Home › CDL Practice Tests › Combination Vehicles Questions › Question 85
On a downgrade curve, why is a combination at higher risk?
- A.Downgrades make trailers lighter in a helpful way
- B.Gravity adds speed while the curve adds sideways force, and braking in the curve can lock wheels or shift weight forward
- C.Curves on hills are always banked for trucks
- D.Risk is lower because speed is easier to control
Correct answer
B. Gravity adds speed while the curve adds sideways force, and braking in the curve can lock wheels or shift weight forward
Why
The hill tries to increase speed exactly where the curve punishes speed. Choosing the right gear and speed before the descent keeps you from braking hard inside the curve.
Manual topic: Combination Vehicles - Rollover and Rearward Amplification · From the Combination Vehicles practice bank (CV-085).