What is the right course of action here?

In the scenario shown, the critical point pertains to the right of way. According to German traffic rules, vehicles already on the main road have the right of way, while those merging from side streets must yield.

In this case, the red car is likely on the main road, while the yellow car and other vehicles may be merging. Therefore, if you're considering your options:

1. You may proceed ahead of the red car if you are on a main road.
2. The yellow car may also proceed ahead of the red car if it is on a parallel road but is yielding to the main road's traffic.

Proper understanding of these rules ensures safety and smooth traffic flow. Each option must reflect the appropriate yielding and right of way to avoid potential accidents.