Illinois Class D Written Exam Practice
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If driving in fog cannot be avoided, which combination is appropriate?
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: Slow down, leave more space, turn off cruise control, and use low beams.
Why
Slow down, increase your following gap, turn off cruise control, and use low-beam headlights in fog. High beams reflect glare back toward you. Fog lamps may supplement the required lighting; they do not remove the headlight duty. If visibility is too poor to stop within what you can see, leave the roadway safely and wait.
Verified against Illinois Rules of the Road, July2026 · Driving in fog · p. 87, 95
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