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Idaho Class D Knowledge Practice Test
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Weather, Visibility & EmergenciesStandalone practice
Daytime fog prevents you from clearly seeing people and vehicles 500 feet ahead. Which lights should you use?
Blue car A is centered in its eastbound lane on a two-way road in fog. The road edges remain visible around the vehicle.
Correct answer: Low-beam headlights
Why
Use low-beam headlights. Idaho requires the appropriate lamps when people and vehicles are not clearly visible 500 feet ahead, as well as from sunset to sunrise. Low beams reduce glare reflected from fog; parking lights alone are not enough.
Verified against Idaho Driver’s Handbook, July 2026 · Daytime low-visibility lights · p. 110
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