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Washington MUTCD

Last updated June 4, 2026

A searchable, deep-linkable copy of Washington MUTCD, the Washington standard for traffic signs, signals, and pavement markings.

Washington does not publish a standalone manual; it adopts the National MUTCD 11th Edition (2023) and amends a specific set of sections via the WAC 468-95 modifications (effective October 2025). This edition shows the full manual with Washington’s amendments applied inline. Looking for the federal manual instead? See the National MUTCD 11th Edition.

We’re Roundabout Technologies, and we built this because we kept needing to search the manual, jump to a specific section, and send a teammate a link to the exact paragraph we were looking at, and it was a real pain to do so with the source PDFs. We thought others would find it useful so we made it publicly available, and we hope it’s helpful!

What Roundabout does

We build AI-powered traffic signals that use cameras to build a real-time, super-detailed 3D map of all cars, bikes, buses and pedestrians, then use that map to make optimal signal change decisions at every moment, for single intersections and across road networks. If that sounds interesting, you can subscribe to our newsletter or reach out at roundabout.tech/contact. We’d love to hear from you.

How to use this edition

Use the nav or the search box to move around Parts 1 through 9 and the appendices. Every numbered section has its own stable link, so a part page plus #4C.03 drops you right on that section. Clicking the section header copies the link to that section. The Sign Code Index maps every sign code (R1-1, W1-1, EM2-1, …) to a picture of the sign and the section that defines it.

The 24 sections, figures, and tables that Washington modifies are marked with a Washington-modified flag. Everything else is the unmodified National MUTCD.

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If you have feedback or suggestions, please let us know here: roundabout.tech/contact.

Other editions

Many states publish their own MUTCD: the federal manual adopted with state-specific amendments. We mirror these the same way, each at its own permanent link:

Unofficial convenience copy

This is not the official, controlling document. The authoritative texts are the Washington source (https://app.leg.wa.gov/wac/default.aspx?cite=468-95) and the National MUTCD from the Federal Highway Administration. We will keep this as accurate and current as we can.