Practice question

A driver sees daylight between trailer apron and fifth wheel after coupling. What is the danger?

  1. Landing gear height no longer matters
  2. The kingpin may be on top of closed jaws and the trailer can come loose
  3. The connection is extra secure
  4. The trailer brakes overheated

Answer: B — The kingpin may be on top of closed jaws and the trailer can come loose

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

Practice more: Iowa CDL Combination Vehicles Test Practice Questions - Iowa Commercial Driver License Combination Vehicles Test Exam →