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    The Autodesk civil engineering solution, made up of AutoCAD Civil 2009 software and AutoCAD Civil 3D 2009 software, provides civil engineers, designers, drafters, technicians, and surveyors with targeted solutions for a broad range of project types, including land development, transportation, and environmental.

    The goal of this document is to outline the fundamentals of road design through corridors while focusing on the behavior and function of assemblies and subassemblies. This paper explores the definitions and terminologies behind points, links and shapes— essential components for corridor modeling—and also addresses how subassemblies have the capability to respond to superelevation parameters when modeling complex transportation projects. Lastly, AutoCAD Civil 2009 software and AutoCAD Civil 3D 2009 software ships with a comprehensive catalog of various assemblies that can be used for a multitude of project types including road rehabilitation, highway design, local roads, and channels. This subassembly catalog has been condensed and added as a reference appendix to allow for easier exploration while highlighting the functions of each subassembly and providing common uses.