Which vehicles are you allowed to overtake where you see this traffic sign?

This traffic sign indicates a prohibition on overtaking. It is designed to enhance safety by preventing drivers from passing other vehicles in areas where visibility may be limited or where it is otherwise risky to do so.

In this specific case, under German traffic rules, the sign means that you are not allowed to overtake motorcycles (with or without sidecars), cars, or any other vehicles in the designated area. The intent is to reduce the likelihood of accidents in high-traffic or hazardous zones. Always be aware of additional regulations and road conditions when considering overtaking.