Superelevation & its Design Formula | Advantages | Highway Engineering

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

SuperElevation / Banking of road reduces the effect of centrifugal force on the running wheels. If superelevation is not provided with 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.

Advantages of providing Super elevation:-

  1. 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.
  2. In the absence of super elevation on the road along curves, potholes are likely to occur at the outer edge of the road.
  3. The Indian road congress(IRC) has prescribed the max value of superelevation is 1 in 15.

Super Elevation formula:-

superelevation 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 superelevation (e) necessary for 75% design speed and assume No lateral friction is developed

As per practical conditions, it is suggested that superelevation should be provided to fully counteract the centrifugal force due to 75% of the Design Speed(V) by neglecting lateral friction (f=0) developed.

 

super elevation steps

SUPER ELEVATION STEP

Superelevation

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