What is correct?

In this situation, the traffic officer is giving a clear hand signal that the yellow car must proceed through the intersection first. As a driver, you must wait and prepare to move only after the yellow car has left the crossroads.

According to German traffic rules, when a police officer controls traffic, their signals override traffic lights and signs. The yellow car has the right of way here because the officer’s signal directs it to move. Your green right turn signal light means you are allowed to turn right, but you must wait until the intersection is clear and it is your turn.

The third option, turning immediately, is not allowed because you have to wait for the yellow car to leave the intersection first.

So, following the rules:
- The yellow car must leave the crossroads first (correct).
- You must get ready to proceed but wait until the yellow car has passed (correct).
- You cannot turn now (incorrect).

This ensures safe and orderly passage through the intersection when a traffic officer is directing.