Civil Engineering - Highway Engineering - Discussion

Here, e is directly proportional to v^2 not to V.

It is directly proportionel to quare of velocity not directly proportionl to single velocity.

The formula is;

e + f= Bv2/gR.

Rate of super elevation e=E/B, & E=eB.
E = super elevated hight or superelevation.
But e = v^2/127R,
i.e E = v^2B/ 127R.

From this equation, we can conclude that super elevation (E) is directly proportional to the velocity of the vehicle, while the rate of superelevation (e) is inversely proportional to the width of the pavement (B).

I think option A is the right answer for this.

I think opt A is the actual incorrect statement. Because from the formulae E= e (rate of super elevation) * B (width of pavement) for designing super elevation, for a perticular pavement width B is same but rate of superelevation can be changed. So width is not proportional to value of superelevation (E). Again superelevation is provided for counteract centrifugal force which is ev^2/gR. So opt C is correct statement. So. Who answered opt A I will go with them.

Directly proportional to velocity square I guess that's why it's incorrect here!

Directly proportional to the velocity and also inversely proportional to the radius of curvature.

For the total amount of superelevation, A, C, and D are correct.

So, incorrect can only be B as it is proportional to the square of the speed and not the speed only.

B is the right option.

Agree @Anuj statement.