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Why can a trailer roll over even when the tractor stays upright?
- A.Trailers have no brakes
- B.Tractors cannot roll over
- C.Trailer tires are always underinflated
- D.The trailer's rollover threshold is lower than the tractor's, and amplified sideways forces act most strongly on the trailer
Correct answer
D. The trailer's rollover threshold is lower than the tractor's, and amplified sideways forces act most strongly on the trailer
Why
A trailer sits higher, is often top-heavy, and receives amplified lateral forces. It can pass its tipping point while the lower, more stable tractor still feels secure to the driver.
Manual topic: Combination Vehicles - Rollover and Rearward Amplification · From the Combination Vehicles practice bank (CV-065).