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

- 1
  
  $e = \frac{V}{127 R}$
- 2
  
  $e = \frac{V^{2}}{127 R}$
- 3
  
  $e = \frac{V^{2}}{125 V}$
- 4
  
  $e = \frac{V}{225 V}$

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