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Why does a combination vehicle need a much gentler touch on the brakes just after rain begins?
- A.Rainwater fills the air tanks through the gladhands in the first minutes
- B.Wet drums grab harder than dry drums at first
- C.The first minutes of rain raise tire pressure sharply
- D.Oil and water mix on the surface to make the road extra slippery until the rain washes it clean
Correct answer
D. Oil and water mix on the surface to make the road extra slippery until the rain washes it clean
Why
The first rain lifts oil and grime that have soaked into the pavement, creating a slick film that later rain washes away. Braking distances grow and lockup comes easier during exactly the period when many drivers have not yet adjusted.
Manual topic: Combination Vehicles - Skids and Jackknifing · From the Combination Vehicles practice bank (CV-149).