2127-AM28 202310 The Regulatory Plan and the Unified Agenda of Federal Regulatory and Deregulatory Actions 2127 National Highway Traffic Safety Administration NHTSA 2100 Department of Transportation DOT Improvements for Heavy-Duty Engine and Vehicle Test Procedures, and Other Technical Amendments Substantive, Nonsignificant Previously Published in The Unified Agenda Final Rule Stage No No 49 CFR 523 49 CFR 534 49 CFR 535 delegation of authority at 49 CFR 1.95 No NPRM 09/13/2022 87 FR 56156 NPRM Comment Period End 11/14/2022 Final Rule 11/00/2023 No No None No No www.regulations.gov www.regulations.gov No No Joseph Bayer 2127 National Highway Traffic Safety Administration NHTSA 202 366-9540 joseph.bayer@dot.gov 1200 New Jersey Avenue SE, Washington DC 20590