Why should you avoid high beam headlight in fog?

• A. They will reflect back and cause glare
• B. They will improve distance visibility
• C. They will reduce glare
• D. They are illegal in fog

Answer: (A)

In fog, light behaves differently because the tiny droplets scatter and reflect light in all directions. High beam headlights shoot a bright, long-range beam that travels through the fog and much of it bounces back toward you, creating a strong glare that washes out the road and makes it harder to see. Using low beams keeps the light directed toward the road surface, reducing backscatter and helping you see lane markings and obstacles more clearly. If your vehicle has fog lights, they can help illuminate the road edge without creating the same backscatter as high beams. High beams don’t improve distance visibility in fog; they actually make visibility worse for you and for other drivers due to the glare.