How far in advance of a vehicle approaching from the opposite direction must you dim your bright headlights?
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A.
200 feet.
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B.
300 feet.
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C.
1,000 feet.
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D.
500 feet. Correct
The answer is "500 feet."
The manual sets 500 feet as the dimming distance before you meet an oncoming vehicle. Choice B is the passing distance for a vehicle ahead of you, listed in the same sentence, so a reader who scans for a number puts it into the wrong slot.
The traps in the wrong answers
A. 200 feet.
200 feet is not one of the two dimming distances the manual sets. This answer guesses a shorter figure that sounds close enough without checking the exact number.
B. 300 feet.
300 feet applies when you are catching up to a vehicle ahead of you, not one approaching from the front. This answer swaps the two dimming distances printed side by side in the same sentence.
C. 1,000 feet.
1,000 feet is the visibility trigger for turning headlights on, not the bright-lights dimming distance. This answer pulls the 1,000-foot object-visibility number from the same chapter and applies it to the wrong rule.
This question tests your knowledge of Adverse Conditions in Illinois. Source: Illinois Rules of the Road, "Special Driving Situations and Hazards: Night Driving," p.87..
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