Practice question

If a trailer begins to jackknife, you should not:

  1. Release the brakes.
  2. Apply the trailer hand brake.
  3. Allow the wheels to grip the road.
  4. Allow the trailer to straighten out.

Answer: B — Apply the trailer hand brake.

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

Practice more: Massachusetts CDL Combination Test 1 →