Which statement about headlights is true?

• A. Headlights must be used from sunset to sunrise or when visibility is poor.
• B. High beams should be used in fog to improve visibility.
• C. Daytime running lights are illegal to use during the day.
• D. Headlights should be turned off when it is cloudy.

Answer: (A)

Headlights are essential for making you visible to others and for giving you a better view of the road when light is low or weather reduces visibility. You should turn them on from sunset to sunrise and any time visibility is poor—such as in rain, fog, or snow, or whenever you’re using windshield wipers. Using high beams in fog is not helpful because the light bounces back at you, reducing rather than improving visibility, so it’s not the right choice in that situation. Daytime running lights aren’t illegal to use during the day; they’re often encouraged or required in many places, so the claim that they’re illegal is incorrect. And it’s not right to turn headlights off on a cloudy day—cloudy conditions can still limit how far ahead you can see, so keeping headlights on helps you stay visible to others.