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Highway Engineering - Engineering

Q1:

Pick up the incorrect statement from the following. The super-elevation on roads is

A directly proportional to width of pavement

B directly proportional to velocity of vehicles

C inversely proportional to acceleration due to gravity

D inversely proportional to the radius of curvature.

ANS:B - directly proportional to velocity of vehicles

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).