South Dakota Operator License Knowledge Practice Test
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At night on a two-lane rural highway, you drive into thick fog. No other vehicles are near you. Which lights should you use?
Blue A travels on a two-lane rural road at night as thick fog hides the road ahead. No other vehicles are near A and no beam pattern is selected in the question.
Correct answer: Low-beam headlights, because high beams reflect off fog and cause glare
Why
Fog is made of small water drops that reflect light back toward you, so high beams make a bright wall of glare. Low beams aim down at the road, so you see more of the lane and its edge lines. Headlights also help other drivers see you, so slow down and keep them on until you are out of the fog.
Verified against South Dakota Driver License Manual · Night Driving · p. 66, 55
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