California Code, Vehicle Code - VEH § 21117

(a) Local authorities may, notwithstanding Section 21101 or 21101.6, by written agreement approved by their legislative bodies, transfer among themselves the responsibility for maintaining, operating, or controlling public access to any highway under their respective jurisdictions located in or adjacent to an ecological reserve or an environmentally sensitive area within their respective jurisdictions.

(b) An agreement entered into pursuant to subdivision (a) may authorize the local authority having responsibility for the highway under the agreement to do all of the following:

(c) As used in this section, the term “ecological reserve” has the same meaning as defined in Section 1584 of the Fish and Game Code, and “environmentally sensitive area” has the same meaning as defined in Section 30107.5 of the Public Resources Code.