Practice question

What is the safest way to descend a long downgrade with a heavy combination?

  1. Coast in neutral
  2. Use only the trailer hand valve
  3. Turn off the trailer air supply
  4. Select a proper low gear and control speed before it builds

Answer: D — Select a proper low gear and control speed before it builds

The correct answer is shown above. Try the full quiz for additional practice.

Practice more: Massachusetts CDL Combination Practice Questions - Massachusetts CDL Combination Vehicles Test Exam →