Short answer: your state decides, and states genuinely disagree with each other. There is no federal table mapping sign classes to ASTM Types, and any supplier page that publishes one has invented it.
That is worth stating bluntly, because “regulatory signs = Type III, guide signs = Type IX” style tables circulate widely and they are not sourced from anything. If you need the Types themselves defined first, see ASTM D4956 sheeting types explained.
Why there is no federal answer
The MUTCD sets performance floors, not material specifications. Section 2A.21 requires signs to be retroreflective. Section 2A.22 requires agencies to maintain them above the minimum levels in Table 2A-5. That table is indexed by colour combination, by beaded-versus-prismatic construction, and by overhead-versus-post mounting — not by sign class, and its prismatic column names no ASTM Type at all. The detail is in MUTCD retroreflectivity requirements for signs.
Caltrans reached the same conclusion in its February 2026 survey, quoting the underlying research position directly: “there are no definitive rules for selecting sign sheeting.”
The proof: what states actually specify
Thirteen state DOTs responded to Caltrans Preliminary Investigation PI-0391: Arizona, Connecticut, Georgia, Indiana, Maryland, Michigan, Missouri, Ohio, Oregon, Pennsylvania, Tennessee, Utah and Virginia. Iowa did not respond; its practice below is taken directly from Iowa DOT Standard Specification Section 4186.
| State | Practice |
|---|---|
| Arizona | Type 11 listed on ADOT’s Approved Product List. Notably, Arizona was the only responding agency that did not report that Type XI eliminates the need for sign lighting |
| Connecticut | Type IX generally, Type XI for some overhead. Not a routine Type XI user |
| Georgia | Type IX for white, green and brown; Type XI for yellow |
| Indiana | Type XI permitted since 2019; no documented installations reported |
| Maryland | Type XI since 2009; reports brightness diminished about 30% in three years |
| Michigan | Type XI since 2007; service life extended from 15 to 18 years |
| Missouri | Type IV non-fluorescent; Type XI fluorescent |
| Ohio | Type IV except fluorescent yellow and yellow-green, which are Type XI (the source wording is ambiguous as to one colour or two) |
| Oregon | Type XI permitted since 2019; manual permits Type IX or XI for overhead |
| Pennsylvania | Types III, IV, VIII, IX and XI all permitted — the sign fabricator selects |
| Tennessee | Specifies by AASHTO M 268 Type D for larger extruded and overhead signs |
| Utah | Meet or exceed ASTM D4956 Type XI for permanent signs |
| Virginia | Type XI for unlit overhead; Type IX for illuminated overhead |
| Iowa (not a survey respondent) | Type XI for all signs with white, green, red, blue or brown background unless otherwise specified — Standard Specification 4186.03(B)(1)(a) |
Pennsylvania alone falsifies any national table — five Types permitted with fabricator discretion. And Tennessee specifies in a different standard’s notation entirely.
Iowa’s specification shows the same variation at the sign-class level within one state: Type XI for permanent white, green, red, blue and brown backgrounds; Type XI fluorescent for yellow and yellow-green; Type VIII or XI rigid orange for Interstate and primary work zones; Type IV rigid orange for work zones on other highways; Type VI flexible for roll-up.
How the approval process actually works
Two separate acts that get conflated constantly.
AASHTO tests. The programme formerly known as NTPEP — now AASHTO Product Evaluation and Audit Solutions — runs test decks and audits, including a dedicated Sign Sheeting Materials / Roll-Up Signing Materials technical committee. Results are published in DataMine for member agencies.
States approve. The programme’s own operations guide is unambiguous: “AASHTO Product Evaluation & Audit Solutions testing/assessments do not imply acceptance of the product. Acceptance is the responsibility of the member agency.” (The 2021 edition carried the same sentence under the NTPEP name.)
So the sequence is: manufacturer submits to a test deck → data goes to DataMine → each state DOT independently decides whether to list the product → contractors may only furnish listed products.
Real approved-products lists
| State | List | What it shows |
|---|---|---|
| Connecticut | CTDOT Qualified Product List (1 October 2025) | “Retroreflective Sheeting: Sign and Delineator Sheeting” — Types IV, VIII, IX, XI. Lists 3M 3930/3931/3932, Avery Dennison T-6500 and T-11500 series, and from ORAFOL: ORALITE 5900 (Type IV), 5930-038 fluorescent orange (Type VIII), 7900 (Type IX) and 9900 (Type XI). Requires participation in the AASHTO 1-Year or 3-Year Retroreflective Sheeting Test Deck |
| Arizona | ADOT Approved Product List, APL-8-2026 (published 3 August 2026) | Section 1007 — “Type 8 / Type 9 / Type 11 Retroreflective Sheeting,” using Arabic rather than Roman numerals |
| Iowa | Standard Specification Section 4186 (revised 21 April 2026) | Binding material spec citing ASTM D4956 “including supplementary requirements,” assigning Types by application |
| New York | NYSDOT Approved List, section 920-1 (Signs) | Approved sign sheeting list |
| Texas | DMS-8300, Sign Face Materials | Departmental material specification |
Both the CTDOT and ADOT lists reissue on rolling dates. Check the current revision rather than these snapshots.
What to do on a specific job
- Find the specifying agency’s spec, not a general rule. State DOT standard specifications and QPL/APL documents are public and usually current.
- Check whether they specify in D4956 numerals or AASHTO M 268 letters. Tennessee-style letter specs need translating.
- Confirm the exact product is on the list, not just the Type. Connecticut lists specific ORAFOL series by name — a Type-equivalent product that is not listed cannot be furnished. Our ORALITE to ASTM crosswalk tells you which grade satisfies which Type.
- Check the test-deck participation requirement. Connecticut requires it explicitly.
- Check BABA separately. Type compliance and domestic-content compliance are independent requirements — see Buy America and BABA for sign sheeting.
If you tell us the agency and the job, we will help you work out which of our ORALITE grades is on that list — and if none is, we will say so rather than sell you something you cannot submit.
Related technical reading
- ASTM D4956 sheeting types explained
- ORALITE to ASTM D4956 Type crosswalk
- MUTCD retroreflectivity requirements for signs
- Buy America and BABA for sign sheeting
Sources: MUTCD 11th Edition (December 2023), Sections 2A.21, 2A.22 and Tables 2A-4, 2A-5. Caltrans Preliminary Investigation PI-0391, “Evaluation of Type XI Retroreflective Sheeting for White Background Signs,” 26 February 2026 — thirteen responding state DOTs. Iowa DOT Standard Specification Section 4186, revised 21 April 2026. AASHTO Product Evaluation and Audit Solutions Information and Operations Guide, 16 August 2024. CTDOT Qualified Product List, 1 October 2025. ADOT Approved Product List APL-8-2026, 3 August 2026. Verify against the current specification before bidding.
