What must you do when you are travelling and you notice that your vehicle is no longer roadworthy?

You answered correctly. If you notice your vehicle is no longer roadworthy, you must remove it from traffic as soon as possible and only continue your journey once the damage has been repaired. This ensures the safety of both yourself and others on the road. Continuing to drive a non-roadworthy vehicle can be dangerous and is not allowed under German traffic law. Proceeding to the next authorized dealer without addressing the issue first is not permitted, as the vehicle could pose a risk before any repairs are completed. Always prioritize safety by stopping and repairing the problem before driving further.