You are driving at least 20 km/h faster than the green truck. What should you do?

Your answer is correct because when you are driving at least 20 km/h faster than the green truck on a motorway merging lane, you should enter the motorway ahead of the truck. This rule helps maintain smooth traffic flow and avoids forcing the truck to brake or change speed too abruptly.

The key German traffic rule here is that faster vehicles entering a motorway should merge early when it is safe, passing slower vehicles before them, not behind. This prevents danger caused by sudden braking or unexpected maneuvers from slower vehicles.

If you brake and merge behind the truck (option 2) or stop before merging and then enter behind another truck (option 3), you may disrupt traffic flow and increase risk of accidents or congestion.

So, merging ahead of the slower vehicle when you have a significant speed advantage is the safest and most efficient practice on the motorway.