A four-lane undivided highway has a lane width of 12 ft. a design superelevation of 8%, and a normal crown of 2%. This highway will curve to the right and the superelevation will be attained by rotation about the centerline and using the one-third and two thrid rule. The length of the simple curve is 980 ft. The station of PC is (120+65) and its elevation (as the road centerline) is 400 ft. Calculate the transition length and the length of the full superelevated portion of the curve?
a. 398.4 ft 767.52 tt
b. 79.68 ft: 980 ft
c. 399.52 ft 400 ft
d. 318.72 ft: 106.24 ft