A. The city engineer shall provide for the placement and maintenance of traffic control devices, signs, signals, and markers when and as required under the traffic regulations of the city, and may place and maintain such additional traffic control devices as may be deemed necessary to regulate traffic under the traffic laws of the city or under state law or to guide or warn traffic.

B. The operator of any vehicle shall obey the instructions of any official traffic control device applicable thereto placed in accordance with the traffic regulations of the city unless otherwise directed by a police officer or other duly authorized city agent, subject to the exceptions granted in this title or by state law. [Code 2004 § 12-33.]