Crest Vertical Curve Length Calculator

Sight Distance
Initial Roadway Grade
Final Roadway Grade
Height of driver's eye above Roadway surface
Height of object above Roadway surface

Utilize our complimentary online tool to compute the length of a crest vertical curve. Input the following parameters: Distance, Initial Grade, Final Grade, Height.

This calculator calculates the essential length of a crest vertical curve, which is particularly valuable in roadway design. It addresses situations where the line of sight may surpass or fall short of the curve’s length requirement.

Crest Vertical Curve Length formula

    \[L_m = \frac{{A \times S^2}}{{200 \times (\sqrt{h_1} + \sqrt{h_2})^2}} \quad \forall \, S < L_m\]

    \[L_m = 2S - \left( \frac{{200 \times (\sqrt{h_1} + \sqrt{h_2})^2}}{{A}} \right) \quad \forall \, S > L_m\]

The variables used in the formula are:

A – Absolute difference between g2 and g1

S – Sight Distance

Lm – Minimum Curve Length

h1 – Height of driver’s eye above roadway surface

h2 – Height of object above roadway surface

The calculation of a convex-shaped vertical curve is made simpler with the help of the Crest Vertical Curve Length Calculator.

Crest Vertical Curve Length Calculator

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