Implementation began the day after signature, and the first years were dominated by rulemaking. The Department of Transportation issued the metropolitan planning regulations in 1993, translating the rewritten 23 U.S.C. 134 and 135 into operational requirements for plans, improvement programs, public involvement, financial constraint, and the federal certification reviews of transportation management areas. The Environmental Protection Agency issued the transportation conformity rule in November 1993, setting the criteria and procedures for the determinations the MPOs had to produce. The two rulemakings together defined what compliance looked like, and the regions spent the mid 1990s building the modeling capacity, the interagency consultation routines, and the documentation practices the rules demanded. For regions that had treated planning as a paperwork exercise under the old 3C process, the new requirements were a genuine shock to institutional routines.

The National Highway System designation moved on a separate track. ISTEA had directed the Secretary to designate the system and created the program to fund it, and Congress completed the formal designation in 1995, within the statute’s framework of the 155,000 mile cap with its fifteen percent tolerance. In the interim, the NHS program operated on the basis of the statutory direction and the administration’s earlier illustrative system work, and the apportionments flowed to the states under the new program structure. The Interstate Maintenance program stood up more quickly, since it succeeded the existing 4R program and the states already had the project pipelines and the administrative machinery. The Surface Transportation Program required the states to learn the suballocation rules and the new eligibility provisions, and the early years saw considerable variation in how aggressively states used the flexibility the statute offered.

The transfer record, measured by the General Accounting Office at 3.4 billion dollars moved among programs in fiscal years 1992 through 1997, shows a program structure being used as designed at the program to program level. States shifted NHS funds to the STP, moved funds among the apportioned programs, and exercised the Secretarial approval route for larger transfers. The highway to transit transfers under 23 U.S.C. 133(b)(2) and 104(f) were real but smaller, and their pattern was uneven across states. Some states, with strong transit agencies and supportive governors, moved significant highway dollars into transit capital. Others moved little or nothing, leaving the flexibility provisions largely unused. The unevenness was not a malfunction. It was the statute working as a decentralization measure: the federal government had stopped prescribing the modal answer, and different states gave different answers.

The enhancements program produced its own implementation story. The ten percent STP set aside generated a wave of pedestrian, bicycle, scenic, and historic projects that had never before had a dedicated federal funding stream, and the rails to trails conversions authorized under the abandoned corridor category became some of the most visible symbols of the statute. State implementation varied widely. Some states embraced the categories and built substantial enhancements programs. Others were slow to obligate the set aside funds, drawing criticism from the enhancement constituencies and prompting later statutory changes to the obligation rules. The variation repeated the pattern of the flexibility provisions: a federal permission structure used unevenly across fifty different political environments.

The first authorization cycle

The years from 1992 through 1997 tested whether the statute’s procedures could survive contact with fifty state governments and hundreds of metropolitan regions. The 1993 planning regulations required MPOs to produce conforming plans and improvement programs on the statute’s timetable, and many regions discovered that their modeling capacity, their data, and their interagency relationships were not equal to the task. Building a twenty year financially constrained plan with a defensible conformity determination required travel demand models, emissions models, financial forecasting, and public involvement programs that smaller MPOs had never needed. The federal certification reviews of transportation management areas became the mechanism through which Washington measured the gap between the statutory requirement and regional capacity, and the reviews generated corrective actions that reshaped planning practice region by region.

The conformity determinations were the hardest single task. Regions had to project two decades of travel, translate travel into emissions, and show the totals staying within the state implementation plan’s motor vehicle emissions budgets, all while the Environmental Protection Agency’s 1993 conformity rule and the Department of Transportation’s planning rule were still being interpreted. Interagency consultation groups, bringing together the MPO, the state air quality agency, the state transportation department, the Federal Highway Administration, the Federal Transit Administration, and the Environmental Protection Agency, became standing institutions in nonattainment regions. The consultation process was cumbersome by design: it forced transportation and air quality officials to reconcile their analyses before projects advanced, rather than litigating the discrepancies afterward.

State use of the flexibility provisions sorted the states into patterns that persisted. Some states moved aggressively, shifting NHS funds to the STP, using STP funds for transit capital, and building substantial enhancements programs. Others treated the flexibility authorities as options to be exercised sparingly, continuing to program their apportionments along traditional modal lines. The enhancements set aside was obligated slowly in many states in the early years, drawing criticism from the constituencies that had fought for the categories and prompting administrative pressure to accelerate project delivery. The variation was the decentralization working as designed, but it also meant that the statute’s national effects were the sum of fifty different state responses rather than a single federal policy outcome.

The early conformity disputes

The first conformity determinations under the new rules were among the most technically demanding exercises American metropolitan planning had ever attempted, requiring regions to model twenty years of travel and emissions and to defend the results to federal reviewers. Early conformity determinations were rough. Modeling capacity was uneven, the state implementation plans were themselves works in progress, and the first rounds of determinations produced disputes about baseline years, budgets, and the treatment of specific projects. The disputes of the early years, over baseline years, over the treatment of transportation control measures, over the modeling of specific projects, were the growing pains of a common analytical practice that transportation and air quality officials had never before been required to share. Over the authorization period the practice matured. MPOs built the technical capacity, the interagency consultation procedures regularized, and conformity became a routine, if never a simple, part of metropolitan planning. A conformity lapse, the failure of a plan or program to demonstrate conformity, froze the federal project pipeline in the affected area, and the sanction’s severity was the point. Congress had decided that the air quality constraint would be real, and a constraint that never binds is not a constraint.

Toward the 1998 successor

ISTEA expired by its own terms on September 30, 1997, and the Congressional Research Service records a single six month extension before the next authorization arrived. The reauthorization debate of 1997 and 1998 replayed the 1991 coalition’s disagreements with the added evidence of six years of implementation. Senator Moynihan opened the Senate debate by introducing the ISTEA Reauthorization Act of 1997 with thirty one cosponsors, a marked expansion from the four who had joined his original 1991 bill, and he used the Congressional Record to make the case for continuity. ISTEA, he said, had spurred the federal government and the states to invest transportation dollars in whatever modes were most efficient for moving people and goods and to solicit the input of local communities, producing what he described as a dramatic increase in investment in maintenance and rehabilitation of existing roads and bridges, in mass transit, and in creative approaches from bicycle and pedestrian paths to ferry boats.

The constituencies arrayed as they had in 1991, with positions sharpened by experience. The highway organizations pressed for a larger NHS commitment and relief from what they described as the planning and conformity burdens on highway project delivery. The transit organizations pressed for fuller use of the flexibility provisions and for funding levels that matched the intermodal rhetoric. The environmental organizations defended CMAQ, the enhancements set aside, and the conformity framework as the statute’s core achievements. The successor law, the Transportation Equity Act for the 21st Century of 1998, retained the ISTEA architecture in its essentials: the metropolitan planning process, the transportation management area project selection rule, fiscal constraint, conformity, the flexible program structure, and the enhancements and CMAQ programs all carried forward. The retention was the measure of what ISTEA had built. A procedural revolution that survives its first reauthorization has become the operating system, and every authorization since has run on the system ISTEA installed.

Part Eleven: Measured Effects, the Counter Reading, and the Myths

The measured effects of ISTEA, as assessed in the evaluations that accumulated through the late 1990s and after, support a clear central finding with an important qualification. The clear finding is procedural: the statute durably changed how transportation decisions are made in American metropolitan regions. The MPO empowerment, the planning requirements, the fiscal constraint discipline, and the conformity mechanism all survived into the successor laws, which retained them in substance through TEA-21 in 1998, SAFETEA-LU in 2005, MAP-21 in 2012, the FAST Act in 2015, and the IIJA in 2021. No subsequent Congress repealed the TMA project selection rule or the conformity framework. The procedures ISTEA created became the permanent operating system of federal surface transportation planning.

The qualification concerns dollars rather than procedures, and it is the counter reading this profile promised. The claim sometimes made for ISTEA is that it rebalanced American transportation spending toward transit and away from highways. The spending record does not support that claim in its strong form. Highway spending remained dominant through the ISTEA years and after. The flexibility provisions moved real money, and the 3.4 billion dollars in program to program transfers is evidence of genuine decentralization, but the highway to transit transfers were modest relative to total federal transportation spending, and their use was concentrated in a subset of states. The durable change was not a modal rebalancing of dollars. It was a procedural rebalancing of decisions: who chooses, under what constraints, with what public involvement, and with what air quality consequences.

Did ISTEA move money or move decisions?

ISTEA moved decisions more durably than dollars. Highway spending stayed dominant and transit transfers were modest and uneven, but the statute permanently transferred project selection to metropolitan bodies, imposed fiscal constraint and conformity on planning, and made modal choice a regional decision.

The constituencies read that record differently, and their arguments deserve presentation with equal care, anchored to the periods in which they were made. Highway organizations, speaking through the American Association of State Highway and Transportation Officials and the American Road and Transportation Builders Association during the reauthorization debate that produced the 1998 successor law, argued that the flexibility provisions and the enhancements set aside diverted Highway Trust Fund user fee revenues from the highway investment the fund had been created to support, and that the planning and conformity requirements imposed costs and delays on needed highway projects. Transit organizations, speaking through the American Public Transportation Association in the same period, argued that the flexibility provisions were underused because state departments of transportation remained highway oriented institutions, and that the transit title’s funding levels did not match the intermodal rhetoric. Environmental organizations, organized through the Surface Transportation Policy Project, argued that the planning and conformity provisions were the statute’s most important achievement and pressed for their strengthening in reauthorization. Each position had evidence. The highway groups could point to the continued dominance of highway spending as proof the program remained highway centered. The transit groups could point to the modest transfer totals as proof the flexibility was more promise than practice. The environmental groups could point to the conformity determinations as proof the statute had real force. The statute contained all three readings because the 1991 coalition had needed all three constituencies.

The myths that accumulated around ISTEA can be stated and corrected compactly. The first myth holds that ISTEA created metropolitan planning organizations. It did not. The Federal-Aid Highway Act of 1962 required the 3C planning process after July 1, 1965, and MPOs date from that requirement. ISTEA expanded their powers, most importantly through the TMA project selection rule, but the institutions predated the statute by nearly three decades. The second myth holds that ISTEA let any highway dollar be spent on any transit purpose. It did not. The statute created three specific mechanisms, direct STP eligibility for transit capital under 23 U.S.C. 133(b)(2), bidirectional transfers under 23 U.S.C. 104(f), and program to program transfers with the 50 percent NHS to STP rule and the Secretarial approval route, each with its own conditions. Money moved through those channels or not at all. The third myth holds that CMAQ as enacted covered all air pollutants and all nonattainment areas. It did not. Eligibility as enacted was ozone and carbon monoxide nonattainment areas only, with particulate matter and maintenance area eligibility arriving in later laws. The fourth myth holds that the enhancements program was a bicycle path set aside. It was not. The statute named ten categories, from historic preservation through archaeological research to outdoor advertising control, and the bicycle and pedestrian facilities were two of the ten. The fifth myth holds that ISTEA declared the Interstate finished and ended highway building. It did not. The statute declared its Interstate construction authorizations the final ones for completion, created the Interstate Maintenance program as a permanent preservation responsibility, and funded the National Highway System as the ongoing federal highway commitment.

Part Twelve: Research Guide

The researcher who wants to work from primary sources should start with the enrolled text at 105 Stat. 1914, available through the Government Publishing Office’s Statutes at Large collection and through the digitized enrolled bill file that the Eno Center for Transportation published from the George H. W. Bush Presidential Library, which includes the Office of Management and Budget summary, the Department of Transportation views letter, the signing statement, the transcript of the Euless signing ceremony, and the White House fact sheet. The conference report, H. Rept. 102-404, filed November 27, 1991, is the essential legislative history document: it explains what the conferees agreed to and, by comparing the House bill and the Senate amendment, shows what each chamber surrendered. The committee reports, H. Rept. 102-171 Parts I and II, carry the House committee’s account of the bill, and the Congressional Record for October and November 1991 carries the floor debates, including the 343 to 83 House passage vote, the voice vote Senate passage, and the 372 to 47 and 79 to 8 conference report votes.

The official studies that scored and evaluated the statute form the second layer of sources. The Congressional Research Service produced the authoritative summaries and, in later years, the vote tables and program evaluations this profile has cited, including the 151 billion dollar authorization figure and the highway transit split of roughly 119 billion against 32 billion. The General Accounting Office produced the implementation studies, including RCED-91-147 on the nearly complete Interstate System and the report finding 3.4 billion dollars in program to program transfers in fiscal years 1992 through 1997. The Federal Highway Administration published the contemporaneous program guide that described the authorization at about 155 billion dollars, and its later funding tables remain the standard reference for apportionment history. The Code of Federal Regulations carries the implementing rules at 23 CFR 450 for planning and the Environmental Protection Agency’s transportation conformity rule for the air quality mechanism.

For the statutory text as amended, the researcher should work from title 23 of the United States Code, particularly sections 104, 119, 133, 134, 135, and 149, and from title 49 for the transit provisions, reading the historical notes to trace which subsections ISTEA added or rewrote. The 1990 Clean Air Act amendments, section 176(c) at 42 U.S.C. 7506(c), must be read alongside the transportation planning sections, since the conformity mechanism lives in the interaction of the two statutes. Committee prints, particularly House Committee Print 102-24 with the Interstate apportionment factors referenced in the conference summary, reward the patient researcher with the formula level detail that summaries omit.

The study strategy this profile recommends is sequential. First, fix the citation, the dates, and the five anchors from Part Three, so that every later claim has a reference point. Second, read the conference report’s summary of title I before reading the Code sections, since the report explains the structure the Code merely implements. Third, trace one provision, such as the enhancements set aside or the TMA selection rule, from the enrolled text through the implementing regulation to a GAO evaluation, to see how statutory language becomes administrative practice. Fourth, compare the statute’s flexibility mechanisms with the transfer totals to form an independent judgment on the counter reading in Part Eleven. A useful companion for organizing that work is a legislation study notebook. For the longer arc in which ISTEA sits, from the 1956 Act through the successor authorizations, the history of infrastructure legislation places the 1991 statute in its full chronological context.

A final research caution. The successor statutes amended many of ISTEA’s provisions, and the United States Code as amended reflects those changes rather than the 1991 text. A researcher who reads section 149 of title 23 as it stands and assumes the eligibility language was enacted in 1991 will misdate the particulate matter and maintenance area provisions by seven years. The discipline is simple: for any provision, check the amendment history and confirm the 1991 language before attributing it to ISTEA. The statute repays that discipline. It was written carefully, negotiated fiercely, and implemented thoroughly, and the hinge it forms in the history of American transportation law is visible only to readers who meet the 1991 text on its own terms.

Frequently Asked Questions

Q: What did ISTEA change about transportation policy?

ISTEA replaced the Interstate construction era’s federal model with a system built around regional decision making, air quality accountability, and modal flexibility. Before the statute, federal transportation policy meant Washington funding state highway departments to build the Interstate System to federal standards. After it, metropolitan planning organizations in large urbanized areas selected federally funded projects, transportation plans had to conform to air quality plans, and highway funds could pay for transit capital through three distinct transfer mechanisms. The statute authorized six years of programs, fiscal 1992 through fiscal 1997, scored by the Congressional Research Service at 151 billion dollars. Its durable legacy was procedural rather than fiscal: the planning, conformity, and flexibility structures it created survived into every successor authorization.

Q: What is a metropolitan planning organization under ISTEA?

A metropolitan planning organization is the designated body that carries out the federally required transportation planning process for an urbanized area. Under ISTEA’s rewrite of 23 U.S.C. 134, each MPO produced a long range transportation plan covering at least twenty years and a transportation improvement program listing near term projects, developed through public involvement and coordination with transit operators and state and local officials. In transportation management areas, urbanized areas over 200,000 population, the MPO gained the authority to select federally funded projects from the TIP. MPOs were not created by ISTEA; the Federal-Aid Highway Act of 1962 required the planning process they administer. ISTEA vastly expanded their powers and made them subject to federal certification review.

Q: What is CMAQ in ISTEA?

CMAQ is the Congestion Mitigation and Air Quality Improvement program, created by ISTEA and codified at 23 U.S.C. 149. It directed federal funds to projects that reduce congestion and improve air quality in areas failing to meet federal air quality standards. As enacted, eligibility was limited to ozone and carbon monoxide nonattainment areas only; particulate matter areas and maintenance areas were not eligible until later laws broadened the program. Funds were apportioned to states based on weighted nonattainment area population, with weights rising by classification severity, so the regions with the worst air received the most money. Eligible projects included transit improvements, traffic flow improvements, and bicycle and pedestrian facilities that reduced emissions.

Q: Did ISTEA let states move highway money to transit?

Yes, through three distinct statutory mechanisms rather than a general permission. First, Surface Transportation Program funds were directly usable for transit capital costs eligible under the federal transit laws, through 23 U.S.C. 133(b)(2), with no transfer required. Second, 23 U.S.C. 104(f) authorized direct transfers between highway and transit programs in both directions, highway to transit and transit to highway. Third, program to program transfer authority let states move funds among the highway programs, including up to 50 percent of National Highway System apportionments to the STP, rising to 100 percent with Secretarial approval. Use was uneven across states, and the General Accounting Office measured 3.4 billion dollars in program to program transfers in fiscal 1992 through 1997.

Q: Why did ISTEA arrive when the interstates were finished?

ISTEA arrived at the end of the Interstate construction era because the federal program needed a new organizing purpose once its great project wound down. A 1991 General Accounting Office report, RCED-91-147, described a system of more than 44,000 miles as nearly complete, and the final original segment, through Glenwood Canyon on Interstate 70, opened October 14, 1992. Senator Daniel Patrick Moynihan captured the moment by saying the country had poured enough concrete and should get more transportation out of the roads already built. The statute’s own title I declared its Interstate construction authorizations the final ones for completion. With building ending, Congress redirected the federal role toward maintaining the system, choosing among investments through planning, and tying transportation to air quality.

Q: What are transportation enhancements in ISTEA?

Transportation enhancements were ten congressionally named categories of projects eligible for a ten percent set aside of each state’s Surface Transportation Program apportionment under 23 U.S.C. 133(d)(2). The ISTEA categories were pedestrian and bicycle facilities, pedestrian and bicyclist safety and educational activities, acquisition of scenic easements and scenic or historic sites, scenic or historic highway programs including tourist and welcome centers, landscaping and scenic beautification, historic preservation, rehabilitation of historic transportation buildings including railroad facilities and canals, preservation of abandoned railway corridors including trail conversions, control and removal of outdoor advertising, and archaeological planning and research. Later laws added categories sometimes misattributed to ISTEA. The set aside made the statute’s intermodal ambition visible.

Q: How does ISTEA tie transportation plans to air quality?

ISTEA tied plans to air quality by making federal approval of transportation plans and programs conditional on conformity with air quality law. Section 176(c) of the Clean Air Act, 42 U.S.C. 7506(c), bars federal transportation agencies from supporting plans or projects that do not conform to the approved state air quality plan. ISTEA’s rewrite of 23 U.S.C. 134 and 135 required metropolitan planning organizations to perform conformity determinations showing that projected emissions from their long range plans and improvement programs stay within the state plan’s motor vehicle emissions budgets. The Federal Highway Administration and Federal Transit Administration must issue a conformity finding before approving the plan and program. If conformity lapses, only exempt projects may advance until it is restored.

Q: Which laws replaced ISTEA?

The successor surface transportation authorizations, by name and year, are the Transportation Equity Act for the 21st Century of 1998, the Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users of 2005, the Moving Ahead for Progress in the 21st Century Act of 2012, the Fixing America’s Surface Transportation Act of 2015, and the Infrastructure Investment and Jobs Act of 2021. ISTEA authorized fiscal years 1992 through 1997 and expired September 30, 1997, with the Congressional Research Service recording one six month extension before the next authorization took effect. Each successor retained the core ISTEA architecture of metropolitan planning, transportation management area project selection, fiscal constraint, conformity, and program flexibility, carrying those procedures forward while adjusting funding levels and program details.

Q: What population threshold makes an urbanized area a transportation management area?

An urbanized area with a population over 200,000 is designated a transportation management area under the planning regulations at 23 CFR 450.104. The threshold is the hinge of ISTEA’s authority shift. Below it, the metropolitan planning organization carries out the planning process and the state retains the larger role in project selection. Above it, within a TMA, the MPO selects federally funded projects from the transportation improvement program in consultation with the state and any affected public transportation operator, under 23 U.S.C. 134. For National Highway System, bridge, and Interstate maintenance projects inside a TMA, the state selects in cooperation with the MPO. TMAs are also subject to federal certification review of their planning processes.

Q: Which ten categories did ISTEA name for transportation enhancements?

ISTEA named exactly ten enhancement categories eligible for the ten percent Surface Transportation Program set aside under 23 U.S.C. 133(d)(2). They were facilities for pedestrians and bicycles, safety and educational activities for pedestrians and bicyclists, acquisition of scenic easements and scenic or historic sites, scenic or historic highway programs including tourist and welcome center facilities, landscaping and other scenic beautification, historic preservation, rehabilitation and operation of historic transportation buildings, structures, or facilities including historic railroad facilities and canals, preservation of abandoned railway corridors including conversion for pedestrian or bicycle trails, control and removal of outdoor advertising, and archaeological planning and research. Categories sometimes attributed to ISTEA, such as water pollution mitigation and transportation museums, were added by later laws.

Q: Which areas were eligible for CMAQ funds as ISTEA enacted the program?

As enacted in 1991, CMAQ funds were available only for projects in ozone and carbon monoxide nonattainment areas. Particulate matter nonattainment areas were not eligible, and maintenance areas, regions that had attained the standards and were maintaining them, were not eligible either. The limitation is one of the most commonly misremembered details of the statute, because the 1998 successor law later broadened eligibility to particulate matter and maintenance areas, and later descriptions of the program often describe the expanded version. The enacted scope reflected the air quality politics of 1991: ozone and carbon monoxide were the pollutants most directly tied to motor vehicle emissions, so the program aimed squarely at transportation sources of those pollutants.

Q: What happened when a transportation plan lapsed on conformity?

When conformity lapsed, meaning the metropolitan planning organization could no longer demonstrate that its plan and transportation improvement program stayed within the state air quality plan’s motor vehicle emissions budgets, or the federal agencies could not issue a positive conformity finding, the region entered a restricted state. Only exempt projects could advance to federal approval: safety improvements, transit operations, bicycle and pedestrian facilities, and other project types defined by regulation as having neutral or beneficial air quality effects. New highway capacity projects, the projects most likely to increase emissions, could not proceed. The lapse ended when the MPO produced a new conforming plan and TIP and the Federal Highway Administration and Federal Transit Administration issued a fresh conformity finding.

Q: What share of NHS funds could a state move to the Surface Transportation Program?

A state could transfer up to 50 percent of its National Highway System apportionment to the Surface Transportation Program on its own authority, and up to 100 percent with the approval of the Secretary of Transportation. The provision was the most used of ISTEA’s program to program transfer authorities, because it let states redirect money from the federally defined NHS network to the flexible STP, whose funds could then support transit capital, safety, enhancements, and other eligible uses. The General Accounting Office found that states transferred 3.4 billion dollars among programs in fiscal years 1992 through 1997. The transfer pattern varied widely by state, which the drafters intended: the statute decentralized the allocation choice rather than prescribing it.

Q: What mileage cap did ISTEA set for the National Highway System?

ISTEA capped the National Highway System at 155,000 miles, plus or minus fifteen percent, and directed the Secretary of Transportation to complete the designation within two years. The cap forced choices about which corridors would carry the federal designation: the Interstate routes, the defense strategic highway network, strategic highway connectors serving military installations and ports, and the principal arterials carrying the heaviest intercity and interstate travel. Corridors outside the NHS found their federal aid home in the Surface Transportation Program or left the federal aid system entirely. Congress completed the formal designation in 1995 through separate legislation. The federal matching share for NHS projects was generally eighty percent, a step down from the ninety percent that built the Interstates.

Q: Why did demonstration projects survive in a reform bill?

Because the reformers needed the votes of the project supporters. The planning rewrite, the flexibility provisions, and the enhancements set aside could not pass without members whose support was secured through designated projects in their districts. The conference reduced the earmark load from the House passed level to answer the administration’s veto threat, without eliminating the practice that members regarded as a legitimate expression of congressional priorities. The result was a statute that contained two systems at once: the reformed, planning driven, metropolitan empowered program that handled most of the money, and the older member driven project system that handled a visible and politically potent share of it.

Q: What did the transit title of ISTEA rename?

Title III of ISTEA, the Federal Transit Act Amendments of 1991, renamed the Urban Mass Transportation Administration as the Federal Transit Administration. The change was made by section 3004(c)(3) of the Act, as recorded in the editorial notes to 49 U.S.C. 101, which show the substitution of the new name for the old. The renaming was symbolic but deliberate. The old name described a clientele, urban mass transportation, inherited from the 1964 act that created the agency. The new name described a function within an intermodal system, matching the statute’s premise that transit was a mode to be integrated with highways rather than a separate federal program. The transit title also reauthorized the capital and formula grant programs and meshed them with the flexibility provisions of the highway title.

Q: Which transportation agency did ISTEA create?

Title V of ISTEA created the Bureau of Transportation Statistics, established in 1992, giving the Department of Transportation a dedicated statistical agency for transportation data. The Bureau’s creation reflected the drafters’ belief that better decisions required better data, and it was part of the statute’s acknowledgment that transportation policy needed knowledge infrastructure as well as physical infrastructure. The same research minded impulse produced the Intelligent Vehicle-Highway Systems Act of 1991, which authorized federal research into electronic tolling, traffic management, and vehicle highway communications, and the Symms National Recreational Trails Act of 1991, which created the national recreational trails funding program. A law organized around allocating wisely needed to measure the system it was allocating.

Q: What planning documents must an MPO produce under ISTEA?

Each metropolitan planning organization had to produce a long range transportation plan covering at least twenty years and a transportation improvement program listing the projects to be carried out in the near term. The plan had to address the fifteen planning factors spelled out in 23 U.S.C. 134(f), consider preservation, mobility, energy, land use, and air quality effects, and be developed with public involvement and coordination with transit operators and state and local officials. The TIP had to be consistent with the plan, and both had to be supported by financial plans demonstrating implementation with reasonably available revenues, the requirement that became fiscal constraint. Both documents were subject to the conformity determination in nonattainment and maintenance areas, and TMA planning processes faced federal certification review.

Q: What is the public law number of ISTEA?

ISTEA is Public Law 102-240 of the 102nd Congress, enacted as H.R. 2950 and printed at 105 Stat. 1914. The number records it as the 240th public law enacted by that Congress, and the Statutes at Large citation fixes its place in the permanent bound record of federal law. The enrolled bill was presented to the President on December 10, 1991, and signed by President George H. W. Bush on December 18, 1991, at a ceremony in Euless, Texas. Researchers use the public law number to retrieve the enrolled text, the conference report H. Rept. 102-404, the committee reports, and the signing statement from the archives. In the transportation literature, the number 102-240 functions as shorthand for the statute the way practitioners cite the Code.

Q: How much did ISTEA authorize over its six-year life?

The Congressional Research Service scored the ISTEA authorization at 151 billion dollars over six fiscal years, 1992 through 1997, while the Federal Highway Administration’s contemporaneous program guide described about 155 billion dollars. The difference reflects scoring conventions rather than disagreement about the statute’s contents, and the responsible practice is to name the source with the figure. The Research Service later divided its total into roughly 119 billion dollars for highways and 32 billion for mass transit. The authorization flowed through the Highway Trust Fund’s highway and transit accounts, fed by the dedicated excise taxes extended in the Surface Transportation Revenue Act of 1991. The authorization expired September 30, 1997, with one six month extension recorded before the successor law. The six year horizon was the era’s standard authorization rhythm.