The Environmental Protection Agency (EPA) is proposing under the Clean Air Act (CAA or ``Act'') to approve a revision to the San Francisco Bay Area portion of the California State Implementation Plan (SIP). This revision consists of updated transportation conformity procedures related to the interagency coordination on project-level conformity and exchange of travel data for emissions inventories developed for air quality plans and regional transportation conformity analyses. The intended effect is to update the transportation conformity criteria and procedures in the California SIP.