321.432 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 two hundred feet, but no horn or other warning device shall 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 the horn but shall not otherwise use such horn when upon a highway. [S13, §1571-m17; C24, 27, 31, 35, §5040, 5041; C39, §5034.41; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §321.432] Referred to in §321.234A, 805.8A(3)(af) For applicable scheduled fine, see §805.8A, subsection 3
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