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Question:

While driving at night, you must _________ when within 500 feet of an oncoming vehicle.

A dim your high-beam lights
Explaination

You must dim your high-beam headlights when within 500 feet of an oncoming vehicle, and within 200 feet when following another vehicle. If you do not lower your high-beam headlights, you could cause the other driver to crash, endangering yourself and other drivers.