Cal. Sts. & High. Code § 250

It is hereby declared to be essential to the future development of the State of California to establish and construct a statewide system of freeways and expressways and connections thereto without regard to present jurisdiction over the highways, roads, and streets that might be included. It is the intent, further, that the California Freeway and Expressway System be completed with provision for control of access to the extent necessary to preserve the value and utility of the facilities to be constructed.