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Question
Assertion (A): IRC suggests the coefficient of longitudinal friction as 0.35-0.40 depending on the speed and lateral friction as 0.15. The former is useful in horizontal curve design calculation and the latter in sight distance.
Reason (R): When the longitudinal coefficient of friction of 0.40 is allowed for stopping the vehicle, the resultant retardation is 3.93 m/sec², which is not too uncomfortable to the passengers
A.
Both (A) and (R) are true and (R) is the correct explanation of (A)
B.
Both (A) and (R) are true and (R) is not a correct explanation of (A)
C.
(A) is true but (R) is false 
D.
(A) is false but (R) is true
Answer ( Option D)

(A) is false but (R) is true

Solution

IRC suggests the coefficient of longitudinal friction as 0.35-0.40 depending on the speed and lateral friction as 0.15. The former is useful in sight distance calculation and the latter in horizontal curve design.
When µ = 0.4 
Then to stop the vehicles, brakes will be applied and the resultant retardation 
a = µg 
a = 0.4 x 9.81 
= 3.924 m/s2
Which is not too uncomfortable to passengers.

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