Vertical Curve Length Using Passing Sight Distance

Calculate the minimum curve length of a vertical curve by using passing sight distance, initial and final grade.

Vertical Curve Length Calculation Using Passing Sight Distance

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Formula Used: Lm = [ S² × (g2 − g1) ] / 864 ∀ S<Lm Lm = 2S - [ 864 / (g2 − g1) ] ∀ S>Lm Where,     Lm - Minimum Curve length     g1 - Initial grade     g2 - Final grade     S - Passing Sight Distance Minimum Curve Length

Vertical curve length calculations using passing sight distance are most useful in the design and the construction of four-lane highways.

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