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Maximum And Minimum SuperElevation As Per I.R.C

Posted on 26th March 201923rd February 2022 By Malay Sautya

Maximum And Minimum SuperElevation As Per I.R.C

When a vehicle is moving on a curved path it is subject to an outward force known as centrifugal force. In order to counteract the effect of centrifugal force, the outer edge of the pavement is raised with respect to the inner edge.  This transverse inclination provided to the pavement surface is known as superelevation.

Maximum And Minimum SuperElevation As Per I.R.C

Superelevation generally denoted by ‘e’ and expressed as the ratio of the height of the outer edge will respect to the inner edge to the horizontal width.
Superelevation (e) = BC/AC = tanθ

Maximum Superelevation

As per IRC, the maximum superelevation in plain and rolling terrain and in the snowbound area is 1 in 15 or 4° or 7 %. On hill roads not bound by snow, a maximum superelevation up to 10% has been recommended by IRC.

Minimum Superelevation

The road surface should have a minimum camber to drain off rainwater. If the calculated superelevation is equal to or less than the camber of the road surface, then the minimum superelevation to be provided on horizontal curve may be limited to the camber of the surface.  

Read Also:

Types of Camber

Function Of Camber

Construction Procedure of  Water Bound Macadam (W.B.M) Road

 4 Steps in Bituminous Road Construction

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