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Maximum and minimum superelevation in road as per IRC

Maximum and minimum superelevation in road as per IRC | what is superelevation in road | definition of superelevation | maximum superelevation for plain, rolling terrain, urban, snowbound and hilly terrain | minimum superelevation in road.

When any motor vehicle such as truck, buses, motorcycles & others is moving on horizontally a curved surface of road or pavement, they experience to an outward force known as centrifugal force. In order to counteract the effect of centrifugal force acting on wheels of vehicle, the outer edge of the pavement or road is raised with respect to the inner edge of road. This transverse inclination provided to the pavement surface or road is known as superelevation. It is also known as Cant or Banking.

Maximum and minimum superelevation in road as per IRC
Maximum and minimum superelevation in road as per IRC

Superelevation in road is defined as transverse inclination provided to the curve portion of road in which the outer edge of road or pavement is raised with respect to inner edge. Thus it providing a transverse slope throughout the length of curve of road to ensure safely passes of fast moving vehicles without overturning and skiding.

Generally superelevation in road is denoted by “e” and it is expressed as the ratio of the height of outer edge of road or pavement with respect to inner edge to the horizontal width. So formula for calculation of superelevation in road is e = rise/run = TanΘ.

Main objective and purpose of providing superelevation in road is that it help the fast moving vehicles safely passes through the curved portion of road with stability without overturning and skiding, to counteract the effect of centrifugal force acting on wheels of moving vehicles and to prevent the damaging effect on the surface of road due to improper distribution of load on the road.

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Maximum and minimum superelevation in road as per IRC

In india, as per the rules & guidelines of Indian Road Congress (IRC), generally maximum superelevation in road is 1 in 15 to 1 in 10 (7% to 10%) and minimum is about 1 in 50 to 1 in 25 (2% to 4%) provided in curved surface of Road or pavement

Maximum superelevation in road as per IRC:- in india, as per the rules & guidelines of Indian Road Congress (IRC), generally maximum superelevation in road is 1 in 15 or 4° or 7% provided for plain, rolling terrain and snowbound area. For hilly terrain road which do not bound by snow maximum super elevation is about 1 in 10 or 10% is allowable and for urban Road it is about 1 in 25 or 4% is permissible.

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Maximum and minimum superelevation in road as per IRC

Minimum superelevation in road as per IRC:- in india, as per the rules & guidelines of Indian Road Congress (IRC), generally minimum superelevation in road is 1 in 50 to 1 in 25 (2% to 4%) provided for plain, rolling terrain and snowbound area. Value of minimum superelevation in road is just equal or nearer to value of camber or slope of road to ensure safely passes of fast moving vehicles and drain off rainwater from surface of road.

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