California Code, Government Code - GOV § 29532

(a) For a county included within the jurisdiction of a statutorily created regional transportation planning agency, that agency.

(b) For a county which is not included within the jurisdiction of a statutorily created regional transportation planning agency but for which there is a council of governments, and an election has not been made pursuant to Section 29536, that council.  For a county which is not included within the jurisdiction of a statutorily created regional transportation planning agency but for which there is a council of governments for which an election has been made under Section 29536 to form a local transportation commission, the local transportation commission authorized in Section 29535.

(c) For a county not within the jurisdiction of a statutorily created regional transportation planning agency or a council of governments, the local transportation commission authorized in Section 29535.

(d) Upon the request of a county within the jurisdiction of the multicounty designated transportation planning agency, as defined in Section 130004 of the Public Utilities Code, that agency.