What must you remember when the doors of your bus are operated independently?

The selected answers correctly reflect important safety protocols regarding bus door operation.

1. Regularly ensuring that squeeze protection is functioning is crucial for passenger safety. This means checking the mechanism that prevents the doors from closing on anyone, which is necessary to avoid accidents.

2. For doors without squeeze protection, ensuring that no passengers are caught is even more critical since there's no automatic safety feature to prevent this. Drivers need to be vigilant to avoid any incidents.

However, the third option is important to recognize as well. It states that with doors equipped with squeeze protection, one may set off while the indicator for an open door is still lit. This means that if the safety system is alerting the driver, it’s permissible to proceed only when it is confirmed that it is safe to do so, emphasizing the need for the driver to be aware of the system's status.

Thus, both attending to the functioning of the squeeze protection and avoiding to squeeze passengers are necessary steps to ensure safe bus operation. Understanding these rules helps ensure the safety of passengers and compliance with German traffic laws.