When do you have to switch on your dipped headlights?

You selected all correct answers. In Germany, you must use dipped headlights during twilight, at night when it is dark, and also when driving through a tunnel, regardless of outside light conditions. This ensures other drivers can see you clearly and improves your own visibility. Using headlights in these situations is required by law to ensure traffic safety. Always remember to switch them on whenever visibility is reduced or required by signs.