When must you intervene as bus driver?

Your selection of all three choices is correct because as a bus driver, it is crucial to maintain passenger safety and compliance with regulations.

1. Improper use of safety devices like emergency door openers can put passengers at risk and hinder emergency evacuations.
2. Throwing objects out of the bus can create hazards for other road users and is a violation of safe driving practices.
3. Smoking in a regular bus violates regulations designed to protect the health and comfort of passengers.

Each of these actions requires intervention to ensure passenger safety and to uphold the rules set forth in German traffic law, emphasizing the importance of responsible behavior in public transport.