8 Easy Steps on how to use Feature Lines to Design a Curb Return in a Corridor | Civil 3D

  1. Begin with your curb returns as Polylines.
  2. Go to the ribbon à "Feature Lineà "Create Feature Line from Object" and select both curb return polylines.
  3. After selecting both, hit "Enter", pick a style, erase the existing entities (optional), and put it on a site.

    Create feature lines in Civil 3D

  4. Assign the elevations from the finished grade (You can also change the grade of the curb return afterwards by selecting the feature lines and using the "Set Grade/Slope between Points" tool.)

    Set grade / slope between points in Civil 3D

  5. Select your corridor à right click, select "Corridor Propertiesà "Parameters" tab à "Add Baselineà

    Add baseline in Civil 3D

     Select "Feature Line" and name each curb return à right click on your new baseline(s), "Add Regionà select your assembly.
    Add region in Civil 3D

  6. If this happens (don't worry, it's common):

    Curb return in a corridor in Civil 3D

     You can select a different assembly or change the direction of the feature line: select feature line à "Edit Geometry" in ribbon à click "Reverse". 
     Reverse geometry in Civil 3D

  7. You will then want to target some items.  Select corridor à "Edit Targets" in ribbon

    Edit corridor region targets in Civil 3D

     click inside the region à target for width (select 2 lines: north, south and east, west)

    Select alignment in Civil 3D

     and target for elevation. This will target both alignments and profiles. 
      Set slope or elevation target in Civil 3D 
    Target alignment and profiles in Civil 3D

  8. Repeat steps 5 - 6 for the opposite curb return. When you reverse the feature line, match the parameters: Select corridor à "Match Parameters" in ribbon and match the parameters from left to right and hit "Enter".

    Match parameters in Civil 3D

     This applies the same targeting to the north, south and east, west lines so you don't have to do it twice.

    Curb return in a corridor
And there you have it! For more explanation on this, feel free to visit our YouTube channel and watch the full tutorial there!