You should use your horn when:
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Another vehicle is in your way.
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A child or older person is walking on the sidewalk.
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It may help prevent a collision.
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Another driver makes a mistake.
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Explanation
Your horn can get the attention of someone who may not be looking your way and alert them to the potential danger. You should use your horn whenever it will help prevent an accident. When another vehicle is in danger of hitting you, or when you've lost control of your car and are moving toward someone, sound a sharp blast on your horn to help prevent the collision.
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This question appears in the following DMV practice tests: