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Question
The question consists of two statements; one labelled as 'Assertion' (A) and the other as 'Reason' (R)
    Assertion (A) : For mixed traffic conditions, the superelevation should fully counteract  the centrifugal force for the full design speed
    Reason (R) : Superelevation needed to main-tain the design speed in fully may exceed the limiting value 0.07. Further, as it is not possible to increase the radius, the speed has to be restricted.
    Examine above two statements carefully and select the correct answer from the option given below: 
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

For practical conditions IRC recommends that superelevation should be provided to fully counteract the centrifugal force due to 75% of design speed by neglecting lateral friction.

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