Practice question

What does a brake-door interlock do on some urban mass transit coaches?

  1. Applies the brakes and holds the throttle at idle when the rear door is open
  2. Replaces the parking brake at every stop
  3. Allows driving with the rear door open at normal speed
  4. Shuts off all passenger signaling devices

Answer: A — Applies the brakes and holds the throttle at idle when the rear door is open

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