What must you remember when transporting luggage in buses?

The combination you selected is correct because it reflects the key requirements for safely transporting luggage in buses according to German traffic rules.

1. The luggage must be safely loaded: This is vital to prevent any risks during transportation, such as luggage shifting or falling, which could endanger passengers and drivers alike.

2. Passages and doors must remain free: Keeping pathways clear is essential for the safety and accessibility of all passengers. In emergencies, unobstructed exits are crucial for swift evacuation.

While the third option about using specially marked compartments is common practice in some situations, it is not universally mandatory. Therefore, the first two points are the primary focus of safety regulations in this context. Understanding and adhering to these rules helps ensure a safe and efficient travel experience for everyone on board.