Travelling on a main road after a lengthy period of time of following behind, you are finally able to overtake a very slow-moving car. What should you do?

Your choice is correct because after overtaking a slower vehicle, German traffic rules require you to merge back into the lane only when you have a safe and adequate distance from the overtaken car. This ensures you do not force the other driver to brake or impede their driving. Braking to signal slow speed or driving slowly to highlight their behavior is not appropriate and can be unsafe or bothersome. The key rule is to complete the overtaking maneuver smoothly and safely, maintaining safety for both drivers.