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Transportation Conformity

Transportation Conformity is a federal requirement in nonattainment areas to conduct air quality analysis on projects, programs, and policies identified in transportation plans, transportation improvement programs, federally funded projects, or projects requiring federal approval.  Conformity determinations must demonstrate consistency between emissions expected from the implementation of transportation plans and programs and Motor Vehicle Emission Budgets (MVEBs) in the applicable implementation plan.  To meet this criterion, conformity determinations in nonattainment areas with adequate MVEBs from an applicable State Implementation Plan (SIP), must perform a MVEB test.  For the MVEB test, the emissions analysis must demonstrate the estimated emissions are less than the MVEBs in the applicable implementation plan.

The determination of the analysis is a two-step process in metropolitan areas.  The first step is for the Metropolitan Planning Organization (MPO) to make the initial transportation conformity determination at the local level.  For the North Central Texas nonattainment area, this responsibility falls with the Regional Transportation Council (RTC), the MPO’s policy body.  The second step is for the Federal Highway Administration (FHWA) and Federal Transit Administration (FTA) to make a joint transportation conformity determination at the federal level.  Upon favorable federal approval, a four-year window begins during which projects, programs, and policies identified in the Metropolitan Transportation Plan and Transportation Improvement Program may move toward implementation.

2016 Transportation Conformity Analysis and Documentation

2016 Transportation ConformityThe Dallas-Fort Worth 2008 8-hour Ozone Reasonable Further Progress SIP revisions were adopted on June 3, 2015, and submitted to the Environmental Protection Agency (EPA) in July 2015.  On January 11, 2016, EPA published the Adequacy Status of the Dallas-Fort Worth,  TX Reasonable Further Progress 8-Hour Ozone Motor Vehicle Emission Budgets for Transportation Conformity Purposes, effective January 26, 2016 (81 FR 1184).





Previous Conformity Determination Letters


DFW Nonattainment Area Conformity Milestones


Transportation Conformity: A Basic Guide for State & Local Officials NEW!

Federal Highway Administration

Environmental Protection Agency



2/21/2018   JL/MG %Trans

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