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DOT/PHMSA RIN: 2137-AG16 Publication ID: Spring 2025 
Title: ●Hazardous Materials: Adopt DOT Special Permit 21379 into the HMR 
Abstract:

This rulemaking 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.

 
Agency: Department of Transportation(DOT)  Priority: Substantive, Nonsignificant 
RIN Status: First time published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: No 
EO 14192 Designation: Deregulatory 
CFR Citation: 49 CFR Part 171    49 CFR Part 173     (To search for a specific CFR, visit the Code of Federal Regulations.)
Legal Authority: 49 U.S.C. sec. 5101 et seq.   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  07/01/2025  90 FR 28552   
NPRM Comment Period End  09/02/2025 
Additional Information: Docket No. PHMSA-2025-0102 (HM-268N)
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Information URL: www.regulations.gov   Public Comment URL: www.regulations.gov  
RIN Data Printed in the FR: No 
Agency Contact:
Ryan Larson
Transportation Specialist
Department of Transportation
Pipeline and Hazardous Materials Safety Administration
1200 New Jersey Avenue SE,
Washington, DC 20590
Phone:202 366-8553
Email: ryan.larson@dot.gov