1. The clearance to an obstruction is 9 m and the desirable sight distance when rounding a horizontal curve is 180 m. Determine the minimum radius of the horizontal curve. 2. A vertical summit curve has tangent grades of +2.5% and -1.5% intersecting at station 12 + 460.12 at an elevation of 150 m above sea level. If the length of curve is 182 m. Compute the length of the passing sight distance.

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A: L=182m To find passing sight distance

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.