New Hampshire Non-Commercial Operator Knowledge Practice Test
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At noon on a rural road, thick fog lets you see people and cars only about 300 feet ahead. What should you do with your lights?
A approaches thick fog in daylight. The road and center lines fade from view ahead; the card states noon and about 300 feet of visibility.
Correct answer: Turn on the low beams, because you cannot see clearly 1,000 feet ahead
Why
Fog, rain and snow reflect light, so high beams bounce back and make it harder to see ahead; low beams light the road with less glare, and fog lights, if the car has them, can also help. The headlight rule is not only for the night: it also applies whenever the weather cuts your clear view below 1,000 feet. Slow down to a speed at which you can stop within the distance that you can see.
Verified against New Hampshire Driver's Manual · Night driving; Headlights · p. 24, 21
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