Why must you brake now?

The reason you must brake now is because the motorbike is pulling out directly into your path without yielding the right-of-way. According to German traffic rules, vehicles entering or crossing a priority road must give way to traffic on the priority road. Even though you have the right-of-way, you must always be prepared to react if another road user violates this rule, especially when visibility is limited, such as when a vehicle obscures your view.

This situation emphasizes the importance of defensive driving: anticipating possible hazards and being ready to slow down or stop to avoid accidents, even when you legally have priority. In this case, braking promptly helps prevent a collision with the motorbike that unexpectedly emerged from the side road.