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A horn is a sound-making device that can be equipped to motor vehicles, buses, bicycles, trains, trams (a.k.a. ... The sound made usually resembles a honk. The vehicle operator uses the horn to warn others of the vehicle's approach or presence, or to call attention to some hazard.
Car horns are simple electromagnetic devices that produce loud, audible sounds to get the attention of nearby vehicle occupants or pedestrians.
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