What is the right course of action now?

In this situation, German traffic law requires you to obey the "no overtaking" sign, which remains in effect until it is explicitly canceled by another sign. When you are behind a slow or turning vehicle in such a zone, you must not attempt to overtake—even if the vehicle ahead slows down or turns off the road.

The correct actions are to reduce your speed (option 1: "I brake") to maintain a safe following distance as the truck turns, and to stay in your lane (option 2: "I continue on the right-hand lane for now"), waiting patiently until it is safe and legal to proceed. Moving into the left lane to overtake (option 3) is not allowed because the no-overtaking restriction applies to all motor vehicles, regardless of how slow the vehicle ahead is moving.

Understanding this rule helps you recognize that overtaking in a no-overtaking zone is never permitted—even momentarily or to pass a turning vehicle—until the restriction is officially lifted. Always watch for relevant traffic signs and be prepared to adjust your driving accordingly.