California Code, Public Utilities Code - PUC § 130291

(a) A linked traffic monitoring network of traffic monitoring devices placed in freeway lanes, surface street travel lanes, turn lanes, and on ramps within the freeway corridor to continuously monitor traffic speeds and volumes to identify congestion and traffic incidents.

(b) An interactive signal control system to allow central control personnel or systems to override regular signal cycles in order to expedite traffic flow of congested freeways and surface street intersections and to facilitate the diversion of traffic around congested areas.

(c) A traffic information management system providing commuter access to current traffic information through telephones, radio and television, home computers, terminals in office buildings, in-vehicle motorist information systems, computer-activated changeable message signs placed on freeways, at on ramps, at parking garages, and on major arterials within the freeway corridor.

(d) An improved emergency response system to accelerate the dispatch of emergency vehicles, traffic control officers, and signal maintenance crews, thus reducing the time needed to clear an incident causing traffic congestion.

(e) Tow service to reduce traffic congestion caused by delays in removing stalled or damaged vehicles from the freeway in accordance with plans developed by the Department of the California Highway Patrol in consultation with the Department of Transportation.

(f) A joint-agency data base system to coordinate construction and maintenance which impact traffic flow in the freeway corridor.