# Highway Alignment Designer

> Highway alignment design skill for horizontal and vertical geometry per AASHTO standards

- Skill: `a5c-ai/highway-alignment-designer` (Agent Skill)
- Install (CLI): `npx skillmds@latest add a5c-ai/highway-alignment-designer`
- Raw SKILL.md: https://api.skillmd.com/api/skills/a5c-ai/highway-alignment-designer/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: a5c-ai (https://skillmd.com/u/a5c-ai)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/a5c-ai/highway-alignment-designer

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# Highway Alignment Designer Skill

## Purpose

The Highway Alignment Designer Skill designs horizontal and vertical highway alignments including curves, superelevation, and sight distance per AASHTO Green Book standards.

## Capabilities

- Horizontal curve design (simple, compound, reverse, spiral)
- Vertical curve design (crest, sag)
- Superelevation calculation
- Sight distance analysis
- Cross-section template generation
- AASHTO Green Book compliance checking
- Design exception documentation
- Corridor modeling support

## Usage Guidelines

### When to Use
- Designing new roadways
- Evaluating existing alignments
- Checking sight distances
- Developing superelevation

### Prerequisites
- Design speed established
- Terrain classification known
- Design criteria selected
- Survey data available

### Best Practices
- Coordinate H and V alignment
- Verify sight distances
- Consider driver expectations
- Document any exceptions

## Process Integration

This skill integrates with:
- Highway Geometric Design
- Bridge Design LRFD

## Configuration

```yaml
highway-alignment-designer:
  curve-types:
    - simple
    - compound
    - reverse
    - spiral
  standards:
    - AASHTO
    - state-DOT
  output-formats:
    - xml
    - landxml
    - csv
```

## Output Artifacts

- Alignment geometry
- Superelevation diagrams
- Sight distance reports
- Design summaries