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mutcd

reference corpus · status live · domain LAW (Law and regulation) · lane A · refresh pinned · tags US · TRAFFIC · OPERATIONS

What an agent uses it for

the current MUTCD: sign and signal warrants, markings, work-zone typical applications

Use it
curl -fsSLO https://raw.githubusercontent.com/xerj-org/xerj/corpus-hub/tools/xerj-code/hub/mutcd.json
xerj corpus add --from ./mutcd.json
xerj corpus index mutcd then xerj code mutcd "your question"

Needs the xerj CLI and a local node running; the copy prompt covers both, checks each step, and shows how to stop only the node you started. No shell: the MCP tool xerj_code_search with corpus: "mutcd", once the corpus is indexed on the node.

Sources and pins

sourcepinlicencesizereview note
corpus-mutcd b70b91886a80US-government public domain (FHWA/DOT, 17 USC 105) 33.3 MB / 960 files FHWA MUTCD 11th Edition with Revision 1 (December 2025) - the edition mutcd.fhwa.dot.gov currently distributes (source page + PDF sha256 pinned in the mirror README). PDF-only lane (FHWA stopped publishing HTML with the 11th edition), extracted with pypdf and split per section: 960 files across sections/chapters, front matter and appendices. G7 graded 2026-10-04: 4/5 pass 4/5 relevant (full-stop w

33.3 MB across 960 files. Added 2026-10-04.

People behind this corpus

Upstream authors (1)

Owners of the pinned repositories, credited under each repository's licence. They have not signed up here; their pages are attribution.

xerj-org@xerj-org · upstream

All contributors.

Rights

US-government public domain (FHWA/DOT, 17 USC 105). Redistribution permitted with attribution per the licence review. The review block records a human opening each licence file at the pin. Detector output is a hint, never the verdict.

Retrieval spot-check (G7)

4.0/5 relevant. Graded .

Q: when is a STOP sign required at an intersection
expect: sections/sec-2b-04.txt
top-5: corpus-mutcd/sections/sec-4a-04.txt / corpus-mutcd/downloads/mutcd11theditionr1hl.pdf / corpus-mutcd/downloads/mutcd11theditionr1hl.pdf / corpus-mutcd/sections/sec-2b-04.txt / corpus-mutcd/sections/sec-3b-19.txt:32
grade: pass
Q: how to choose which road gets the STOP or YIELD sign
expect: sections/sec-2b-07.txt
top-5: corpus-mutcd/sections/sec-9b-02.txt:1 / corpus-mutcd/sections/sec-8c-03.txt:1 / corpus-mutcd/sections/sec-3b-19.txt:1 / corpus-mutcd/downloads/mutcd11theditionr1hl.pdf / corpus-mutcd/downloads/mutcd11theditionr1hl.pdf
grade: miss
Q: peak hour signal warrant what is it for
expect: sections/sec-4c-04.txt
top-5: corpus-mutcd/sections/sec-4c-04.txt / corpus-mutcd/sections/sec-4c-09.txt / corpus-mutcd/front-matter/toc-and-lists.txt / corpus-mutcd/front-matter/toc-and-lists.txt / corpus-mutcd/downloads/mutcd11theditionr1hl.pdf
grade: pass
Q: pavement markings for a two-way left-turn lane
expect: sections/sec-3b-05.txt
top-5: corpus-mutcd/downloads/mutcd11theditionr1hl.pdf / corpus-mutcd/sections/sec-2b-32.txt / corpus-mutcd/sections/sec-3b-05.txt:1 / corpus-mutcd/downloads/mutcd11theditionr1hl.pdf / corpus-mutcd/sections/sec-3b-05.txt:92
grade: pass
Q: dilemma zone high speed approaches yellow change interval
expect: sections/sec-4d-01.txt
top-5: corpus-mutcd/downloads/mutcd11theditionr1hl.pdf / corpus-mutcd/sections/sec-4d-01.txt / corpus-mutcd/sections/sec-6l-04.txt:62 / corpus-mutcd/downloads/mutcd11theditionr1hl.pdf / corpus-mutcd/sections/sec-4j-03.txt:62
grade: pass

Agent score

From structured reviews that AI agents send after they use this corpus: through xerj hub pull, MCP queries, or the xerj_corpus_feedback tool. Each review rates usefulness 1–5, whether the answer was found, and freshness. This is not the human hub star count shown above. The two are never mixed.

Loading agent reviews…

Score = Bayesian mean of usefulness (prior 3.0 with weight 5), so a few reviews cannot swing it. One voice per installation per corpus per week; abnormal-volume reviewers are dropped. Coverage gaps appear only once 3 or more agents report the same one. How it works.

Traffic

Traffic stats load from /api/hub-traffic when this page runs JavaScript.

Views: visits to this page (search-engine crawlers excluded). Unique: distinct visitors per day, by a hash salted with the day, so the 14-day unique figure adds up daily uniques. Pulls: growth of the GitHub release download count of this corpus’s pack (xerj hub pull downloads from there; includes our own pack-verification downloads). Searches: hosted-hub queries for this corpus. Referring sites appear after 3 views. What is collected.

Agent usage

Usage stats load from /api/hub-usage when this page runs JavaScript.

Counted: requests agents send to the hosted hub API (hub.xerj.org/api/v1/code, /def) for this corpus. Queries on your own node (xerj code, xerj ask with a local pack, the MCP tools) never leave your machine and are not counted. Templates replace identifiers, versions, paths, numbers and quoted text with placeholders; one is shown only once it has been seen 3 times in 30 days, and any word asked fewer than 3 times shows as <term>. Raw queries are never published. What is collected.