Open the file in Subassembly Composer, ensure a closed link loop exists, and assign a valid code (e.g., "Pave1") to the shape profile. If you want to refine your workflow further, let me know:
Files are often reviewed and critiqued by Autodesk Expert Elites. 2. State Department of Transportation (DOT) Country Kits
: The engineering community is generous. A simple search for "Civil 3D subassembly PKT" on GitHub will reveal a number of repositories. One notable example is a collection of over 500 raw subassemblies made available by Quentin Marquette.
Start with the for standard roads, visit GitHub for the weird stuff, and learn Subassembly Composer for the unique problems.
Files uploaded by expert users, Autodesk employees, and BIM managers.