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What is usually the first visible sign that your trailer is starting to jackknife?
- A.The steering wheel pulls hard to the left every time
- B.The trailer ABS lamp begins to flash rapidly
- C.You can see the trailer swinging out and appearing wider in one mirror
- D.The low air warning buzzer sounds
Correct answer
C. You can see the trailer swinging out and appearing wider in one mirror
Why
A jackknifing trailer folds toward the tractor, and the driver normally spots it first in the mirrors as the trailer swings out of line. Catching that early swing, before the angle grows, is what gives you any chance to recover.
Manual topic: Combination Vehicles - Skids and Jackknifing · From the Combination Vehicles practice bank (CV-127).