Using a Feature Line as a Width and Elevation Target
You’ve gained some hands-on experience using alignments and profiles as targets for swale, intersection, and cul-de-sac design. Civil 3D adds options for corridor targets beyond alignments and profiles. You can use grading feature lines, survey figures, or polylines to drive horizontal and/or vertical aspects of your corridor model.
Dynamic Feature Lines Cannot Be Used as Targets
It’s important to note that dynamic feature lines extracted using the Feature Lines From Corridor tool can’t be used as targets. The possibility of circular references would be too difficult for the program to anticipate and resolve.
Imagine using an existing polyline that represents a curb for your lane-widening ...