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Question:

At night, if you're in heavy traffic or following another vehicle within 200 feet, you must use

A low-beam headlights.
Explaination

High beams help you see farther ahead, but they can blind the driver of a nearby vehicle. New Mexico law requires you to dim your headlights when you are within 500 feet of an oncoming vehicle or within 200 feet of a vehicle you are following.