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In Pennsylvania, in which of the following situations are you required to turn on your headlights?

A All of the above answers

Under Pennsylvania law, you must turn on your headlights whenever visibility is reduced below 1,000 feet: between sunset and sunrise, in bad weather, in heavy overcast, in fog, etc. You must also switch on your headlights whenever you're driving through a work zone or you've switched on your windshield wipers because of weather conditions. [Managing Speed, Everyday Driving Skills, Chapter 3: Learning to Drive, Pennsylvania Driver's Manual]