How can you see that the coupling pin has engaged correctly in the case of an automatic trailer coupling?

Your answer is correct because in German traffic regulations, the proper engagement of an automatic trailer coupling is confirmed primarily by the position of the control pin on the coupling itself or by a control light inside the driver’s cabin. These indicators are designed to clearly show whether the coupling is locked securely.

The other options, such as checking the release lever's position or moving the vehicle briefly, are not reliable methods to ensure safe coupling. Relying on the control pin or electronic indicator helps prevent accidents caused by improperly attached trailers. Understanding and trusting these built-in signals is essential for safe driving with trailers.