---
title: "Commonway System"
url: "https://commonwaysystem.org/"
description: "A Pattern Language for Roads and Streets"
---

# Commonway System

One system, grounded in what's proven.

A pattern language for roads and streets, built on Vision Zero and Dutch Sustainable Safety evidence, layered on NACTO's foundation.

[Start with the Guide](https://commonwaysystem.org/guide.md) [Browse Patterns](https://commonwaysystem.org/patterns.md)

Why this guide is different

Every prescriptive claim in this guidebook traces to a cited source, and every source carries an evidence tier, so you can see how strong the backing is before you decide whether to trust it. [Learn how evidence tiers work](https://commonwaysystem.org/about/governance.md#how-disputes-over-evidence-are-resolved).

-   Legal / regulatory Legal / regulatory
-   Evidence-based Evidence-based
-   Precedent-based Precedent-based

-   ## [Guide](https://commonwaysystem.org/guide.md)
    
    Start here. How the system is put together, how patterns are classified, and how to read one.
    
-   ## [Patterns](https://commonwaysystem.org/patterns.md)
    
    Every Street Typology in the system, organized from Local to Freeway.
    
-   ## [Reference](https://commonwaysystem.org/references.md)
    
    The technical layer beneath each pattern: dimensions, criteria, specifications.
    
-   ## [Blog](https://commonwaysystem.org/blog.md)
    
    Process notes and research as the guidebook grows.
    
-   ## [About](https://commonwaysystem.org/about.md)
    
    What this is, who maintains it, how decisions get made.
    
-   ## [What's New](https://commonwaysystem.org/about/release-history.md)
    
    See what's changed recently, and what's coming next.