Cal. Veh. Code § 2453

The California Highway Patrol shall serve as statewide information, assistance, and notification coordinator for all hazardous substances spill incidents occurring on highways within the State of California. The California Highway Patrol shall establish a single notification mechanism to serve as a central focus point for a hazardous substances spill response system. To assure timely notification of emergency personnel, the notification mechanism established pursuant to this section shall complement and not conflict with the system established pursuant to subdivision (b) of Section 8574.17 of the Government Code.