High beams definitely do not get 100 meters of usable distance in fog, and in fact will reduce the visibility further. https://www.weather.gov/safety/fog-drivi

High beams definitely do not get 100 meters of usable distance in fog, and in fact will reduce the visibility further. https://www.weather.gov/safety/fog-driving https://www.weather.gov/safety/fog-driving says: “ • Use fog lights if you have them. • Never use your high-beam lights. Using high beam lights causes glare, making it more difficult for you to see what’s ahead of you on the road. ”