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.

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

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

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