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TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 419: Transportation Improvement Program Revision Process compiles and documents the different ways that metropolitan planning organizations (MPOs) approach revising a Transportation Improvement Program (TIP) once it has been adopted.
The Code of Federal Regulations is a codification of the general and permanent rules published in the Federal Register by the Executive departments and agencies of the United States Federal Government.
Transportation conformity is required under the Clean Air Act (CAA) Section 176(c) to ensure that Federally-supported transportation activities are consistent with (“conform to”) the purpose of a State Implementation Plan (SIP). Transportation conformity establishes the framework for improving air quality to protect public health and the environment. Conformity to the purpose of the SIP means Federal Highway Administration (FHWA) and Federal Transit Administration (FTA) funding and approvals are given to highway and transit activities that will not cause new air quality violations, worsen existing air quality violations, or delay timely attainment of the relevant air quality standard, or any interim milestone. This Guide was prepared to help State and local officials understand transportation conformity and how conformity requirements relate to transportation investments in their communities. Specifically, the implications of conformity on metropolitan transportation plans, transportation improvement programs (TIPs), and transportation projects are discussed. The Guide provides overview information on the major elements of the conformity process and provides answers to basic questions. Several exhibits are included in the Guide to illustrate key elements of the conformity process. Appendices are also included that discuss the health effects of pollutants, options to reduce on-road mobile source emissions, and resource agency contacts.
The Transportation Research Board's National Cooperative Highway Research Program (NCHRP) Synthesis 311: Performance Measures of Operational Effectiveness for Highway Segments and Systems examines the use of performance measures for the monitoring and operational management of highway segments and systems.
The Code of Federal Regulations Title 23 contains the codified Federal laws and regulations that are in effect as of the date of the publication pertaining to Federal highways, including national highway traffic safety.