The EPA is approving a revision to the New Mexico State Implementation Plan (SIP) that contains the transportation conformity rule. The conformity rules assure that in air quality nonattainment or maintenance areas, projected emissions from transportation plans and projects stay within the motor vehicle emissions ceiling in the SIP. The transportation conformity SIP revision enables the State to implement and enforce the Federal transportation conformity requirements in regulations on Conformity to State or Federal Implementation Plans of Transportation Plans, Programs, and Projects Developed, Funded or Approved Under Title 23 U.S.C. or the Federal Transit Laws. The EPA's approval action streamlines the conformity process and allows direct consultation among agencies at the local levels. The final approval action is limited to regulations on Transportation Conformity. We approved the SIP revision on conformity of general Federal actions on September 9, 1998 (61 FR 48407).