Opening the rear door of a transit coach is an acceptable substitute for setting the parking brake.
Correct answer: B – FALSE
Some transit coaches have an interlock that applies the brakes and holds the throttle at idle while the rear door is open. The interlock releases when the door closes, so it must not be used in place of the parking brake. The Massachusetts manual specifically instructs bus drivers to use the parking brake independently of this feature.
Source: Massachusetts Commercial Driver’s License Manual — § 4.6, “Use of Brake-door Interlocks”

