When visibility is reduced by fog, which headlights should you use?

• A. High beams
• B. Parking lights
• C. Hazard lights
• D. Low beams

Answer: (D)

Fog scatters light, so you want lighting that minimizes glare and keeps illumination close to the road. Low beams point light downward and stay below the fog layer, reducing the backscatter that can wash out your view and make it harder to see obstacles or lane markings. High beams shoot light further into the fog, creating a bright glare that reduces visibility for you and other drivers. Parking lights are too dim for driving, and hazard lights are for signaling a problem or a stopped vehicle, not for improving visibility while moving. So, using low beams is the safest and most effective choice in reduced visibility conditions.