This tutorial demonstrates how to create a divided highway corridor. The tutorial uses some of the subassemblies that are shipped with AutoCAD Civil 3D to create a more complex and realistic highway model.
This highway has a depressed median with a flat bottom ditch and inside paved shoulders, two travel lanes on each side of the median, and paved outside shoulders. The total median width between inside edges-of-traveled-ways is 44 feet. The highway may have at-grade intersections, so the superelevation rotation point is set to be located at the design profile grade above the centerline of the median ditch. This creates a single consistent cross slope across the entire roadway in superelevated areas.