The backward and forward tangent meet at station 2 + 220 is to connected to form spiral easement curve with 80m equal spirals. The deflection angle of the simple curve is 20֯֯ 45’ and its chord length is 100m. compute the stationings, the superelevations if the width of road is approximately 10m and the maximum velocity of the vehicle is 80kph, and prepare the data needed to lay out the curve by deflection method. Compute the deflection of the spiral at every 10th of the spiral. Draw the curve with appropriate scale
Please check the link below, hope here you can find the solution to your question:
https://web.engr.uky.edu/~rsouley/CE%20453/lectures/18%20Superelevation%20and%20Spiral%20Curves.ppt
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