Braking distance

The calculation of braking distance:

s: total braking distance [m] (s=sR+sF)
sR: perception reaction distance [m]
sF: braking deceleration distance [m]

Perception reaction distance:

sR=(v/3.6)tR/3.6

v: speed of vehicle [km/h]
tR: reaction time [s]

To reduce the kinetic energy to zero:

µmgsF=m(v/3.6)2/2

µ: coefficient of friction [ ] (between the tires and the road)
m: mass of vehicle [kg]
g: acceleration of gravity [9.81 m/s2]

it follows:

sF=(v/3.6)2/2µg=0.004v2

The total braking distance:

s=sR+sF

A. reaction
B. perception
C. decision
D. action

Braking distance

 
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