When the corridor Alignment is modified, what happens to the corridor surface?

When the corridor Alignment is modified, what happens to the corridor surface?

• A. It updates
• B. It remains unchanged
• C. It resets
• D. It becomes hidden

Answer: (A)

Corridor surfaces are tied directly to the corridor geometry along its Alignment. The corridor is a parametric construct: its surface is built from the alignment and the selected assemblies. When you modify the Alignment, the corridor path changes, so Civil 3D recomputes the surface to follow the new centerline. In practice, this means the surface updates to reflect the updated geometry (elevations, breaklines, and the overall shape). It isn’t left unchanged, reset, or hidden—just refreshed to match the new alignment. If you don’t see an immediate update, you can force it by rebuilding or updating the corridor surface.

Corridor surfaces are tied directly to the corridor geometry along its Alignment. The corridor is a parametric construct: its surface is built from the alignment and the selected assemblies. When you modify the Alignment, the corridor path changes, so Civil 3D recomputes the surface to follow the new centerline. In practice, this means the surface updates to reflect the updated geometry (elevations, breaklines, and the overall shape). It isn’t left unchanged, reset, or hidden—just refreshed to match the new alignment. If you don’t see an immediate update, you can force it by rebuilding or updating the corridor surface.