What must you remember after you have coupled up a trailer to an automatic trailer coupling?

Your selection included the correct elements: the coupling pin must be fully engaged and the position of the control pin. These are crucial for ensuring the trailer is properly secured and safe to transport.

This process reflects German traffic regulations emphasizing the safety of trailer coupling. A fully engaged coupling pin guarantees that the trailer will not detach unexpectedly, while checking the position of the control pin ensures that all safety mechanisms are functioning properly. Both are vital steps to prevent accidents on the road.

The missing third part about ensuring the coupling jaw cannot move to the side is also important because it confirms that the trailer coupling is stable and not at risk of disengaging while driving. Together, these checks ensure the trailer is securely attached, minimizing the chances of incidents. Adhering to all these points is essential for road safety.