The Department shall mark center lines, lane lines, symbols and words and install raised devices or other devices upon the surface of the pavement to indicate the course to be travelled by vehicles at any place where the Department determines that such markings or devices are necessary for the orderly and safe movement of traffic. Such markings and installations shall be made consistent with state law and in accordance with those standards and methods set forth in the California Traffic Manual. (Amended by Ord. No. 151,833, Eff. 2/10/79, Oper. 2/25/79.)