A two-lane highway (3.6 m lanes) with a design speed of 100 km/h has a 400 m radius horizontal curve connecting tangents with bearings of N75E and S78E. Determine the superelevation rate, the length of spiral if the difference in grade between the centerline and edge of traveled way is limited to 1/200, and the stations of the TS, SC, CS, and ST, given that the temporary station of the P.I. is 150+00. The length of the spiral should be rounded up to the next highest 20 m interval.