When you're driving on a slippery road, hard braking may cause
- (a) your wheels to lock up.
- (b) your brakes to fail.
- (c) your vehicle to skid or jackknife.
- (a) and (c) ✓
Answer: D. (a) and (c)
Hard braking on a slippery road may cause your wheels to lock up and your vehicle to skid or jackknife.
Why this is the answer
The handbook says that pressing the brake too hard on a slippery road can lock the wheels. Once the wheels lock, the vehicle can skid or a tractor-trailer can jackknife. So both the wheel lock-up and the skid or jackknife belong in the answer. Brake failure is not listed as a result of hard braking.
Why the other answers are wrong
- A. (a) your wheels to lock up. — Wheel lock-up is part of what happens, but this choice leaves out the skid or jackknife that can follow.
- B. (b) your brakes to fail. — The passage does not say hard braking makes the brakes fail; it describes wheel lock-up and loss of control.
- C. (c) your vehicle to skid or jackknife. — A skid or jackknife can follow, but this choice leaves out the wheel lock-up that starts the problem.
Remember it
Picture the sequence: too much brake on slick pavement, wheels lock, then the rig slides or folds.
Official handbook: ICBC Driving Commercial Vehicles, 2 Heavy vehicle braking – Braking, p. 25