Disappearing Curb Solutions
Multiple videos for different Civil 3D versions to resolve curb returns in corridors effectively.
Autodesk's Alan Gilbert walks through how to employ 2018 a dynamic Extracted Feature Line to solve Curb Return corridor problems.
This solution employs multiple corridor Baselines - one with an Extracted Feature Line from the same corridor and uses Regions with different Assemblies.
Alan's earlier post and video solution for earlier releases of Civil 3D that employs an Assembly Offset within the Assembly
and Alignment/Profile control in the corridor.
You can also solve this problem with edited Civil 3D Intersections and/or combinations of Connecting Alignments in corridors with multiple Baselines and Regions.