A 6 lane highway has 12 ft lanes and a crown cross-slope of 0.02 ft/ft. The design speed of the road is 60 mph. The station of the PC is 20+00. Determine the station of the point where th superelevation runoff begins, the station whe the tangent runoff begins and the station where the curve is fully superelevated if the design superelevation is 6%a