SAG Vertical Curve Calculator

Sight Distance
Initial Roadway Grade
Final Roadway Grade
Height of headlight
Angle of Headlight Beam

Utilize our complimentary online tool to compute SAG vertical curve dimensions. Input the following parameters: Sight Distance, Roadway Grade, Headlight Height, and Headlight Angle.

Find the necessary length for the SAG vertical curve by entering values for sight distance, roadway grade, headlight height, and headlight beam angle. This calculation will yield the essential SAG curve length to ensure optimal visibility and safety according to the parameters.

SAG Vertical Curve formula

    \[Lm = \frac{A \times S^2}{200 \times (H + S \times \tan(\beta))}\]

    \[Lm = 2S - \frac{200 \times (H + S \times \tan(\beta))}{A}\]

The variables used in the formula are:

A – Absolute difference between g2 and g1

S – Sight Distance

Lm – Minimum Curve Length

H – Height of headlight

β – Angle of Headlight Beam

SAG Vertical Curve Calculator

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