| Reflective sides » Braking distance - visibility |
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| 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/µ
The total braking distance:
s=sR+sF
A. reaction
B. perception
C. decision
D. action
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| Braking distance - calculated values |
Possible values:
µ: coefficient of friction [ ]:
new tire, dry road: 0.85-0.7
new tire, wet road: 0.65-0.2
worn tire, dry road: 1.0-0.9
worn tire, wet road: 0.5-0.1
snow, ice: 0.1 and less
reaction time [s]: 0.5-2.5
Calculated values:
conditions of calculation:
horizontal road
µ= 0.5 (medium adhesion between the tire and the roadway)
tR= 1.5 [s] (medium reaction)
Calculated results:
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