California Code, Penal Code - PEN § 588b

Any person who wilfully breaks down, removes, injures, or destroys any barrier or obstruction erected or placed in or upon any road or highway by the authorities in charge thereof, or by any authorized contractor engaged in the construction or maintenance thereof, or who tears down, defaces, removes, or destroys any warnings, notices, or directional signs erected, placed or posted in, upon, or adjacent to any road or highway, or who extinguishes, removes, injures, or destroys any warning light or lantern, or reflectorized warning or directional sign, erected, placed or maintained by any such authority in, upon or adjacent to any such road or highway, shall be guilty of a misdemeanor.