Autodesk InfraWorks is a Windows-based conceptual design, context modeling, and visualization tool for civil infrastructure projects. Its core function is to assemble 3D context models from GIS/terrain/basemap and design data, iterate alternatives (roads, bridges, drainage concepts, traffic studies, sight lines), and present options to stakeholders early in the project lifecycle—prior to committing to detailed design and production documentation. Autodesk describes it as a front-end tool used prior to detailed design tools such as Civil 3D and Revit, with publish/exchange workflows into those products.
Key workflow emphasis (from Autodesk documentation): publishing parametric bridges/tunnels and related civil structures from InfraWorks into Civil 3D and/or Revit, with the ability to update models as changes occur.