The technology preview for the Bridge Modeler for AutoCAD Civil 3D 2010 has ended. The executable no longer operates as of March 15, 2010. Thanks to everyone who downloaded it and provided feedback.
Although Revit Structure has extensive bridge modeling capabilities, we wanted to collect your thoughts on what should be possible with AutoCAD Civil 3D. We are considering collecting more feedback on this technology in the future. Look for announcements on this blog should that occur. For now the URL for the preview takes you to the graduates page.