On an open Nevada road at night with your high beams on, how far ahead of an oncoming vehicle must you switch to low beams?
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A.
At least 500 feet before you meet an oncoming vehicle. Correct
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B.
Anywhere between 100 and 200 feet away.
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C.
At the 300-foot mark, the same rule that applies behind another car.
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D.
Once you can clearly see the driver's face in the oncoming car.
The answer is "At least 500 feet before you meet an oncoming vehicle."
The manual sets two dim-down distances that learners commonly mix up: 500 feet for oncoming vehicles, and 300 feet for a vehicle you are following. The 500-foot number is longer because high-beam glare hits the oncoming driver's eyes directly, so more warning time is needed for their vision to recover. Waiting until you can see the driver's face means the oncoming vehicle is already dangerously close.
The traps in the wrong answers
B. Anywhere between 100 and 200 feet away.
Falls far short of the manual's 500-foot minimum and leaves the oncoming driver blinded. This answer reflects the habit of waiting until oncoming glare feels uncomfortable, a cue that fires well inside the 500-foot cushion the manual asks for.
C. At the 300-foot mark, the same rule that applies behind another car.
Confuses the 500-foot oncoming-vehicle rule with the 300-foot rule for a vehicle you are following. This answer comes from collapsing both dim-down distances into a single 300-foot figure because remembering one number is easier than keeping the pair straight.
D. Once you can clearly see the driver's face in the oncoming car.
Waits far too late; seeing the driver's face means the oncoming vehicle is already almost upon you. This answer delays dimming until the oncoming vehicle is nearly on top of you.
This question tests your knowledge of Adverse Conditions in Nevada. Source: Nevada Driver Manual, "Chapter 5 - Special Driving Conditions: Night Driving," p.56..
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