11 Vertical Curves

# 11 Vertical Curves - ◦ Implies equal curve tangents y is...

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Vertical Curves CE 111

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Horizontal Curves Vertical Curves
Crest Vertical Curves G 1 G 2 PVI PVT PVC Line of Sight

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Design Controls for Crest Vertical Curves from AASHTO’s A Policy on Geometric Design of Highways and Streets 2001

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Stationing Horizontal Alignment Vertical Alignment
Vertical Curve Fundamentals Parabolic function Constant rate of change of slope

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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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11 Vertical Curves - ◦ Implies equal curve tangents y is...

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