Note: If your answer is other than given options please leave it question. A vertical highway curve has an approach grade of +8% meeting -6% grades at the vertex. It is required to connect the two tangents with unsymmetrical vertical parabolic curve. The curve has an offset of 1.50 m. directly below the intersection of the tangents. Locate the position of the summit from the P.T. The vertical curve has a length of 120 m. on the side of the P.C. and 90 m. from the P.T. a. 60 m. b. 50 m. c. 30 m. d. 45 m.   need solution and explanation.

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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.