(A) It shall be unlawful for the driver of any vehicle to disobey the signal of any official traffic-control device placed in accordance with the provisions of this traffic code or of a traffic barrier or sign erected by any of the public departments or public utilities of the city, or any electric signal, gate or watchman at railroad crossings, unless otherwise directed by a police officer. However, the type and the right to or necessity for the barrier or sign must be approved by the city.
(B) A sign, signal, marking or barrier shall have the same authority as the personal direction of a police officer.
('88 Code, § 70.17) Penalty, see § 70.99