You should use your low beams any time you are driving:
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At night.
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On a one-way street.
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In fog.
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On a freeway.
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Explanation
When driving in fog, it is important to use your low beams. Fog can significantly reduce visibility, and using high beams can reflect the light back, causing glare and making it even more difficult to see ahead. By using low beams, the light is directed downward and doesn't reflect as much, allowing you to have a clearer view of the road and potential hazards.
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This question appears in the following DMV practice tests: