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Why are bridges and shaded spots especially dangerous for jackknifing in cold weather?
- A.They can be covered with ice while the rest of the road is only wet, so braking there can suddenly lock wheels
- B.Bridges are always built with steeper grades than the road
- C.Cold air under a bridge disables the trailer ABS
- D.Ice cannot form on bridges, so drivers brake too late for the dry road after them
Correct answer
A. They can be covered with ice while the rest of the road is only wet, so braking there can suddenly lock wheels
Why
Bridge decks freeze first because cold air circulates above and below them, and shaded pavement keeps ice long after sunny stretches thaw. A brake application that was safe on wet pavement can lock wheels on that hidden ice patch.
Manual topic: Combination Vehicles - Skids and Jackknifing · From the Combination Vehicles practice bank (CV-146).