Home › CDL Practice Tests › Combination Vehicles Questions › Question 147
A sudden, sharp lane change at highway speed is risky for a combination vehicle mainly because it can:
- A.Disconnect the electrical cord between tractor and trailer
- B.Cause the gladhand seals to blow out from the steering motion
- C.Start the trailer swinging or rolling, since the trailer reacts later and more strongly than the tractor
- D.Lock the sliding tandem in the wrong position
Correct answer
C. Start the trailer swinging or rolling, since the trailer reacts later and more strongly than the tractor
Why
The trailer lags behind the tractor's steering input and then whips to catch up, which can grow into a sway, a jackknife, or a rollover. Smooth, early lane positioning avoids exciting that pendulum effect.
Manual topic: Combination Vehicles - Skids and Jackknifing · From the Combination Vehicles practice bank (CV-147).