Correct Answer - Option 2 : super elevation
Concept:
As per IRC, Centrifugal force corresponding to 75 % of the design speed is counteracted by providing the super elevation on horizontal curves. IRC recommends following formula for calculation of Super elevation :
\(e = \frac{{{V^2}}}{{225R}}\)
Where
e is the super elevation
R is the radius of horizontal circular curve in ‘m’.
V is the design speed in ‘km/hr’.
Note:
1. This has been done because India has mixed traffic conditions i.e. slow moving and fast moving vehicles.
2. The Superlevation calculated using above formula should be less than maximum permissible value and shall be more than the minimum value which is the camber of road.
3. The remaining centrifugal force is balanced by friction on road.
