Who has to indicate in this situation?

In this traffic situation, the rules pertain to right of way and signaling. Both you and the blue car need to indicate your intentions to turn or merge.

According to German traffic regulations, drivers must signal their movements, especially when approaching an intersection or when changing lanes. This ensures other road users are aware of your actions, promoting safety and preventing misunderstandings.

The blue car also needs to signal, as it is navigating a lane where it may cut across other traffic. By each vehicle indicating correctly, they can avoid potential accidents and enhance overall traffic flow.

It’s crucial to fully understand the responsibilities of all drivers involved in a situation, which is why both must indicate in this case.