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A. 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 two hundred feet (200'), but no horn or other warning device shall emit an unreasonably loud or harsh sound or a whistle.
B. The driver of a motor vehicle shall when reasonably necessary to ensure safe operation give audible warning with the horn but shall not otherwise use such horn when upon a highway. (2008 Code § 17-432)