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# Curves Curves

The curves are provided on highway to change the direction either horizontal or vertical plane in gradual way.
The necessity of providing curve arises due to the following reasons:

1)Topography of the country
2)To provide access to a particular locality
3)Restriction imposed by some un avoidable reasons of land
4)Preservation of existing amenities
5)Making use of existing right of way

The various factors which affect the design of curve are as follows:

1)Design speed of vehicle
2)Allowable friction
3)Maximum super elevation

## Classification of Road Curves

The curves are divided into two classes

### (v)  Horizontal Curves

Horizontal curves are simple, compound and reverse curves. A curve which consist of a single arc connecting two straights is called a simple curve, a curve which consist of a series of two or more than two simple curve that tern in the same direction is called as compound curve, a curve consist of two simple curve of opposite direction is known as compound curve.

### (v)  Vertical Curves

Following are two types of vertical curves:

• Summit curve
• Valley curve 