Drivers should use the horn:
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When feeling angry or upset.
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To alert other drivers that they made a mistake.
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If a driver is moving slowly, and you want them to drive faster.
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Only when necessary, to avoid collisions.
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Explanation
Drivers should use the horn only when necessary, specifically to avoid collisions. Honking is not appropriate for expressing impatience with slow-moving drivers, nor is it to be used to prompt pedestrians, bicyclists, or motorcyclists to move faster. The primary purpose of the horn is safety – to alert others of your presence and prevent potential accidents.
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This question appears in the following DMV practice tests: