Before you create corridors, you must have existing data, such as existing ground surfaces, alignments (centerlines), profiles (vertical alignments), and typical sections (assemblies).
| Build the existing ground surfaces | Surfaces are used to derive alignments and profiles, and for corridor grading. |
| Design the horizontal alignments | Alignments are used by a corridor as its centerline. |
| Create the profiles | Use existing ground profiles and design finished grade profiles (vertical alignments). |
| Calculate superelevation or cant |
Calculate superelevation for the curves on the baseline alignment. Important: All calculations should be finalized before they are applied to the corridor model. Changes in a corridor baseline alignment are not reflected in calculations. Changing the design criteria does not update the corridor model.
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| Plan the required assemblies | Before creating an assembly, identify the different types of subassemblies you need. |
| Create and maintain the required assemblies | Use subassemblies to build the required assemblies. |