Jack Strongitharm, Autodesk Civll 3D Technical Sales Manager (UK and Ireland), has just posted a new workflow guide titled:
Design of Roundabouts using Corridor Models (Part 1 of 2)
This is a 42 page paper that gives a very thorough understanding of the major considerations for roundabout (traffic circle) design with a corridor object in Civil 3D 2007. The second part of the document will address "mini roundabouts".
Thanks Jack and all involved in the preparation of this document. I look forward to Part 2.
Note: This is officially the 300th post to this blog over the last two years. If you wish to find a post about a particular subject, doing an internet search will likely turn up past posts about the subject matter. Unfortunately, the Blogger "Search this blog" option does not search the full two years.