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 super elevation should fully counteract the centrifugal force for the full design speed

Reason (R) : Super elevation needed to maintain the design speed in fully may exceed the limiting value 0.07 Further, as it 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:

1.

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

2.

Both (A) and (R) are true and (R) is the not correct explanation of (A)

3.

(A) is true but (R) is false

4. (A) is false but (R) is true
5.

Answer 1

Correct Answer - Option 4 : (A) is false but (R) is true

Explanation:

Design of super elevation for mixed traffic conditions:

(i) To superelevate the pavement up to the maximum limit so that it can counteract the centrifugal force fully neglecting the lateral friction is safer for fast-moving vehicles.

(ii) But for low-moving vehicles, this may be quite inconvenient. on the contrary, to provide low value of superelevation thus relying more on lateral friction would be unsafe for fast-moving vehicles.

(iii) As a compromise, the superelevation should be provided to fully counteract the centrifugal force due to 75% of the design speed (by neglecting the friction developed) and limited the maximum superelevation to 0.07