What should you do now?

Your answer was correct. In this situation on the Autobahn, you should remain in your lane because the red car to your left is already moving over and overtaking. Changing lanes now would be dangerous and could interfere with the red car’s movement.

According to German traffic law, you must not switch lanes if doing so could endanger or hinder another vehicle that is already overtaking or changing lanes. You should always let a vehicle that has started a maneuver finish it before changing your position. Staying in your lane until the situation is clear is the safest and legally correct choice. This also follows the general rule of minimizing risk and ensuring smooth traffic flow.