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New Mexico Class D Written Test Practice
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Weather, Visibility & EmergenciesStandalone practice
Thick fog forms while you drive on a rural highway late in the afternoon. Which lights should you use?
A approaches a thick bank of fog on a rural highway in late afternoon. Road markings become faint farther ahead.
Correct answer: Your low beams, and your fog lights as well if your vehicle has them
Why
Fog, heavy rain and snow scatter the light from high beams back toward you, so the road ahead becomes harder to see. Low beams aim the light down at the road, below most of the fog. Under NMSA 66-3-802, lamps must be on whenever the light is not good enough to see people and vehicles clearly at 500 feet, which is common in fog even in daytime.
Verified against New Mexico Driver Manual · Fog · p. 21
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