When are you allowed to switch on rear fog lamps?

In Germany, rear fog lamps are used to enhance visibility during poor weather conditions, specifically when fog significantly reduces how far you can see. The primary regulation states that rear fog lamps should be activated when visibility falls below 50 meters due to fog.

Additionally, heavy rain can also cause visibility issues, although fog lamps are not specifically required for reduced visibility from rain alone unless it reaches similar severe conditions.

Using them under the right circumstances helps prevent accidents by making your vehicle more visible to others, but misuse or unnecessary use (like in light rain or good visibility) can cause glare and confuse other drivers. Therefore, understanding when and how to use rear fog lamps according to these regulations is essential for safe driving.