11 A large rock became visible to a driver at a distance of

1.1. A large rock became visible to a driver at a distance of 175 ft. Assuming perception- reaction time of 0.8sec, initial speed of 42 mph, a coefficient of friction equal to 0.5 and a level roadway, determine if the vehicle will crash or not.

Solution:-

Given

V = 42 mph = 18.66 m/s

f = 0.5

t = 0.8 second

Stopping sight distance(SSD) = Vt + V²/(2 gf)

= 18.66 x0.8 + (18.66)²/ (2x9.8x0.5)

= 50.458 meter

= 165.5 feet less than 175 feet

So vechicle will not crash

1.1. A large rock became visible to a driver at a distance of 175 ft. Assuming perception- reaction time of 0.8sec, initial speed of 42 mph, a coefficient of f

11 A large rock became visible to a driver at a distance of

Solution

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