Section 38280 Of Article 1. Traffic Signs, Signals, And Markings From California Vehicle Code >> Division 16.5. >> Chapter 5. >> Article 1.

. Federal, state, or local authorities having jurisdiction over public lands may place or cause to be placed and maintained, such appropriate signs, signals and other traffic control devices as may be necessary to properly indicate and carry out any provision of law or any duly adopted regulation of such governmental authority or to warn or guide traffic.