Cal. Streets and Highways Code § 225.5

(a) Notwithstanding Section 22520.5 or 22520.6 of the Vehicle Code, and except as specifically authorized by this article, no person shall display, sell, offer for sale, or otherwise vend or attempt to vend any merchandise, foodstuff, or service within any vista point or safety roadside rest area. (b) No person shall solicit money within any vista point or safety roadside rest for any purpose. (c) When requested by a uniformed member of the Department of the California Highway Patrol, or other peace officer, any person or persons and any property may be relocated to a specified area of a vista point or rest area, or may be required to quit the premises, as directed by that officer, if, in the opinion of the officer, the person’s presence or activity or the presence of the property, creates, or may reasonably be expected to create, a safety problem , hazard, or nuisance, either on or near the vista point or safety roadside rest area. (d) To the extent the provisions of any regulations adopted by the department conflict with this section, those provisions are void, and permission given pursuant to those provisions for a person to engage in activities prohibited by subdivision (a) or (b) of this section is revoked.