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Tuesday, 17 June 2014

Cyclist Driving Sight Distance Calculator

If you are driving and have to slow down behind a cyclist because it is not safe to overtake, how much sight-distance is required?

Braking fraction 0.7
      
1.0 is hard braking, less 0.5 soft braking
Thinking Time 0.5
      
in seconds


Visibility distance (metres) needed for Bike Speeds (mph) vs Car Speeds (mph)

Braking fraction, 1.0 is emergency stop braking based on approx rates from Highway Code. Friction=0.7
Car speed is from left to right, bike speeds increasing downwards:
Thinking times: competent reaction times are usually mush less than 1.0s
Ref: http://en.wikipedia.org/wiki/Braking_distance

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