Cal. Sts. & High. Code § 682

Every city and county shall have power to grant franchises authorizing the exercise of any privilege in, along, across, under, through, over, and upon any state highway, or portion thereof, within its boundaries to the extent and in the manner that it shall have power to grant franchises authorizing the exercise of such privilege in, over, and upon city streets, or county highways, as the case may be, subject to the conditions and limitations provided in Sections 682 to 695, inclusive.