**Front fog lights** are essential for improving visibility in adverse weather conditions. You should turn them on when there is **fog, heavy rain, snow**, or even smoke, as these situations significantly reduce visibility on the road. Front fog lights, which can be white or yellow, help illuminate the road better in these conditions.

It is important to remember that rear fog lights, which are red, should only be used when visibility is extremely low, to avoid dazzling other drivers. In summary, front fog lights are a crucial tool for driving safely in **low visibility** conditions due to adverse weather phenomena.