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A Curve in the Road

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The obstruction like natural or artificial which comes in the way of straight alignment can be made easier in providing the by-pass with the help of curves. Is a curve with a gradual change in elevation on the outside of the curve to help drivers comfortably take turns at faster speeds

sight distance > curve length ( S> L) L = 2 S − 200 ( h 1 + h 2 ) 2 A L=2S-{\frac {200({\sqrt {h_{1}}}+{\sqrt {h_{2}}}) Crest vertical curves are curves which, when viewed from the side, are convex upwards. This includes vertical curves at hill crests, but it also includes locations where an uphill grade becomes less steep, or a downhill grade becomes steeper. In the case of horizontal as well as vertical, road curves should ensure safety, comfort, and convenience for traffic, while they are further classified as follows: 1.Simple Curve:

Curves are regular bends provided in the lines of communication like roads, railways, and canals to bring about a gradual change of direction. The cross section shows the position and number of vehicle and bicycle lanes and sidewalks, along with their cross slope or banking. Cross sections also show drainage features, pavement structure and other items outside the category of geometric design.

In a straight route, if costly land comes in the way, then it can be avoided by providing diversions with the help of curves.Sag vertical curves are those that have a tangent slope at the end of the curve that is higher than that of the beginning of the curve. When driving on a road, a sag curve would appear as a valley, with the vehicle first going downhill before reaching the bottom of the curve and continuing uphill or level.

A compound curve has two or more simple curves with different radii that bend the same way and are on the same side of a common tangent. In this diagram, MN is the common tangent.Find sources: "Road curve"– news · newspapers · books · scholar · JSTOR ( November 2018) ( Learn how and when to remove this template message) For the comfort and ease of drivers, there are several types of curves are provided in the road which plays an important role in the geometric design of road and railway alignment. 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). Curves provided in the horizontal plane are known as horizontal curves and are generally circular or parabolic. Curves provided in the vertical plane are known as vertical curve.

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