Cal. Veh. Code § 2909

Any local political subdivision of this state, including, but not limited to, a city, a county, a city and county, a district, or a special district, is authorized to participate in a local traffic safety program within its jurisdiction if such local program is approved by the Governor; provided, however, that any local political subdivision may participate in a traffic safety program other than that promulgated pursuant to the federal Highway Safety Act of 1966.