You are driving in dense fog. What headlight setting does the manual recommend?
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A.
Bright headlights, to see farther ahead
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B.
Parking lights, to reduce glare
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C.
Hazard flashers with headlights off
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D.
Dim headlights, or fog lights if equipped Correct
The answer is "Dim headlights, or fog lights if equipped"
In fog, drive with headlights on dim, or with fog lights if the vehicle has them. Bright beams bounce back off the water droplets and cut what visibility you have. Choice A is the trap: drivers reach for high beams by habit on any dark road, expecting them to reveal more, and end up seeing less.
The traps in the wrong answers
A. Bright headlights, to see farther ahead
Bright headlights in fog reflect off the water droplets and reduce visibility, not extend it. This answer carries the see-farther-with-brights habit from clear night driving into conditions where the beam bounces back.
B. Parking lights, to reduce glare
Parking lights are not driving lights and don't satisfy the manual's headlight-with-wipers rule. This answer picks the dimmest option to fight glare, where the manual asks for dim headlights and not parking lights.
C. Hazard flashers with headlights off
The manual keeps you driving with headlights on in fog, not blacked out and flashing. This answer treats fog as an emergency stop condition rather than a slow-driving condition.
This question tests your knowledge of Emergencies in Illinois. Source: Illinois Rules of the Road, "Weather Conditions - Fog," p.84..
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