When a transit coach has a brake-door interlock, opening the rear door applies the brakes and holds the throttle at idle.
Correct answer: A – True
On a transit coach operating in North Carolina, an installed brake-door interlock applies the brakes and keeps the throttle at idle while the rear door is open. The interlock releases when the door closes. This system is a safety feature, but the driver must not use it as a substitute for the parking brake.
Source: North Carolina Commercial Driver License Manual — § 4.6, “Use of Brake-door Interlocks”

