25.1.8.310 Horns and Warning Devices

Every motor vehicle when operated upon a highway shall be equipped with a horn in good working order and capable of emitting sound audible under normal conditions from a distance of not less than 200 feet, but no horn or other warning device shall be used which does not produce a harmonious sound. The driver of a motor vehicle shall when reasonably necessary to insure safe operation, give audible warning with his horn but shall not otherwise use such horn when upon a highway.