Except for a roof hatch designed to be partly open, when may you drive a bus with an emergency exit door or window open?
Correct answer: D. – Never
Do not drive with an emergency exit door or window open. Check the bus before departure and close any open emergency exits and access panels. Some roof hatches may be secured in a partly open position for ventilation, but they are treated separately and should not be left open as a regular practice.
Source: North Dakota Commercial Driver License Manual (2025–2027) — § 4.1.3, “Bus Interior”, North Dakota Commercial Driver License Manual (2025–2027) — § 4.1.4, “Roof Hatches”

