When must you intervene as bus driver?

The selected combination is correct because all three scenarios represent actions that a bus driver must intervene against to ensure the safety of passengers and compliance with German traffic regulations.

1. Improperly using safety devices, such as emergency door openers, could jeopardize passenger safety during an emergency.
2. Throwing objects out of the bus can distract other drivers and create hazardous road conditions.
3. Smoking in a regular bus poses health risks to passengers, especially in a confined space, and can violate regulations regarding public transport.

By addressing these behaviors, the bus driver upholds safety standards mandated by German law, ensuring a safe environment for all passengers. Recognizing and acting against these infractions is crucial for preventing potential accidents and maintaining order on public transport.