The emergency exit door:

Question

Check all emergency exits before operating a bus. Never drive a bus with an open emergency exit door or window.

Accepted Answer

Should never be open while the bus is being driven.

Answer

Can be opened if the bus becomes too hot while being driven.

Answer

Can be opened while the bus is being driven if the bus is carrying cargo.

Answer

Can be opened to provide a better view while the bus is being backed.