# If V is the design speed in kmph

By BYJU'S Exam Prep

Updated on: September 25th, 2023

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

1. e=V/127R
2. e=V2/127R
3. e=V/225R
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/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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