No person, other than a city police officer, a city firefighter, a person authorized by the city manager, chief of police, fire chief, community development director, or the public works director, capital projects services director or the general services director, or a person otherwise authorized by law, shall direct or attempt to direct traffic by voice, hand or other signal; except that any person may affect the movement of traffic by operating a push button or other control device installed as part of the electrical circuitry of a traffic signal in order to facilitate street crossing by pedestrians and bicyclists.
(Ord. 2119, Ord. 2364 §109, Ord. 2439 §77)