Home › CDL Practice Tests › Combination Vehicles Questions › Question 136
Once a combination vehicle has jackknifed completely and folded, what is realistic for the driver to do?
- A.A full jackknife can always be reversed by accelerating hard
- B.There is generally no recovery at that point; the priority becomes stopping safely and avoiding other vehicles if any control remains
- C.Releasing the fifth wheel will unfold the combination
- D.Full throttle in a low gear will pull the trailer straight again
Correct answer
B. There is generally no recovery at that point; the priority becomes stopping safely and avoiding other vehicles if any control remains
Why
A jackknife is recoverable only in its early stage, while the angle is still small and the wheels can roll again. Once the tractor and trailer have folded together, the crash has effectively happened and no steering trick will undo it.
Manual topic: Combination Vehicles - Skids and Jackknifing · From the Combination Vehicles practice bank (CV-136).