If L is the length of a moving vehicle and R is the radius of curve, the extra mechanical width b to be provided on horizontal curves,

- 1
  
  $\frac{L}{R}$
- 2
  
  $\frac{L}{2 R}$
- 3
  
  $\frac{L^{2}}{2 R}$
- 4
  
  $\frac{L^{3}}{2 R}$

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