Unless the context otherwise requires, the provisions of this chapter govern the construction of this part.

“County transportation commission” means such a commission created pursuant to Division 12 (commencing with Section 130000) of the Public Utilities Code.

“Secretary” means the Secretary of Transportation.

On and after January 1, 1985, any duty, power, purpose, responsibility, or jurisdiction which is vested by this part in the secretary is hereby transferred to the Director of Transportation. Whenever any reference is made in this part to the secretary, it shall be deemed to be a reference to, and to mean, the Director of Transportation.

“Transportation planning agency” means an entity designated by the secretary pursuant to Section 29532.

For purposes of this part, the Counties of Imperial and Ventura shall serve as the transportation planning agency for their respective jurisdictions. The San Diego Metropolitan Transit Development Board shall serve as the transportation planning agency for its area of jurisdiction.