You drive at night on a rural road with your high beams on. You enter thick fog, and the light seems to bounce back at you as a white glare. What should you do?

Correct answer: Use low beams and slow down, because high beams reflect off fog.

Why

Fog is made of water droplets that reflect light, so high beams make a bright wall in front of you. Low beams aim down at the road and reflect less, and other drivers can still see you. West Virginia law requires headlights, not parking lights alone, when fog is present, and the basic speed rule requires a lower speed when weather cuts your view.

Verified against West Virginia Driver's Licensing Handbook · Headlights and Their Use · p. 61