257.706 Horn or other warning device; siren, whistle, air horn, or bell; theft alarm signal device.
Sec. 706.
(a) A motor vehicle, including a motorcycle or moped, 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 a horn or other warning device shall not emit an unreasonably loud or harsh sound or a whistle. 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 the horn when upon a highway.