VERTICAL CURVES IN ANY VERTICAL CURVE: I c„ AL E 8 y= (D)2 —i— 2 1 1 ' (1/2 L) y»D2 A- 2L Л WHERE: G. G = TANGENT GRADES. IN % E ■ ORDINATE FROM P.I. TO CURVE, IN FEET. A = Gv G2. THE ALGEBRAIC DIFFERENCE IN GRADE L ■ LENGTH OF CURVE, IN STATIONS Y = ORDINATE FROM