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Calculation of Super Elevation

Super elevation, also known as cant or banking, refers to the inward transverse inclination provided to the carriageway on a curved section of road. It is designed to counteract the centrifugal force on vehicles negotiating a curved path, allowing them to travel safely without overturning or skidding. The formula provided calculates the required super elevation based on parameters like road width, curve radius, and vehicle speed.

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2K views3 pages

Calculation of Super Elevation

Super elevation, also known as cant or banking, refers to the inward transverse inclination provided to the carriageway on a curved section of road. It is designed to counteract the centrifugal force on vehicles negotiating a curved path, allowing them to travel safely without overturning or skidding. The formula provided calculates the required super elevation based on parameters like road width, curve radius, and vehicle speed.

Uploaded by

jeevendra
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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he inward transverse inclination provided to cross section of carriage way at

horizontal curved portion of the road is called as Super Elevation. It is also


referred as to Cant or Banking.

Objectives :
 To counteract the effect of centrifugal force acting on moving vehicle.
 To help a fast moving vehicles to negotiate a curved path Without
overturning and skidding.
 To ensure smooth and safe movements of passengers and goods on the
road.
 To prevent damaging effect on the road surface due to improper
distribution of load.
 The maintenance cost of road on curve is reduced.
How to Calculate Super Elevation ?
For Example : Calculate the super elevation required for road of 7 m wide on a
curve of 250 m radius for permissible speed of 80 kmph. Let the coefficient of
friction be 0.15.

The formula for calculating is given below :

Where,
e = Super elevation.
f =coefficient of friction.
v = speed in kmph.
R = Radius of the curve in metre.

Putting all the values in the formula we get,

∴ e = 0.201 – 0.15 = 0.051 per meter of carriage way.

∴ Super elevation = 0.051 * 7 = 0.357 m or 35.7 cm above the inner edge of the
road.

Minimum and Maximum Super Elevation.


 If the elevation is less than the value of camber of a road, it should be kept
equal to the camber of the road for drainage purpose.
 In case of flat curves with large radius, the super elevation will be
negligible, as the centrifugal force which will be developed will be very
small. Under such condition, the normal camber may be retained also on
the curve.
 But, such a practice will result into negative elevation on the outer half of
the road.
 The centrifugal force combined with negative elevation will be less than
allowable friction coefficient.
 Below shows the recommended radius of horizontal curves beyond which
normal cambered section may be maintained without the provision of
super-elevation.

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