The city traffic engineer is authorized to:

    A.    Designate and maintain, by appropriate devices, marks or lines upon the surface of the roadway, crosswalks at intersections where in his opinion there is particular danger to pedestrians crossing the roadway, and at such other places as he may deem necessary;

    B.    Establish safety zones of such kind and character and at such places as he may deem necessary for the protection of pedestrians;

    C.    Mark lanes for traffic on street pavements at such places as he may deem advisable and are consistent with this chapter and other traffic ordinances of this city. (Prior code § 15-31)