The mechanical extra widening required for 10.5 m wide pavement on a horizontal curve of radius R metre is given by -

[ Where l is the length of wheel base of vehicle in metres]

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

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