Hazardous Materials: Adoption of Department of Transportation Special Permit 21379

Document Headings Document headings vary by document type but may contain the following: the agency or agencies that issued and signed a document the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to the agency docket number / agency internal file number the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Department of Transportation Pipeline and Hazardous Materials Safety Administration 49 CFR Parts 171 and 173 [Docket No. PHMSA-2025-0102 (HM-268N)] RIN 2137-AG16 AGENCY: Pipeline and Hazardous Materials Safety Administration (PHMSA), Department of Transportation (DOT). ACTION: Notice of proposed rulemaking (NPRM). SUMMARY: This NPRM proposes to adopt the provisions of DOT special permit (SP) 21379 into the hazardous materials regulations to streamline the transportation of large refrigerating machines filled with flammable gases. DATES: Comments must be received on or before September 2, 2025. ADDRESSES: You may submit comments identified by the Docket Number PHMSA-2025-0102 using any of the following methods: E-Gov Web: https://www.regulations.gov . This site allows the public to enter comments on any Federal Register notice issued by any agency. Follow the online instructions for submitting comments. Mail: Docket Management System: U.S. Department of Transportation, 1200 New Jersey Avenue SE, West Building Ground Floor, Room W12-140, Washington, DC 20590-0001. Hand Delivery: U.S. DOT Docket Management System: West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue SE, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. Fax: 1-202-493-2251. Instructions: Please include the docket number PHMSA-2025-0102 at the beginning of your comments. If you submit your comments by mail, submit two copies. If you wish to receive confirmation that PHMSA recei…