Equilibrium Superelevation & Superelevation As Per IRC 2.16

Equilibrium Superelevation:

Equilibrium Superelevation
Equilibrium Superelevation

Equilibrium superelevation is that superelevation at which pressure at the inner and outer tyre will be equal. if the coefficient of friction is neglected i.e. f =0 then,

e=\(\frac{V^{2}}{127R}\)    , V in km/h

This means that if a road surface is super elevated by tan-1\(\frac{V^{2}}{127R}\)  then the friction force will not be called upon to act and thus the pressure on both the wheel will be equal.

eequilibrium =\(\frac{V^{2}}{127R}\) 

If the superelevation provided is less than eequilibrium lateral fiction will come into play and will go on increase as the superelevation gets reduced.

Note⇒ Due to equilibrium superelevation:

  • No overturning, No Toppling, No Skidding, No Sliding.
  • Pressure at the inner and outer tyre will be equal.

Superelevation As Per IRC

1.Maximum Superelevation

Type of RoadMaximum Superelevation (emax)
Urban Road4% or 0.04
Plain & Rolling Terrain7% or 0.07
Mountainous & Steep Terrain10% or 0.10

2.The minimum superelevation

It is provided on a road must not be less than the camber of the road for the adequate drainage of water from the surface.


For Detailed Analysis of Highway Engineering Step By Step.

Highway Engineering

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