Whenever a regular, extra or auxiliary policeman or policewoman or special police officer in uniform, or exhibiting his or her badge or other sign of authority is guiding or assisting school children across streets or street intersections, in the City, the driver of a vehicle travelling on such street or approaching such intersection, shall stop such vehicle upon signal from such policeman or policewoman and keep such vehicle stationary, until signaled to proceed. No policeman or policewoman shall signal the driver of any vehicle who has stopped in compliance with the provisions of this section, to proceed until after each child who has been crossing such street or intersection has reached a place of safety. (Ord. 75-1955 §1.)