A horizontal curve is planned to connect two tangents that intersect at station 250+00.00 with a
deflection angle of 15.0 degrees. The alignment is along a two-lane two-way highway. For a
design speed of 60 mph, a curve radius of 2000ft, and the maximum superelevation rate (emax ) of
10.0 percent (0.10 ft/ft), determine the following:
a. design superelevation rate
b. minimum length of superelevation runoff .