The coupling pins of your trailer hitch have a diameter of 38 mm when new. What should you note regarding wear?

The selected combination is correct because both statements address important safety standards for trailer towing under German traffic regulations.

1. The first statement is crucial as it specifies that the diameter of the coupling pins must not fall below 36.5 mm to ensure a secure connection between the trailer and the vehicle, which is essential for vehicle stability and safety while driving.

2. The second statement highlights the need for the lower pin guide to be free from excessive free play. This condition is important to maintain the integrity of the coupling and prevent any potential detachment during transit, which could lead to dangerous situations on the road.

Both of these regulations aim to ensure that trailers are safely hitched and operate within defined safety parameters, reducing the risk of accidents. Understanding these requirements helps in maintaining a safe driving environment for everyone on the road.