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Mastering AutoCAD® Civil 3D® 2012 by Louisa Holland, Richard Graham

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Creating a Corridor Surface

A corridor provides the raw material for surface creation. Just as you would use points and breaklines to make a surface, a corridor surface uses corridor points as point data and uses feature lines and links like breaklines.

The Corridor Surface

Civil 3D does not automatically build a corridor surface when you build a corridor. From examining subassemblies, assemblies, and the simple corridors you built in the previous exercises, you have probably noticed that there are many “layers” of points, links, and feature lines. Some represent the very top of the finished ground of your road design, some represent subsurface gravel or concrete thicknesses, and some represent subgrade, among other possibilities. You can choose ...

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