Where is overtaking prohibited?

You answered correctly. Overtaking is prohibited when the traffic situation is not clear and where oncoming traffic could be obstructed. This is because overtaking in unclear situations or when it might endanger or block oncoming vehicles creates a significant risk of accidents. One-way streets, however, do not generally prohibit overtaking unless specific signs or road conditions indicate otherwise. Always make sure that you have a clear view of the road ahead and that overtaking does not put others in danger or block oncoming traffic. This attention to safety helps prevent accidents and is a key principle in German traffic rules.