No person shall drive a motor vehicle or other vehicle upon any roadway under the control and jurisdiction of the Board of Harbor Commissioners of the City of Los Angeles in territory described in Ordinance No. 66,267 of said city, approved April 5, 1930, herein called Harbor Department roadways, at a speed greater than is reasonable or prudent having due regard for the traffic on, and the surface and width of such roadway, and in no event at a speed which endangers the safety of persons or property; provided that during the present war emergency, it shall be unlawful for any person to drive a motor vehicle or other vehicle on any such Harbor Department roadway at a greater rate of speed than twenty-five (25) miles per hour. (Added by Ord. No. 86,874, Eff. 10/6/42.)