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
- e=V/127R
- e=V2/127R
- e=V/225R
- e=V2/225R
Table of content
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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