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Parabolic Curves

Parabolic curves find there usage when we have to connect sections of highways or railroads of differing gradient. The use of a parabolic curve provides a gradual change in direction along the curve. Continue Reading »

Circular Curves

The most common type of horizontal curve used to connect intersecting tangent (or straight) sections of highways or railroads are Circular curves. In most countries, two methods of defining circular curves are in use: the first, in general use in railroad work, defines the degree of curve as the central angle subtended by a chord of 100 ft (30.48 m) in length; the second, used in highway work, defines the degree of curve as the central angle subtended by an arc of 100 ft (30.48 m) in length. Continue Reading »