49 CFR Parts 171 and 173
[Docket No. PHMSA–2025–0102 (HM–268N)] RIN 2137–AG16
Hazardous Materials: Adoption of Department of Transportation Special Permit 21379
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.
READ MORE: https://www.govinfo.gov/content/pkg/FR-2025-07-01/pdf/2025-12100.pdf