How can you stop quickly on a slippery road?
- Stop braking and coast to a stop.
- Use the front brake only.
- Use threshold braking. ✓
- Use the rear brake only.
Answer: C. Use threshold braking.
To stop quickly on a slippery road, use threshold braking: apply both brakes smoothly and firmly, and ease off if a wheel starts to lock.
Why this is the answer
The handbook describes threshold braking as braking hard enough to stop quickly without locking either wheel. If a wheel locks, you release the brake for a moment so it rolls again, then reapply without reaching the lock point. In rain or on slippery surfaces it also says to avoid sudden changes in speed or direction and to use both brakes, because together they work better than the rear brake alone. Threshold braking fits that advice: firm, smooth use of both brakes with control instead of grabbing them and skidding.
Why the other answers are wrong
- A. Stop braking and coast to a stop. — Coasting after releasing the brakes gives up the braking force you need to stop quickly.
- B. Use the front brake only. — Using only the front brake leaves out the rear brake, and the handbook says both brakes together are more effective, even on a slippery surface.
- D. Use the rear brake only. — Using only the rear brake is less effective than using both brakes together when you need a quick stop.
Remember it
Think both brakes, no lock: if a wheel locks, let it roll for an instant, then brake again short of locking.