The common tangent BC of a reversed curve is 600m too long and has a bearing of S45°E. AB is tangent of the first curve whose bearing is N70°E while CD is a tangent of the second curve whose bearing is N30°E. A is the point of curvature while D is the point of tangency. If the degree of the curvature at D is 4°,   find the stationing of PC if PRC is at sta 16+420.

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Curve setting

A curve is a turn that is provided horizontally or vertically in the design of highways, railways, and runways. A curve connects two straight lines that are separated by the deflection angle. It helps to change the direction and alignment of the highways, railway tracks, and runways. Therefore, the gradual change in their alignment is made by using a curve to provide comfort to the passengers and this also provides an easy turn to change the direction of the moving vehicle.