What is the maximum vertical play permitted for a coupling pin?

In the context of coupling pins used in vehicle towing and trailers, the maximum vertical play allowed is crucial for ensuring safety and stability during operation. The German traffic rule specifies that the vertical play must not exceed a certain measurement, which is defined to prevent excessive movement that could lead to dangerous situations on the road.

When considering options like 4 mm, 2 mm, and 6 mm, it's important to refer to the established standards that dictate the maximum allowable play. The correct answer indicates a specific standard that has been determined to ensure safe towing practices. Complying with these regulations guarantees that trailers and towed vehicles maintain proper alignment and reduce the risk of accidents caused by improper coupling.