What is the right thing to do?

In this scenario, the relevant traffic rules focus on the interaction between vehicles and pedestrians at an intersection.

1. **Indication**: When you're approaching an intersection, it's essential to signal your intentions, especially when turning. This is crucial for informing other road users, including vehicles and pedestrians, about your actions.

2. **Priority Rules**: The yellow car in this situation must yield to other vehicles or pedestrians present. According to German traffic rules, when a vehicle is on a main road, others coming from secondary roads must yield. If the yellow car is on a road that requires yielding, it cannot proceed until it is safe.

3. **Waiting**: If you're in a situation where you need to yield (as indicated by the traffic signs) or if the pedestrian has the right of way, you should wait for a clear passage.

In this case, the combination of indicating and ensuring that the other vehicle (the yellow car) has to wait or giving way to pedestrians is essential for safe driving and adherence to the law. Not adhering to these rules can lead to accidents and fines. Understanding these elements is vital for responsible driving in Germany.