Civil 3D should introduce a tool similar to the surface corridor creation feature available in OpenRoads Designer. For irregular, non-rectangular, or island areas, users should be able to create a corridor more easily and efficiently.
A feature similar to OpenRoads would allow users to apply any template (assembly) directly to a defined area and generate a corridor quickly with minimal setup. In Civil 3D, multiple targets must currently be defined, and during conversion to solids, some solids may fail to generate properly.
If Civil 3D could implement a more streamlined area-based corridor modeling option, it would significantly improve efficiency and make corridor modeling easier and more reliable for all users.