Check out the new courseware to help you with advanced corridor modeling techniques featuring a cloverleaf interchange.
AutoCAD Civil 3D 2009: Interchange Design (Solution Series) AOTC
Buy the book here:
Autodesk Official Training Courseware Book Interchange Design with Civil 3D 2009
Check out a sample chapter here:
Sample chapter from AOTC Interchange Design for Civil 3D 2009
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