The grade line is being developed for a six-lane freeway where a rising 2.5% grade meets a 1.5% falling grade at station 100 00. The elevation of the PVI of the two grades is 471.00 ft.a. Using a vertical curve length of 1400 ft, compute the middle ordinate of the equal-tangent vertical curve.b. Calculate elevations of the vertical curve for each station starting at the beginning of the curve (i.e., at stations 93+00, 94+00, etc.)