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If a bus has a brake and accelerator interlock system, the system should

A Never be used in place of the parking brake
Explaination
Urban transit buses may have a brake and accelerator interlock system, which applies the brakes and holds the throttle in an idle position while the rear door is open. This system should not be used as a substitute for the parking brake. more
B Be turned off in most situations
C Only be used in inclement weather
D Operate the rear door