When must attached working equipment be marked with red-white warning plates?

In German traffic rules, attached working equipment that poses a risk or extends beyond certain dimensions must be marked with red-white warning plates to alert other road users. Specifically:

1. If the equipment has parts that could be dangerous (sharp edges, protrusions), warning plates help increase visibility and prevent accidents.
2. When the equipment sticks out more than 40 cm beyond the side or rear lights of the tractor, it can be hard for others to judge the vehicle's width, so marking is mandatory.
3. If it extends more than 1 meter behind the rear lights, it creates a length hazard, and marking with warning plates ensures following drivers are aware and can keep a safe distance.

These rules help improve safety by making oversized or hazardous loads clearly visible on the road.