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Iowa Class C Knowledge Test Practice
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Passing target: 20/25 correct (TLA practice target)
Weather, Visibility & EmergenciesStandalone practice
When must an Iowa motor vehicle display lighted headlamps?
Correct answer: From sunset to sunrise and when visibility is 500 feet or less.
Why
Use headlights from sunset to sunrise and whenever lighting is insufficient to clearly distinguish people and vehicles 500 feet ahead, including in rain, fog, snow or sleet. Using headlights with wipers is useful extra guidance; the cited lighting law uses the actual visibility condition.
Verified against Iowa Driver's License Manual · Headlights · p. 24, 49
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