What should you do?

You answered correctly. In this situation, the car ahead is braking, which means you must reduce your speed and be ready to brake as well. German traffic law requires you to always drive at a speed that allows you to stop safely, especially when you see vehicles in front of you slowing down. You should not change lanes suddenly or attempt to overtake, as the left lane is not available and a motorcycle is close behind. Flashing your lights to signal or continuing without slowing is also incorrect, as it could endanger others. Always keep a safe distance and be prepared to react to what’s happening in front of you. This way, you ensure the safety of everyone on the road.