A horizontal curve is designed for a two-lane road in mountainous terrain. The curve has a design speed of 120 km/h, a deflection angle of 26º, and a superelevation rate of 6%. If the station of PI is (12+300), determine: a) Minimum curve radius. b) Stations of PC and PT. c) Length of superelevation runoff. d) Also, draw a neat sketch for the superelevation development from the normal crown section, where the normal crown slope is 2%, to the fully superelevated section by rotating the section around the centerline. Show all relevant distances and stations on this sketch. Assume lane width, w = 3.6 m; maximum relative slope between pavement edge and centerline in the superelevation runoff, s = 0.38%
A horizontal curve is designed for a two-lane road in mountainous terrain. The curve has a
design speed of 120 km/h, a deflection angle of 26º, and a superelevation rate of 6%. If the station
of PI is (12+300), determine:
a) Minimum curve radius.
b) Stations of PC and PT.
c) Length of superelevation runoff.
d) Also, draw a neat sketch for the superelevation development from the normal crown
section, where the normal crown slope is 2%, to the fully superelevated section by
rotating the section around the centerline. Show all relevant distances and stations on
this sketch. Assume lane width, w = 3.6 m; maximum relative slope between pavement
edge and centerline in the superelevation runoff, s = 0.38%
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