North Dakota Code § 39-21-36

Horn and warning device
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1. While being operated upon a highway, every motor vehicle must 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 [60.96 meters], but no 
horn or other warning device may emit an unreasonably loud or harsh sound or a 
whistle. Whenever reasonably necessary for safe operation, the driver of a motor 
vehicle upon a highway shall give audible warning with the vehicle's horn, but may not 
otherwise use the vehicle's horn while upon a highway.

2. No vehicle may be equipped with nor may any person use upon a vehicle any siren, 
whistle, or bell, except as otherwise permitted in this section.
3. Any vehicle may be equipped with a theft alarm signal device which is so arranged 
that it cannot be used by the driver as an ordinary warning signal.
4. Any authorized emergency vehicle may be equipped with a siren, whistle, or bell, 
capable of emitting sound audible under normal conditions from a distance of not less 
than five hundred feet [152.4 meters] and of a type approved by the department, but 
the siren may not be used except when the vehicle is operated in response to an 
emergency call or in the immediate pursuit of an actual or suspected violator of the 
law, in which events the driver of the vehicle shall sound the siren when reasonably 
necessary to warn pedestrians and other drivers of approaching vehicles.

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