Which requirements must be met so that a farm trailer is exempt from registration?

The requirements for a farm trailer to be exempt from registration in Germany are important for ensuring that trailers used in agriculture or forestry operate safely and within the law. The two correct criteria you selected are:

1. The trailer may only be towed by truck tractors or self-propelled working machines when not driving faster than 25 km/h. This limits their use to specific vehicles and speeds, reducing the risk of accidents associated with higher-speed travel.

2. The trailer may only be used for agriculture or forestry purposes. This restriction ensures that the trailer is serving its intended function and not being used for general transport or commercial purposes, which would require registration.

The option regarding the official test (Hauptuntersuchung) is not part of the exemption criteria because the exemption is only valid under the specified conditions. Thus, adhering to the two selected criteria ensures that the trailer is used safely and appropriately within the defined legal framework without needing to be registered. Understanding these requirements is essential for complying with German traffic regulations and promoting road safety.