BACK-UP ALARMS - 3622.2

Back-up alarms are required for every truck that has a body capacity of 2–1/2 cubic yards or more that is used to haul dirt, rock, concrete, or any construction material. The standard alarm to be used is a mechanical or approved electronic alarm that automatically emits a warning sound when the vehicle is moving in a reverse direction.  Alarms used shall be listed as acceptable by the Department of Industrial Relations

Such back-up alarms are recommended for use on other vehicles at installations where pedestrians are or may be exposed to the hazard of backing vehicles.