If N is the net differnece of grades, S is the minimum overtaken sight distance in metres, the length (L) of summit curve, is

- 1
  
  $\frac{N S}{4}$
- 2
  
  $\frac{N S^{2}}{4}$
- 3
  
  $\frac{N S^{2}}{4.8}$
- 4
  
  $\frac{N S^{2}}{9.6}$

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