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5.8.5 Factors Affecting Braking Distance

Factors Affecting Braking Distance

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Braking distance depends on how effective the braking force is. Several factors can influence this distance:

  • Speed of the vehicle: The faster the vehicle is travelling, the longer the distance it will cover while braking.
  • Road and weather conditions: Wet, snowy, or icy roads decrease the friction between the tyres and the road, causing the vehicle to skid and increasing the braking distance.
  • Tyre condition: Worn tyres with reduced tread also lower friction between the tyres and the road, causing the car to skid more and increasing the braking distance.
  • Brake condition: If the vehicle's brakes are worn, the friction between the brakes and the wheels is reduced, decreasing the braking force and increasing the braking distance.

Some typical braking distances for cars at different speeds are:

Speed of carBraking Distance
20mph6m
30mph14m
50mph38m
70mph75m
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