The standard equation of cubical spiral transition curve provided on roads, is

- 1
  
  $y = \frac{l^{2}}{6 R L}$
- 2
  
  $y = \frac{x^{3}}{6 R L}$
- 3
  
  $y = \frac{x^{2}}{6 R L}$
- 4
  
  none of these

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