This action approves a revision to the Texas State Implementation Plan (SIP) that contains the transportation control measures (TCM) rule. The requirements in the State TCM rule address the roles and responsibilities of the Metropolitan Planning Organizations (MPO), implementing transportation agencies, and provide a method for substitution of the TCMs without a SIP revision in the nonattainment and maintenance areas. The TCM rule is intended to promote effective implementation of the TCMs, streamline TCM substitution process and approval, and increase interaction between the Texas Natural Resource Conservation Commission (TNRCC) and the MPOs in the air quality- transportation planning process at the local levels. The EPA is approving this SIP revision under section 110(k) and 182 of the Clean Air Act (the Act). The rationale for the final approval action and other information are provided in this document.