When are you allowed to switch on rear fog lamps?

You are allowed to switch on rear fog lamps when visibility is reduced to less than 50 meters due to fog. This ensures that your vehicle is visible to others in extremely low visibility conditions, enhancing safety on the road.

While heavy rain can reduce visibility, it does not qualify for using rear fog lamps according to German traffic regulations. Visibility being reduced to 100 meters is not severe enough for fog lamps either. Therefore, only the situation where visibility is below 50 meters due to fog warrants the use of rear fog lamps. It's important to choose the correct options to understand when these lamps are legally justifiable for safe driving.