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Unformatted text preview: ◦ Implies equal curve tangents y is the roadway elevation x stations (or feet) from the beginning of the curve c bx ax y 2 BVC EVC Xp Yp L/2 L/2 L = curve length Y X Vertical Curve Geometry V Constant rate of change of Grade r r = (g 2 – g 1 ) / L R should be low (long L) for rider comfort and sight distance Equation of Curve (parabola): Y = Y BVC + g 1 X + ((g 2 – g 1 )/2L) X 2 Units: g in %, L and X in stations, Y in ft/meters Or G in fractions (0.04), L, X, Y in ft/meters...
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 Spring '08
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