The road has convexity upward, with the highest point in the centre in the straight portion of the road. The highest point on the surface is called crown.
Definition of Road Camber
The word “Camber” is defined as the slope of the line joining the crown and the edge of the road surface.
Thus a camber of 1 in 30 means that for a 30 meter wide road the crown of the road will be ½ meter above the edge of the road of for 60 meter wide road the crown will be 1 meter above the edge of the road. The camber is also sometimes called as cross fall or cross slope.
What is Road Camber
The curved road surface has convexity upwards like the back of a tortoise; this convexity can be seen in the cross section of a road surfacing and is usually called camber of the roads.
The main object of providing the camber is to drain off rainwater from the surface of the road as quickly as possible. Hence a hard smooth surface will require less camber than a soft and rough surface.
The amount of cross fall or camber depends on the rainfall of threat particular locality in which the road is to be constructed and the permeability of the road surfacing material. The steeper the camber is, the more inconvenient it is for the traffic. In roads having steeper camber, the control portion of the road surface will deteriorate.
The following camber have been recommended for different road surfaces.
Recommended Values of Road Camber
Type of Road
|1 in 20|
|1 in 24|
|1 in 24 to 1 in 30|
Water bound macadam road
|1 in 30 to 1 in 48|
|1 in 48|
Bituminous concreter sheet asphalt
|1 in 60|
Cement concrete roads
|1 in 70 to 1 in 80|
|1 in 48 to 1 in 60|
Types of Road Camber
In general three types of cambers are provided for roads surface.
- Barrel camber
- Sloped camber
- Composite camber
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