If V is the design speed in kmph

Answer: 4- e=V²/225R

If V is the design speed in kmph and R is the radius of the curve of a hill road, the super-elevation is e = V²/225R

Solution

We know that equation of centrifugal ratio is,

P/W = V²/127R=e+f

Where,

• P is the centrifugal force acting on the vehicle
• W is the weight of the vehicle
• V is the design speed in kmph
• R is the radius of the curve
• e is the superelevation
• f is the coefficient of lateral friction

As per IRC, provide superelevation to counteract centrifugal force due to 75% of design speed by neglecting the coefficient of lateral friction

e = (0.75V)²/127R

e = V²/225R

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