Superelevation or Banking of Road:-
When a vehicle travels in a circular path or curved path, it is subjected to an outward force which makes a vehicle to overturn and skid due to Centrifugal force. To overcome this force and for safe travel of a vehicle, the outer edge of the road is raised above the inner edge. This is known as superelevation or banking of road.
SuperElevation / Banking of road reduces the effect of centrifugal force on the running wheels. If superelevation is not provided the entire centripetal force is produced by the friction between the vehicle’s tires and the roadway, thus results in reducing the speed of a vehicle.
- Super elevation is provided to achieve the higher speed of vehicles.
It increases the stability of fast-moving vehicles when they pass through a horizontal curve, and it also decreases the stresses on the foundation.
- In the absence of super elevation on the road along curves, potholes are likely to occur at the outer edge of the road.
- The Indian road congress(IRC) has prescribed the max value of super elevation is 1 in 15.
Super Elevation formula:-
The above formula is used only to calculate one of the missing value either e or f or v or R for design purpose consider the below procedure.
Design procedure of Superelevation / Banking of road:-
Design procedure includes following steps
Step – 1:-
Calculate the super elevation (e) necessary for 75% design speed and assume No lateral friction is developed
As per practical conditions , it is suggested that super elevation should be provided to fully counteract the centrifugal force due to 75% of the Design Speed(V) by neglecting lateral friction (f=0) developed.
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