When are you allowed to switch on rear fog lamps?

Fog lamps should only be used when visibility is severely reduced, specifically when visibility drops below 50 meters due to fog or other severe weather conditions. While some may think of using them in conditions like heavy rain, it is important to note that fog lamps are specifically intended for fog and not general low visibility. Using fog lamps inappropriately can create glare for other drivers and lead to unsafe driving conditions. Therefore, the correct use of fog lamps according to German traffic regulations is crucial for ensuring safety on the roads.