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DOT/NHTSA RIN: 2127-AL58 Publication ID: Spring 2022 
Title: Upgrade of Rear Impact Guard Requirements for Trailers and Semitrailers 

This rulemaking would upgrade FMVSS No. 223, Rear impact guards, and FMVSS No. 224, Rear impact protection, to improve rear underride crash protection on trailers and semitrailers pursuant to section 23011 of the Bipartisan Infrastructure Bill. This rulemaking responds to a petition for rulemaking from the Insurance Institute for Highway Safety that requested a number of modifications to FMVSS Nos. 223 and 224 to improve rear underride protection for trailers and semitrailers. It also responds, in part, to a petition for rulemaking from Mrs. Karth and the Truck Safety Coalition requesting improving rear impact guards on trailers and semitrailers as outlined in the July 10, 2014, grant of the petition.

Agency: Department of Transportation(DOT)  Priority: Substantive, Nonsignificant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 49 CFR 571.223    49 CFR 571.224   
Legal Authority: 49 U.S.C. 30111    49 U.S.C. 30115    49 U.S.C. 30117    49 U.S.C. 30166    49 U.S.C. 322    delegation of authority at 49 CFR 1.95   
Legal Deadline:
Action Source Description Date
Final  Statutory  Complete rulemaking  11/15/2022 
Action Date FR Cite
NPRM  12/16/2015  80 FR 78417   
NPRM Comment Period End  02/16/2016 
Final Action  06/00/2022 
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: Businesses  Federalism: No 
Included in the Regulatory Plan: No 
RIN Information URL:   Public Comment URL:  
RIN Data Printed in the FR: No 
Agency Contact:
Lina Valivullah
General Engineer
Department of Transportation
National Highway Traffic Safety Administration
1200 New Jersey Avenue SE,
Washington, DC 20590