What is the right course of action now?

In the scenario depicted, the presence of a police officer indicates that traffic rules are being actively controlled. The correct course of action involves carefully crossing the junction while complying with the police officer's instructions, if given.

When a police officer is directing traffic, their signals take precedence over traffic signals and signs. Therefore, if you are in a position to cross without obstructing other vehicles, moving forward is appropriate. However, if the situation requires you to wait or pause for the blue vehicle or further instructions, these aspects must also be considered.

In German traffic law, you must respect both visual signals (like traffic lights and signs) and non-verbal cues from officers. Thus, it's essential to assess the environment and react accordingly while ensuring the safety of yourself and others at the junction.