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Difficulty: MediumFactors Affecting Braking Distance

During a heavy rain shower, a driver notices that their vehicle takes significantly longer to come to a halt after the brakes are applied. What vehicle or environmental factor is responsible for increasing the braking distance in this situation?

  1. A
    Driver tiredness caused by driving in demanding weather conditions
  2. Severely worn tyre tread reducing the tyres' ability to disperse surface waterAnswer
  3. C
    Failing to increase the following distance to at least four seconds behind the vehicle ahead
  4. D
    Panicking and stamping abruptly on the footbrake without anti-lock brakes

Answer

Severely worn tyre tread reducing the tyres' ability to disperse surface water
Braking distance is the distance a vehicle travels from the moment the brakes are applied until it comes to a complete stop. On wet roads, tyres require adequate tread depth to channel water away from the road surface. Worn tyres dramatically reduce grip, extending the distance needed for the vehicle to stop.

Step-by-Step Solution

1
Distinguish between thinking distance and braking distance components of stopping distance.
Thinking distance depends strictly on driver reaction time (e.g., fatigue, alcohol, distractions), whereas braking distance depends on vehicle condition and road grip.
The question specifically asks about the factor responsible for increasing the distance travelled after the brakes are pressed.
2
Evaluate the effect of tyre condition on wet road friction.
Tyre tread grooves channel water away from the contact patch; worn tread leads to aquaplaning and reduced friction against the wet road surface.
Reduced friction directly degrades deceleration capability, resulting in a significantly longer braking distance.

Key Concept

Factors specifically affecting braking distance include vehicle condition (tyres, brakes, suspension, weight) and road surface conditions (wet, icy, loose gravel), as opposed to driver-related thinking factors.
Estimated Time:1m 0s
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Topics

Factors Affecting Braking Distance

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