A. No person other than an officer of the police department or a person authorized by a police officer shall direct or attempt to direct traffic by voice, hand or other signal, except that persons may operate, when and as provided in this division, pushbutton pedestrian detector erected by order of the legislative body of the city.

B. A pushbutton pedestrian detector is defined as a detector of the push button type installed near the roadway and capable of being operated by hand for the sole purpose of controlling traffic signals to facilitate pedestrian traffic. It is unlawful to operate or activate such detector except for such purpose.

C. A pressure sensitive vehicle detector is defined as a detector installed in the roadway capable of being actuated by the pressure of a vehicle passing over its surface for the sole purpose of controlling traffic signals to facilitate vehicular traffic. It is unlawful to activate such detector or pass over its surface for a purpose other than that for which it is installed.

D. It is unlawful for any person to tamper with any official traffic sign, signal, detector or other device, or alter its position or direction in any manner.

E. The prohibitions contained in subsections B, C and D of this section shall not apply to any person who is authorized to do so by the traffic authority. (Prior code § 11.04.060)