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Under the Transportation Equity Act for the 21st Century (TEA-21), part of Montana's Congestion Mitigation and Air Quality (CMAQ) apportionment is dedicated to Missoula and at the direction of the Montana Transportation Commission, the Montana Department of Transportation (MDT) directs the remainder of the CMAQ apportionment to areas in nonattainment status that were previously ineligible for CMAQ funds to proactively address air quality and automobile congestion problems through the Montana Air and Congestion Initiative (MACI) program. The purpose of this project was to assess the cost-effectiveness of projects funded to date through the MACI/CMAQ program.
The protection of air quality through the control of man-made pollution is not only a relatively recent issue of policy concern but also a relatively new subject of scientific investigation.
Documented analysis procedures of travel and emission impacts of Congestion Mitigation/Air Quality (CM/AQ) Improvement Program projects are required by the Intermodal Surface Transportation Efficiency Act (ISTEA). The Texas Department of Transportation (TxDOT) realized a need to assist Texas metropolitan planning organizations (MPOs) with their analysis of CM/AQ projects. A search of the current literature and telephone surveys with FHWA personnel was conducted to assess what procedures were available for use in Texas, and to determine what procedures were in use around the nation. Through the span of this project, the importance of vehicle emissions associated with the vehicle's operating mode became increasingly important from results of research work sponsored by the U.S. Environmental Protection Agency (EPA). Several analysis examples of transportation projects are presented. Discussions of their expected versus evaluated benefits and potential impact of vehicle operating emissions on analysis techniques are given in the report. The report concludes with several caveats detailing findings and aspects of analysis discussed in this report.
The Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA) established the Congestion Mitigation and Air Quality Improvement (CMAQ) Program. The CMAQ Program emphasizes the importance of the link between transportation and air quality, by providing 6 billion dollars between 1992-1997 for transportation projects and programs to improve air quality. Consequently, many areas will be able to implement transportation control measures (TCMs), in compliance with the mandates of the Clean Air Act Amendments of 1990 (CAAA).