Specialist part · #6438 · 1 pts
How is braking on a wet road affected by using tyres having tread wear exceeding maximum safety limits?
aIncreased friction.
bThe shortening of the braking distance.
cDecrease of friction and the lengthening of the braking distance.
Why?
Excessively worn tread removes water from beneath the tyre less effectively, reducing grip on a wet road. The TWI arrow in the picture points to a tread wear indicator inside a groove. During braking, friction decreases and braking distance increases, so the answers suggesting greater friction or a shorter braking distance are incorrect.