Civil 3D Superelevation

Use this skill when reading superelevation data, querying cross slopes at stations, working with critical stations, or understanding superelevation's relationship to corridors and subassemblies.

Superelevation Overview

Superelevation is the banking of a roadway through horizontal curves to counteract centrifugal force. In Civil 3D, superelevation data is attached to an Alignment and consumed by a Corridor to shape cross sections through curves.

The workflow is:

1. Alignment defines the horizontal geometry (curves where superelevation applies)
2. Superelevation wizard (UI) calculates transition stations and cross slopes
3. Superelevation data is stored on the alignment as curves with critical stations
4. Corridor reads superelevation data via superelevation-aware subassemblies
5. Subassemblies adjust lane/shoulder slopes at each station based on the data

Key relationships:

• Superelevation is a property of alignments, not corridors
• Corridors consume superelevation data through their baseline alignment
• The superelevation wizard is a UI operation — the .NET API is for reading computed results