Road curve

Similar curves are on railways and canals.

Curves provided in the horizontal plane are known as horizontal curves and are generally circular or parabolic.

Five types of horizontal curves on roads and railways: Two types of vertical curves on roads: A simple curve has the same radius throughout and is a single arc of a circle, with two tangents meeting at the intersection (B in this diagram).

In this diagram, MN is the common tangent.

It is used when it is necessary to deviate from a given straight path to avoid intervening obstructions such as a building, a body of water, or other significant site.