California Code, Streets and Highways Code - SHC § 690

The department shall have the power to prescribe the location, within the limits of the State highway, of any physical property to be constructed or installed in, under, over or upon such State highway pursuant to any such franchise. Before constructing or installing any such physical property in any State highway, the holder of the franchise shall apply to the department, or its authorized agent, for a permit, and the department shall issue a permit, in which it may impose reasonable conditions as to location, method and manner of construction. All such physical property is subject to relocation in the cases and in the manner provided in Section 680.