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Question:

When you're driving in fog at night, you should use

A low-beam headlights.
Explaination

High beams let you see farther ahead, but they can reflect off precipitation, causing glare. Use low beams in fog, rain, or snow. You may also use fog lights in addition to low beams, if your vehicle is so equipped. However, if fog becomes so thick that you can't see well, pull off the road in a safe place and stop until conditions improve. Remember: If you can't see, you can't drive.