Stopping Distances

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Stopping Distance

Factors affecting total stopping distance:

  • looking at things - the faster the vehicle is travelling, the bigger braking force it will need to stop
  • the faster your going, the greater stopping distance 
  • total stopping distance = the distance covered in the time between the driver first spotting the hazard and the vehicle coming to a complete stop
  • reaction time = time between spotting the hazard and taking action
  • the stopping distance = thinking distance + braking distance 

1. Thinking Distance

  •  how FAST you're going - the faster you're going the gurther you'll go 
  • how DOPEY you are - affected by tiredness, drugs, alcohol and careless attitude
  • bad visability and distractions are also a big factor - rain, radio, bright lights = driver doesnt notice hazard until closer. - Doesnt affect thinking distance, but start thinking about stopping near to the hazard = more likely to crash. 
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Braking Distance

  • 2. Braking Distance 
    • how FAST you're going - faster travel, further it takes to stop
    • how good the BRAKES are - worn or faulty are bad in situations they are needed the most
    • how goot the TYRES are - minimum tread depth of 1.6mm to get rid of water in wet conditions. Leaves, diesel spills and rubbish on the road greatly increase braking distance, causing the car to skid. 
    • how good the GRIP is - dependent on 3 things...1. road surface, 2. weather, 3. tyres 
    • wet/icy roads are more slippy than dry roads.
  • Typical stopping distances:
    • 30mph = 14m Braking Distance + 9m Thinking Distance = 23m total stopping distance
    • 50mph = 38m Braking Distance + 15m Thinking Distance = 53m total stopping distance
    • 70mph = 75m Braking Distance + 21m Thinking Distance = 96m total stopping distance
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