When are you allowed to remain on the left-hand lane in this situation?

In this situation, the signs indicate that the right lane will end in 200 meters. The truck in front shows a "no overtaking" sign (the red circle with two cars, one black and one red), and the speed limit is 60 km/h.

According to German traffic rules, you are only allowed to stay in the left lane if your vehicle with its load does not exceed 2 meters in width (option 1). This is because narrower vehicles can continue in the left lane without obstructing traffic. If your vehicle is wider than 2 meters according to the registration certificate (option 2), you must move to the right lane before the lane ends.

This rule ensures smooth merging and prevents congestion or accidents when lanes reduce. So, knowing the actual or registered width of your vehicle and load is important for safely using lanes during lane reductions.