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Select the option that is true regarding the following two statements labelled Assertion (A) and Reason (R). (A): For horizontal curves, the centr

Question

Select the option that is true regarding the following two statements labelled Assertion (A) and Reason (R).
(A): For horizontal curves, the centrifugal ratio increases along the length of the transition curve.
(R) In a horizontal curve, the superelevation is provided at an increasing rate with zero at the start to the maximum value at the end of transition curve.

Both A and R are true and R is the correct explanation of A

Both A and R are true, but R is not the correct explanation of A

A is false, but R is true

A is true, but R is false

Solution

Correct option is A

A horizontal curve is a curve in plan to provide change in direction to the central line of a road.
 When a vehicle traverses a horizontal curve, the centrifugal force acts horizontally outwards through the centre of gravity of the vehicle.
 The ratio of the centrifugal force to the weight of the vehicle, P/W is known as the centrifugal ratio or the impact factor.
 The centrifugal ratio is thus equal to
 In a horizontal curve, the superelevation is provided at an increasing rate with zero at the start to the maximum value at the end of transition curve.