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

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Roundabouts: The Mount Everest of Corridors

If you really understand what went on earlier in this chapter, you are almost ready for roundabout design. You may want to wait to tackle your first roundabout until after reading Chapter 15, “Grading.”

The same concepts apply to a roundabout as for a standard road junction, but you will have several more regions, baselines, and corresponding profiles.

This section will help you prepare files for roundabout design. A roundabout is best done in several corridors:

  • Preliminary corridor for circulatory road
  • Main corridor with approaches and circulatory road
  • Curb island corridors (optional)

Drainage First

Based on your existing ground surface, determine the general direction that you want water to flow ...

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