About Corner Cleanup for Corridors

Where corridor tangents intersect at a corner, and where the corridor is created at a fixed width, the inner and outer corners of corridors are cleaned up automatically. In other situations, such as when the corridor is created at a non-fixed width (such as when daylighting to a surface) or when there are curves in the corridor baseline, you may need to clean up the corners by extracting a dynamic feature line from the corridor and then grading from the feature line.

Conditions where corridor cleanup behavior is applied

The AutoCAD Civil 3D 2017 corridor cleanup behavior is applied in the following conditions:

In AutoCAD Civil 3D 2017, where corridor tangents intersect at a corner, and where the corridor is created at a fixed width, the corners are cleaned up as follows:

The point where the inner corners meet is calculated and radial lines are extended from that location, using the insertion frequency along the baseline as defined in the Frequency to Apply Assemblies dialog box.

In addition, one station is also added at the corner:

The subassembly width value is overridden at the radial stations; the width is calculated to produce a corner solution that is similar to the AutoCAD Offset command.

Conditions where corridor cleanup behavior does not apply

The AutoCAD Civil 3D 2017 corridor cleanup behavior does not currently apply in the following conditions:

Resolving corner cleanup issues

To resolve corner issues, you can extract a dynamic feature line from the corridor and use the grading tools to grade from that feature line. The following is an example of adding grading to the right side of the corridor.