{"abstract":"The National Highway Traffic Safety Administration (NHTSA) is finalizing minor technical amendments to the test procedures for heavy- duty engines and vehicles to improve accuracy and reduce testing burden. These amendments affect the certification procedures for fuel efficiency standards and related requirements. These amendments increase compliance flexibility, harmonize with other requirements, add clarity, correct errors, and streamline the regulations. Given the nature of these changes, NHTSA does not expect either significant environmental impacts or significant economic impacts for any sector.","action":"Final rule.","agencies":[{"raw_name":"DEPARTMENT OF TRANSPORTATION","name":"Transportation Department","id":492,"url":"https://www.federalregister.gov/agencies/transportation-department","json_url":"https://www.federalregister.gov/api/v1/agencies/492","parent_id":null,"slug":"transportation-department"},{"raw_name":"National Highway Traffic Safety Administration","name":"National Highway Traffic Safety Administration","id":345,"url":"https://www.federalregister.gov/agencies/national-highway-traffic-safety-administration","json_url":"https://www.federalregister.gov/api/v1/agencies/345","parent_id":492,"slug":"national-highway-traffic-safety-administration"}],"body_html_url":"https://www.federalregister.gov/documents/full_text/html/2024/03/15/2024-05010.html","cfr_references":[{"chapter":null,"citation_url":null,"part":535,"title":49}],"citation":"89 FR 18808","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This final rule is effective on May 14, 2024.","disposition_notes":null,"docket_ids":["NHTSA-2020-0079"],"dockets":[{"supporting_documents":[],"agency_name":"NHTSA","documents":[{"comment_count":0,"comment_start_date":"2024-03-15","updated_at":"2024-09-03T16:47:44.715-04:00","comment_url":"https://www.regulations.gov/commenton/NHTSA-2020-0079-0005","allow_late_comments":false,"id":"NHTSA-2020-0079-0005","comment_end_date":null,"regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":0,"id":"NHTSA-2020-0079","title":"FMVSS 583 - AALA OEM Submissions (MY 2021)"}],"document_number":"2024-05010","effective_on":"2024-05-14","end_page":18831,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2024/03/15/2024-05010.xml","html_url":"https://www.federalregister.gov/documents/2024/03/15/2024-05010/improvements-for-heavy-duty-engine-and-vehicle-fuel-efficiency-test-procedures-and-other-technical","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2024-05010?publication_date=2024-03-15","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2024-03-15/2024-05010/mods.xml","not_received_for_publication":null,"page_length":24,"page_views":{"count":587,"last_updated":"2026-04-04 12:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2024-03-15/pdf/2024-05010.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2024-05010.pdf?1710420316","publication_date":"2024-03-15","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2024/03/15/2024-05010.txt","regulation_id_number_info":{"2127-AM28":{"issue":"202310","html_url":"https://www.federalregister.gov/regulations/2127-AM28/improvements-for-heavy-duty-engine-and-vehicle-test-procedures-and-other-technical-amendments","title":"Improvements for Heavy-Duty Engine and Vehicle Test Procedures, and Other Technical Amendments","xml_url":"http://www.reginfo.gov/public/do/eAgendaViewRule?pubId=202310&RIN=2127-AM28&operation=OPERATION_EXPORT_XML","priority_category":"Substantive, Nonsignificant"}},"regulation_id_numbers":["2127-AM28"],"regulations_dot_gov_info":{"supporting_documents":[],"comments_count":0,"agency_id":"NHTSA","comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=NHTSA-2020-0079","supporting_documents_count":0,"docket_id":"NHTSA-2020-0079","document_id":"NHTSA-2020-0079-0005","regulation_id_number":null,"title":"FMVSS 583 - AALA OEM Submissions (MY 2021)","checked_regulationsdotgov_at":"2024-03-16T15:00:06Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":18808,"subtype":null,"title":"Improvements for Heavy-Duty Engine and Vehicle Fuel Efficiency Test Procedures, and Other Technical Amendments","toc_doc":"Improvements for Heavy-Duty Engine and Vehicle Fuel Efficiency Test Procedures, and other Technical Amendments","toc_subject":null,"topics":["Fuel economy","Reporting and recordkeeping requirements"],"type":"Rule","volume":89}