What is a brake-door interlock on a bus?

a.A device that applies the brakes when the door is open

b.A lock that secures the door during an emergency stop

c.A device that applies the brakes when the rear door opens

d.A manual lock connecting brakes to the steering wheel

Explanation

A brake-door interlock is a device on newer buses that applies the brakes automatically when the door is open. It is designed to prevent the bus from moving while passengers board or exit.

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About the CDL Exam

The CDL (Commercial Driver License) exam tests your knowledge of commercial driving rules, safety procedures, and vehicle operation. You must score 80% or higher to pass the written knowledge test. The exam covers general knowledge, air brakes, combination vehicles, and various endorsements.

This question is from the Passenger Endorsement Test #1 section. Practice with more questions from this category to build confidence before taking the official DMV test.

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