If a bus has a red emergency-door light, when must it be turned on?
Correct answer: C – At night or whenever the outside lights are used
A bus equipped with a red emergency-door light must have that light in working condition. The driver must turn it on at night and at any other time the bus’s outside lights are used. The emergency-exit sign on the door must also remain clearly visible.
Source: Alabama Commercial Driver License Manual — § 4.1.3, “Bus Interior.”

