When must you intervene as driver of a school bus while you are driving?

As the driver of a school bus, your role includes ensuring the safety of the children on board. In the context of the question, intervening is necessary in specific situations to maintain this safety.

1. Entering the marked-off area is critical because it indicates an active zone for children who may be boarding or leaving the bus. As a driver, you must ensure that children are not entering this area unsafely.

2. When children are standing on the seats, it poses a significant safety risk. They could fall, injure themselves, or obstruct your view, necessitating intervention to maintain safety on the bus.

The combination of these two points reflects a comprehensive understanding of safety protocols that align with German traffic regulations. It's important to recognize that failure to address these issues can lead to dangerous situations, which is why both interventions are necessary.