Practice question

On the North Carolina CDL combination test, what is the kingpin?

  1. A locking lever on the fifth wheel
  2. A vertical pin in the trailer apron that locks into the fifth wheel jaws
  3. A bolt that secures the landing gear
  4. The release handle for the trailer brakes

Answer: B — A vertical pin in the trailer apron that locks into the fifth wheel jaws

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Practice more: NC CDL Combination Vehicles Practice Questions - North Carolina CDL Combination Vehicles Test Exam →