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DOT/NHTSA RIN: 2127-AL58 Publication ID: Fall 2021 
Title: Upgrade of Rear Impact Guard Requirements for Trailers and Semitrailers 
Abstract: If finalized, this rulemaking would upgrade FMVSS No. 223, Rear impact guards, and FMVSS No. 224, Rear impact protection, for improving rear underride crash protection on trailers and semitrailers. 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 USC 30111    49 USC 30115    49 USC 30117    49 USC 30166    49 USC 322    delegation of authority at 49 CFR 1.95   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  12/16/2015  80 FR 78417   
NPRM Comment Period End  02/16/2016 
Final Action  01/00/2022 
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: Businesses  Federalism: No 
Included in the Regulatory Plan: No 
RIN Information URL: www.regulations.gov   Public Comment URL: www.regulations.gov  
RIN Data Printed in the FR: No 
Agency Contact:
Jim Myers
Chief, Special Vehicles and Systems Division
Department of Transportation
National Highway Traffic Safety Administration
1200 New Jersey Avenue, SE,
Washington, DC 20590
Phone:202 493-0031
Email: james.myers@dot.gov