A traffic jam is building up here. What is the correct procedure?

You answered correctly. In a traffic jam on a motorway or multi-lane road, it is important to switch on your hazard warning lights if you are approaching the end of a traffic jam to alert vehicles behind you. You should also drive as far as possible to the right to create a free channel (Rettungsgasse) on the left, which is required by law in Germany for emergency vehicles to pass through. The combination of these actions ensures both safety and legal compliance during a traffic jam. Traffic sign 3, which suggests driving as far as possible to the left, is only correct for the leftmost lane; since the image shows a middle or right lane, the correct rule is to keep right. Remember these rules to act correctly in future traffic jam situations.