A sag vertical curve is to be designed to join a -5% grade to a 2% grade. If the design speed is 70km/h, a) Calculate the SSD. b) Determine the minimum length of the curve that will satisfy all criteria and discuss the cases where SL. Assume a-3.414m/s² and perception-reaction time equal to 2.5 sec. Consider the worst-case grade of G=-5%. انوری

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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.