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c3d-superelevation

Inspect Civil 3D alignment superelevation curves and critical stations.

3|Updated Feb 17, 2026
Search Tags:#alignment#civil3d#corridor#superelevation#critical-stations#cross-slopes
One-click install
npx skills add https://github.com/hebackus/c3d-api-plugin --skill c3d-superelevation
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: c3d-superelevation
Source: https://github.com/hebackus/c3d-api-plugin/tree/main/skills/c3d-superelevation
Command: npx skills add https://github.com/hebackus/c3d-api-plugin --skill c3d-superelevation

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Superelevation data in Civil 3D is tied to alignments and corridors, and reading it accurately requires parsing complex curves, critical stations, and cross-slopes to validate corridor behavior.

Core Features & Use Cases

  • Read alignment-level superelevation curves and critical stations via SuperelevationCurves and SuperelevationCriticalStations.
  • Inspect cross-slopes at key stations and transitions to verify attainment methods and pivot behavior.
  • Validate corridor integration by ensuring subassemblies read superelevation data correctly and corridors rebuild reflect changes.
  • Compare runoff/runout lengths and transition data across projects for QA and design reviews.

Quick Start

Open a Civil 3D project and inspect the Alignment.SuperelevationCurves and CriticalStations to review the transition data.

Frequently Asked Questions about c3d-superelevation

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I read superelevation critical stations from a Civil 3D alignment?▼

Superelevation critical stations are read by parsing the Alignment SuperelevationCurves and SuperelevationCriticalStations collections to interpret transition data and verify cross slopes.

What is the best way to validate corridor cross-slopes against superelevation data in Civil 3D?▼

Validating corridor cross-slopes involves inspecting critical station types and transition data to ensure subassemblies read superelevation data correctly and corridor rebuilds reflect design changes.

Why does my Civil 3D corridor not reflect superelevation changes at critical stations?▼

Corridors may not reflect superelevation changes if critical station types, pivot points, or attainment methods are misinterpreted, preventing subassemblies from reading cross-slope transitions correctly.

Can I compare runoff and runout lengths across Civil 3D alignment projects?▼

Yes, you can compare runoff and runout lengths by reading the superelevation transition data attached to alignments, enabling QA and design review across different projects.

How do superelevation attainment methods affect cross-slopes at design stations in Civil 3D?▼

Attainment methods determine how cross-slopes transition at design stations, requiring review of pivot points, runout and runoff lengths, and critical station types to verify corridor behavior.

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