Notice2025-22192
National Hazardous Materials Route Registry
Primary source
Metadata and text below are from the Federal Register, a public-domain U.S. government work. Always verify the official published version before relying on it for any legal matter.
Published
December 8, 2025
Effective
December 8, 2025
Issuing agencies
Transportation DepartmentFederal Motor Carrier Safety Administration
Abstract
This notice provides revisions to the National Hazardous Materials Route Registry (NHMRR) reported to FMCSA from April 1, 2024, through March 31, 2025. The NHMRR is a listing, as reported by State and Tribal governments, of all designated and restricted roads and preferred highway routes for transportation of highway route-controlled quantities of Class 7 radioactive materials (HRCQ/RAM) and non- radioactive hazardous materials (NRHM).
Full Text
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<title>Federal Register, Volume 90 Issue 233 (Monday, December 8, 2025)</title>
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[Federal Register Volume 90, Number 233 (Monday, December 8, 2025)]
[Notices]
[Pages 56830-56832]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2025-22192]
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DEPARTMENT OF TRANSPORTATION
Federal Motor Carrier Safety Administration
National Hazardous Materials Route Registry
AGENCY: Federal Motor Carrier Safety Administration (FMCSA), Department
of Transportation (DOT).
ACTION: Notice; revisions to the listing of designated and restricted
routes for hazardous materials.
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SUMMARY: This notice provides revisions to the National Hazardous
Materials Route Registry (NHMRR) reported to FMCSA from April 1, 2024,
through March 31, 2025. The NHMRR is a listing, as reported by State
and Tribal governments, of all designated and restricted roads and
preferred highway routes for transportation of highway route-controlled
quantities of Class 7 radioactive materials (HRCQ/RAM) and non-
radioactive hazardous materials (NRHM).
DATES: Effective date: December 8, 2025.
FOR FURTHER INFORMATION CONTACT: Ms. Melissa Williams, Hazardous
Materials Division, Office of Enforcement and Compliance, FMCSA, 1200
New Jersey Ave. SE, Washington, DC 20590, (202) 366-4163,
<a href="/cdn-cgi/l/email-protection#18757d74716b6b79366f7174747179756b587c776c367f776e"><span class="__cf_email__" data-cfemail="adc0c8c1c4dedecc83dac4c1c1c4ccc0deedc9c2d983cac2db">[email protected]</span></a>. Office hours are from 9 a.m. to 5 p.m., ET,
Monday through Friday, except for Federal holidays.
Legal Basis and Background
Paragraphs (a)(2) and (b) of section 5112 of title 49 United States
Code (U.S.C.) permit States and Tribal governments to designate and
limit highway routes over which hazardous materials (HM) may be
transported, provided the State or Tribal government complies with
standards prescribed by the Secretary of Transportation (the Secretary)
and meets publication requirements in section 5112(c). To establish
standards under paragraph (b), the Secretary must consult with the
States, and, under section 5112(c), coordinate with the States to
``update and publish periodically'' a list of currently effective HM
highway routing designations and restrictions. The requirements that
State and Tribal governments must follow to establish, maintain, or
enforce routing designations for the transport of placardable
quantities of NRHM are set forth in 49 CFR part 397, subpart C. Subpart
D of part 397 sets out the requirements for designating preferred
routes for HRCQ/RAM shipments as an alternative, or in addition, to
Interstate System highways. For HRCQ/RAM shipments, Sec. 397.101
defines a preferred route as an interstate highway for which no
alternative route is designated by the State; a route specifically
designated by the State; or both (see Sec. 397.65 for the definitions
of NRHM and routing designations).
Under a delegation from the Secretary,\1\ FMCSA has authority to
implement 49 U.S.C. 5112.
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\1\ 49 CFR 1.87(d)(2).
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Currently, Sec. 397.73 establishes public information and
reporting requirements for NRHM. States or Tribal governments are
required to furnish information regarding any new or changed routes to
FMCSA within 60 days after establishment. Under Sec. 397.103, a state
routing designation for HRCQ/RAM routes (preferred routes) as an
alternative, or in addition, to an Interstate System highway, is
effective when the authorized routing agency provides FMCSA with
written notification, FMCSA acknowledges receipt in writing, and the
route is published in FMCSA's NHMRR. The Office of Management and
Budget has approved these collections of information under control
number 2126-0014, Transportation of Hazardous Materials, Highway
Routing.
In this notice, FMCSA is merely performing the ministerial function
of updating and publishing the NHMRR
[[Page 56831]]
based on input from its State and Tribal partners under 49 U.S.C.
5112(c)(1). Accordingly, this notice serves only to provide the most
recent revisions to the NHMRR; it does not establish any new public
information and reporting requirements.
Updates to the NHMRR
FMCSA published the full NHMRR in a Federal Register notice on
April 29, 2015 (80 FR 23859). Since publication of the 2015 notice,
FMCSA has published seven updates to the NHMRR in Federal Register
notices on August 8, 2016 (81 FR 52518), August 9, 2018 (83 FR 39500),
September 24, 2019 (84 FR 50098), June 3, 2020 (84 FR 34284), June 17,
2021 (86 FR 32306), May 11, 2022 (87 FR 28859), and July 16, 2024 (89
FR 57987).
This notice provides revisions to the NHMRR, reported to FMCSA from
April 1, 2024, through March 31, 2025. The revisions to the NHMRR
listings in this notice supersede and replace corresponding NHMRR
listings published in the April 29, 2015, notice and corresponding
revisions to the NHMRR listings published in the August 8, 2016, August
9, 2018, September 24, 2019, June 3, 2020, June 17, 2021, May 11, 2022,
and July 16, 2024, notices. Continue to refer to the April 29, 2015,
notice for additional background on the NHMRR and the August 8, 2016,
notice for the procedures for State and Tribal government routing
agencies to update their Route Registry listings and contact
information.
The full current NHMRR for each State is posted on FMCSA's website
at: <a href="https://www.fmcsa.dot.gov/regulations/hazardous-materials/national-hazardous-materials-route-registry">https://www.fmcsa.dot.gov/regulations/hazardous-materials/national-hazardous-materials-route-registry</a>.
Revisions to the NHMRR in This Notice
In accordance with the requirements of Sec. Sec. 397.73 and
397.103, the NHMRR is revised as follows:
Table 2--District of Columbia--Designated NRHM Routes
A new Route Order Designator ``C'' added and assigned a ``0''
restriction.
Table 3--Michigan--Restricted NRHM Routes
Route Order Designator ``A'' was updated and now classes 1, 6.2,
and 7 are restricted on the Ambassador Bridge.
Table 4--California--Designated HRCQ RAM Routes
Route Order Designator ``O'' was added and assigned a ``P''
designation.
Route Order Designator ``P'' was added and assigned a ``P''
designation.
Route Order Key
Each listing in the NHMRR includes codes to identify each route
designation and each route restriction reported by the State.
Designation codes identify the routes along which a driver may or must
transport specified HM. Among the designation codes is one for
preferred routes, which apply to the transportation of HRCQ/RAM.
Restriction codes identify the routes along which a driver may not
transport specified HM shipments. Table 1 presents information on each
restriction and designation code. Tables 2, 3 and 4 presents
information on the revisions to the route registry.
Table 1--Restriction/Designation Key
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Restrictions Designations
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0--ALL Hazardous Materials A--ALL NRHM Hazardous Materials
1--Class 1--Explosives B--Class 1--Explosives
2--Class 2--Gas I--Poisonous Inhalation Hazard
(PIH)
3--Class 3--Flammable P--*Preferred Route* Class 7--
Radioactive
4--Class 4--Flammable Solid/
Combustible
5--Class 5--Organic
6--Class 6--Poison
7--Class 7--Radioactive
8--Class 8--Corrosives
9--Class 9--Dangerous (Other)
i--Poisonous Inhalation Hazard
(PIH)
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Revisions to the National Hazardous Materials Route Registry (March 31,
2023)
Table 2--District of Columbia--Designated NRHM Routes
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FMCSA
Designation date Route order Route description City County Designation (A, B, I, P) comment
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4/2/2024............... C................ Add I-295 Oxon Run SE.................... DC.................... A
Creek to I-695.
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Table 3--Michigan--Restricted NRHM routes
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FMCSA
Designation date Route order Route description City County Restriction (0-9 and i) comment
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8/29/2024.............. D................ Ambassador Bridge Detroit............... Wayne................. 1, 6.2, 7
from [Detroit]
Porter St. to Canada
[Windsor].
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[[Page 56832]]
Table 4--California--HRCQ RAM Routes
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FMCSA
Designation date Route order Route description City County Designation (A, B, I, P) comment
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03/20/24............... O................ State Route 58 from Barstow............... Kern.................. P
Interstate Highway
15 to State Route
223.
03/20/24............... P................ State Route 223 from Bakersfield........... Kern.................. P
State Route 58 to
Interstate Highway 5.
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End of Revisions to the National Hazardous Materials Route
Registry.
Derek Barrs,
Administrator.
[FR Doc. 2025-22192 Filed 12-5-25; 8:45 am]
BILLING CODE 4910-EX-P
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</html>Indexed from Federal Register on December 8, 2025.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.