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CDL · General

At a railroad crossing, a bus driver opens the front door before crossing. What is the purpose of this action?

Correct answer

To improve the driver's ability to hear an approaching train — the windshield and sealed cab reduce sound; an open door allows train sounds to be heard more clearly before committing to cross

  1. A To cool the bus
  2. B To allow passengers to exit if they choose
  3. C To improve the driver's ability to hear an approaching train — the windshield and sealed cab reduce sound; an open door allows train sounds to be heard more clearly before committing to cross
  4. D Because federal regulations require bus doors to be open at all railroad crossings for exactly 30 seconds

Why this is the answer

The mandatory bus railroad crossing stop requires the driver to listen for trains. Modern bus cabs are significantly quieter than open air — the windshield, insulation, and engine noise can mask a train's horn and wheel noise until very close. Opening the front door removes this acoustic barrier. The procedure: stop within 50 feet but no less than 15 feet from the nearest rail; OPEN THE DOOR; look and listen in BOTH directions; shift to a crossing gear; proceed only when safe. Note: the door-opening requirement varies by state but is strongly recommended practice in all states.
Source: FMCSA CDL Manual, Chapter 11, Passenger Vehicles, Railroad Crossings, Open Door Procedure

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