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Question:

When driving in fog, snow, or rain, you should use your

A low-beam headlights.
Explaination

High beams can reflect off precipitation, causing glare. Use low beams in fog, rain, or snow. (In fog, you may also use fog lights if your vehicle is equipped with them.) Your parking lights are for parking in dark locations, not driving. South Carolina law requires you to keep your headlights on whenever you drive between a half hour after sunset and a half hour before sunrise. It is illegal to use your parking lights instead. [SC Code § 56-5-4450]