Why must the door and a window be opened at a railroad crossing rather than relying on the windows alone?

Pick an answer

1. It is only a habit passed down with no real safety purpose
2. It is required only for ventilation on hot days
3. It lets students hear the driver's announcements better while the bus waits at the crossing to move
4. It improves the driver's ability to hear an approaching train that might not yet be visible

Correct!

Not quite. The correct answer is highlighted.