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April 2, 2026Michael Kinnear/2 min read

Dealing with Corridor Bow Ties in Civil 3D: Clearing and Restoring.

Master Civil 3D corridor artifacts and cleanup tools

What Are Bow Ties?

Bow ties are visual artifacts that occur in Civil 3D corridors when assemblies cross each other, typically in corners with large amounts of fill or cut. They create a characteristic shape that fans in to a point and then fans back outwards.

Common Bow Tie Scenarios

Corner Intersections

Most frequently occur at corridor corners where assemblies extend outward and cross each other. The crossing creates the characteristic bow tie shape.

Fill and Cut Areas

Large amounts of fill or cut can cause assemblies to extend beyond normal boundaries, leading to unwanted crossings and artifacts.

Extended Assemblies

When corridor assemblies extend to points and fan outward, they may intersect with adjacent assemblies creating visual distortions.

How to Clear Corridor Bow Ties

1

Select the Corridor

Click on the corridor object that contains the bow tie artifacts you want to remove.

2

Access Corridor Tools

Navigate to the Corridor Tools section in the ribbon interface to find the bow tie management options.

3

Choose Clear Corridor Bowties

Click on the Clear Corridor Bowties option, which shows an icon with radial lines crossing and fanning out.

4

Select the Region

Choose the specific region where the bow ties are occurring, and Civil 3D will automatically clear them out.

Clear vs Restore Bow Ties

FeatureClear BowtiesRestore Bowties
PurposeRemove crossing artifactsRestore overlapping links
Visual ResultClean corridor appearanceShows all assembly crossings
When to UseFinal design cleanupTroubleshooting intersections
Design ImpactMaintains design intentShows raw geometry
Recommended: Use Clear Bowties for final designs to maintain clean visual presentation while preserving design functionality.
Design Preservation

When working with bow ties, you can clean up visual artifacts without compromising your corridor design. The clear function removes overlapping display elements while maintaining the underlying design geometry.

Bow Tie Management Best Practices

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This lesson is a preview from our Civil 3D Certification Course Online (includes software & exam). Enroll in this course for detailed lessons, live instructor support, and project-based training.

In this focused tutorial, we'll examine a critical but often overlooked aspect of corridor design in Civil 3D. While we won't be creating these problematic objects from scratch in our current drawing, understanding and managing bow ties is essential for any professional working extensively with corridor modeling—particularly in complex terrain where significant cut and fill operations are involved.

Bow ties in Civil 3D represent one of the most common geometric artifacts encountered during corridor development, typically manifesting at sharp corners or transition zones. These anomalies occur when corridor assemblies extend beyond their intended boundaries and intersect with adjacent assemblies—imagine two assembly sections projecting outward from a tight curve, where the outer edges cross each other instead of terminating cleanly. The resulting shape resembles a bow tie: converging to a single point before fanning outward again, creating visual distortions and potential calculation errors in your corridor surface model. This phenomenon is particularly problematic in projects with aggressive grading scenarios, such as mountainous terrain or urban developments with constrained right-of-way limits.

Fortunately, Civil 3D provides robust tools specifically designed to address these corridor artifacts. To eliminate bow ties from your model, select the affected corridor and navigate to the Corridor Tools ribbon panel, where you'll find the Clear Corridor Bowties command. The tool's icon aptly illustrates the problem it solves—radial lines emanating from corner points that cross and extend beyond their intersection. Upon selecting Clear Bowties, you can precisely target the problematic region, and Civil 3D's algorithms will automatically resolve the overlapping geometry while preserving the corridor's design intent. This targeted approach ensures that corrections are applied only where needed, maintaining the integrity of properly functioning corridor sections.

Should your design requirements change or if you need to analyze the original corridor behavior for troubleshooting purposes, the Restore Corridor Bowties function provides a reliable path back to the uncorrected state. While we could demonstrate this by artificially introducing bow ties through profile modifications, maintaining the current design's integrity takes precedence—a principle that reflects real-world project management where design consistency and documentation control are paramount. With these bow tie management techniques in your toolkit, you're equipped to handle even the most challenging corridor scenarios with confidence.

Key Takeaways

1Bow ties are visual artifacts in Civil 3D corridors that occur when assemblies cross each other, typically at corners with significant fill or cut
2These artifacts create a characteristic shape that fans in to a singular point and then fans back outwards, resembling a bow tie
3The Clear Corridor Bowties tool allows you to remove these visual artifacts by selecting the corridor and choosing the problematic region
4The Restore Corridor Bowties function can bring back overlapping corridor links if needed for troubleshooting or design analysis
5Bow ties commonly occur when assemblies extend outward and cross adjacent assemblies, particularly in corner areas
6The corridor tools are accessible through the ribbon interface and provide visual icons showing crossing radial lines
7Clearing bow ties improves the visual presentation of your corridor without affecting the underlying design geometry
8Both clearing and restoring bow ties can be done selectively on specific regions rather than the entire corridor

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