Why should you not drive with your high beams on in fog?

Driving with your high beams on in fog is not advisable primarily because they reflect off the fog and can significantly reduce visibility. High beams illuminate a wider area and create more light, but this light can bounce off the water droplets in the fog, creating a glare that obscures your view ahead. Instead of piercing through the fog, the bright light diffuses, making it harder to see the road, other vehicles, or obstacles.

In foggy conditions, it is more effective to use low beams. Low beams provide adequate illumination without creating excess glare, allowing the driver to see more clearly through the fog. This adjustment is crucial for safe driving in reduced visibility conditions, as it enhances your ability to discern the road and navigate safely.