Whenever any regulation designates any one-way street or alley, the City Engineer shall place and maintain traffic control devices giving notice thereof, and no such regulations shall be effective unless such traffic control devices are in place. Traffic control devices indicating the direction of lawful traffic movement shall be placed at every intersection where movement of traffic in the opposite direction is prohibited. Streets so designated shall be described in Schedule I, maintained in the register of the City Engineer. (Ord. 2670, 1996; Ord. 973 § 1, 1966; prior code § 19.6.1).