Two tangents having an azimuth of 240° and 282° are connected by an 80-m spiral curve with a 6° circular curve. The width of the roadway is 10m. If the design velocity is 60kph. a. Determine the design superelevation. b. Determine the deflection angle at the endpoint of spiral at SC. c. Determine the external distance.

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A: Given, Length (Ls) = 260 ft  Degree (D) = 4

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Q: A spiral curve 80-meter length connects a tangent with a 6° circular curve. If the stationing of the…

A: Solution Given Data L=80 m=262.467 ft Ls=L100=262.467100=2.625 ftDc=60

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.