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DOT/NHTSA RIN: 2127-AM28 Publication ID: Fall 2021 
Title: Improvements for Heavy-Duty Engine and Vehicle Test Procedures, and Other Technical Amendments 
Abstract: This rulemaking would propose changes to NHTSA regulatory text to align with EPA's test procedures used for heavy-duty engines and vehicles to demonstrate compliance with fuel consumption and emission standards. The rulemaking would also propose other amendments that would add compliance flexibility, harmonize with other requirements, add clarity, correct various errors, and streamline the regulations. 
Agency: Department of Transportation(DOT)  Priority: Substantive, Nonsignificant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 49 CFR 523    49 CFR 534    49 CFR 535   
Legal Authority: delegation of authority at 49 CFR 1.95   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  11/00/2021 
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:
Gregory Powell
Program Analyst
Department of Transportation
National Highway Traffic Safety Administration
1200 New Jersey Avenue, SE,
Washington, DC 20590
Phone:202 366-5206
Email: gregory.powell@dot.gov