If the design speed is V kmph and deviation angle is N radians, then the total length of a valley curve in metres is given by the expression -

- 1
  
  $0.38 N V^{3 / 2}$
- 2
  
  $0.38 {(N V^{3})}^{1 / 2}$
- 3
  
  $3.8 N V^{1 / 2}$
- 4
  
  $3.8 (N V^{3})^{1 / 2}$

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