Practice question

For a North Carolina CDL combination vehicle, when climbing a steep grade with a heavy combination vehicle, the best practice is to:

  1. Maintain top gear as long as possible
  2. Downshift early before losing speed so the engine stays in its power band
  3. Use the trailer hand valve to assist
  4. Push the trailer air supply knob in and out repeatedly

Answer: B — Downshift early before losing speed so the engine stays in its power band

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