When visibility is reduced by fog, which headlight setting is recommended?

• A. High beams to cut through fog.
• B. Do not use headlights at all.
• C. Keep headlights on with daytime running lights only.
• D. Use low beams in fog to reduce glare and improve visibility.

Answer: (D)

When fog reduces visibility, you want headlights that minimize glare while lighting the road close to you. High beams bounce off the fog and create a bright haze that makes it harder to see, so they should not be used in foggy conditions. Daytime running lights aren’t a substitute for proper night lighting and won’t provide the needed contrast or illumination. Keeping low beams on directs light toward the road and reduces backscatter, improving your ability to see lane markings, edges, and potential hazards without blinding other drivers. If your car has dedicated fog lights, use them in addition to low beams, but only as intended for foggy conditions.