California Code, Streets and Highways Code - SHC § 262.5

(a) Whenever the department determines that any state highway within or traversing United States National Forest lands meets the standards for official state scenic highways, the department shall designate the highway as an official state scenic highway and shall so indicate the highway in any publications of the department or in any maps which are issued by the department to the public.

(b) The department shall cause appropriate signs to be placed and maintained along those portions of the highways which the department has designated pursuant to subdivision (a) as official state scenic highways that indicate that those portions of the highways are official state scenic highways.

(c) If at any time the department determines that a state highway, designated as an official state scenic highway pursuant to subdivision (a), no longer meets the standards for official state scenic highways, it may revoke the designation of the highway as an official state highway and remove the signs which so indicate the highway.