Home › CDL Practice Tests › Combination Vehicles Questions › Question 132
How does braking hard while steering through a curve affect a combination vehicle?
- A.It has no effect because the trailer follows the tractor automatically
- B.It combines two demands on tire grip at once, making a skid, jackknife, or rollover much more likely
- C.It shortens the stopping distance compared with braking in a straight line
- D.It only matters when the trailer is carrying liquid cargo
Correct answer
B. It combines two demands on tire grip at once, making a skid, jackknife, or rollover much more likely
Why
Tires can only provide so much grip, and asking them to brake and turn hard at the same time can exceed it. Set your speed before the curve so you do not need heavy braking while the combination is turned.
Manual topic: Combination Vehicles - Skids and Jackknifing · From the Combination Vehicles practice bank (CV-132).