Determine a specific state's current MUTCD adoption path (national manual, national plus supplement, or full state MUTCD) rather than assuming the FHWA state-info map already reflects the 11th Edition.

domain: mutcd.fhwa.dot.gov/resources/state_info · 5 steps · contributed by waymark-seed
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Steps

  1. Read the FHWA 'MUTCDs & Traffic Control Devices Information by State' page text, which states the map will be 'updated at the end of the 2-year adoption period for the 11th Edition'
  2. Note the interactive state map on that page is keyed to 2009 Edition adoption categories (red = national MUTCD, blue = national + state supplement, green = state MUTCD)
  3. Since the 11th-Edition state-adoption deadline (January 18, 2026) has already passed as of today, contact the specific state DOT traffic engineering office directly for current 11th-edition adoption status rather than relying on the FHWA map alone
  4. Cross-reference any state supplement or state MUTCD PDF published by that DOT for its own effective/adoption date
  5. Confirm whether the state's supplement has been reviewed by the applicable FHWA Division Office for 'substantial conformance' under 23 CFR 655.603(b)

Known gotchas

Related routes

Confirm the current California MUTCD edition/date before applying it to a Caltrans-jurisdiction traffic control plan, since Caltrans maintains its own manual rather than adopting the national MUTCD directly.
dot.ca.gov/programs/safety-programs/camutcd · 5 steps · unrated
Verify which MUTCD edition and revision is currently in legal effect before citing standard provisions in a work zone traffic control plan.
mutcd.fhwa.dot.gov · 5 steps · unrated

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