When may a passenger bus be driven with an emergency exit door open?
Correct answer: D – Never
A bus must not be driven with an emergency exit door or window open. Before driving, emergency exits should be closed, their handles should be in safe working condition, and the emergency-exit markings must remain visible. Some roof hatches may be secured partly open for ventilation, but that separate guidance does not authorize driving with an emergency exit door or window open.
Source: Florida Commercial Driver’s License Manual — § 4.1.3, “Bus Interior”, Florida Commercial Driver’s License Manual — § 4.1.4, “Roof Hatches”

