When must a school bus be marked with orange school bus signs?

In Germany, school buses must be marked with orange school bus signs not only when they are transporting school children, but also before and after transporting them. This is critical for ensuring the safety of children at all times, indicating to other road users that they should be especially cautious. The markings help to alert drivers to the presence of children who may be boarding or disembarking from the bus, reducing the risk of accidents. Therefore, it's important to recognize that the correct combination includes both the actual transportation of children and the preparation phases before and after.