AutoCAD Civil 3D software is a Building Information Modeling (BIM) solution for civil engineering design and documentation. AutoCAD Civil 3D helps civil engineering professionals working on transportation, land development, and water projects stay coordinated and more easily and efficiently explore design options, analyze project performance, and deliver consistent, higher quality documentation—all within a familiar AutoCAD environment. Perform geospatial analysis and extend Civil 3D model data for stormwater analysis and interactive 3D simulations and visualizations. You can also generate quantity takeoff information and support automated machine guidance during construction. Civil 3D helps you gain the competitive advantage of BIM to deliver more innovative project solutions.

AutoCAD Civil 3D 2012 Brochure 

AutoCAD Civil 3D 2012 Comparison Matrix

More at: http://www.autodesk.com/civil3d