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As per IRC in heavy rainfall regions, the minimum camber provided on bituminous roads shall be of
2%
3%
4%
50%
50%
According to the IRC (Indian Roads Congress) standards for road design, the camber (cross-slope) of a road varies based on the surface type and the amount of rainfall. For a bituminous road in a heavy rainfall region, the recommended minimum camber is 2.50% to ensure efficient drainage of rainwater from the pavement surface.
According to the IRC (Indian Roads Congress) standards for road design, the camber (cross-slope) of a road varies based on the surface type and the amount of rainfall. For a bituminous road in a heavy rainfall region, the recommended minimum camber is 2.50% to ensure efficient drainage of rainwater from the pavement surface.
Camber=n1тАЛ or Camber%=n1тАЛ├Ч100, where 1:n is the cross-slope ratio.
The primary objective of providing camber is to facilitate rapid surface drainage to minimize moisture infiltration into the road structure, which can cause damage to the subgrade and weaken the binder. In heavy rainfall areas, a steeper slope is required compared to light rainfall regions to prevent water stagnation, hydroplaning, and surface deterioration.
Camber is essential for shedding surface water to the roadside drains.
IRC sets different camber values for different pavement surfaces (Concrete, Bituminous, Gravel, Earth).
Heavy rainfall regions require higher camber to prevent water accumulation.
For bituminous roads, heavy rainfall requires 2.5%, whereas light rainfall requires 2.0%.
Reduces the risk of hydroplaning for vehicles.
Prevents structural damage due to water seepage into the base course.
Extends the service life of the pavement surface.
Excessive camber can lead to discomfort for vehicle occupants.
High cross-slopes may cause heavy vehicles to slide laterally on slippery surfaces.
Can increase edge wear on unevenly loaded vehicles.
National Highways and State Highways design.
Urban road drainage planning.
Flexible pavement construction.
Light rainfall (Bituminous): 2.0%
Heavy rainfall (Bituminous): 2.5%
Option A (2%) is the standard for light rainfall areas on bituminous roads, hence it is incorrect for heavy rainfall specifications.
D is correct тАФ The IRC standard specifies a minimum camber of 2.50% for bituminous roads in heavy rainfall regions to ensure effective drainage.
Always distinguish between light and heavy rainfall categories in IRC tables, as exam questions often swap these values to test attention to detail.