The design speed of the Road is 60 kmph. Assume Reaction time of the driver as 2.5 sec and Co-efficient of friction as 0.6. Brake efficiency is 50%.

Given data:

V = 60 Kmph

t = 2.5 seconds

f = 0.6 and brake efficiency is 50%

As the brake efficiency is 50% the wheels will skid through 50% of the braking distance and rotate through the remaining distance. Therefore, the value of coefficient of friction developed (f) may …