All about Civil 3D spirals

Various transition curves are used in civil engineering to gradually introduce curvature and superelevation between both tangents and circular curves as well as between two circular curves with different curvature.


Use this command in situations where you need to create a single compound spiral solution as a transition between two curves with different radii. Because free spirals have only one geometric solution, you cannot specify length or A value. The program makes the calculation.

Add a free spiral between two lines in situations where you want the spirals to maintain tangency to the lines they are attached to. For this solution, the spirals are simple, incurve, or outcurve.

Ref : Autodesk AKN

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