Practice question

After coupling a tractor to a semi-trailer, which set of checks confirms the combination is safe to move?

  1. The trailer lights look bright from the driver's seat
  2. The trailer doors are closed and the load sheet is signed
  3. The tractor engine reaches normal operating temperature
  4. The fifth-wheel jaws are locked on the kingpin, air and electrical lines are connected, the landing gear is raised, and a gentle tug test is done

Answer: D — The fifth-wheel jaws are locked on the kingpin, air and electrical lines are connected, the landing gear is raised, and a gentle tug test is done

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