{"abstract":"This document revises selected Federal Motor Vehicle Safety Standards (FMVSS) by converting English measurements specified in those standards to metric measurements. This is one of several rulemaking actions that NHTSA is undertaking to implement the Federal policy that the metric system of measurement is the preferred system of weights and measures for United States trade and commerce. The conversions are not intended to make any changes in the stringency of the affected FMVSS. A companion final rule published in today's Federal Register converts English measurements in selected safety standards on tires to metric measurements.","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/1998/05/27/98-13431.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"571","title":49}],"citation":"63 FR 28922","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This final rule is effective May 27, 1999. Optional early compliance with the changes made in this final rule is permitted beginning May 27, 1998.","disposition_notes":null,"docket_ids":["Docket No. NHTSA-98-3836"],"dockets":[],"document_number":"98-13431","effective_on":"1999-05-27","end_page":28957,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":null,"html_url":"https://www.federalregister.gov/documents/1998/05/27/98-13431/federal-motor-vehicle-safety-standards-metric-conversion","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/98-13431?publication_date=1998-05-27","mods_url":"https://www.govinfo.gov/metadata/granule/FR-1998-05-27/98-13431/mods.xml","not_received_for_publication":null,"page_length":36,"page_views":{"count":459,"last_updated":"2026-10-23 06:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-1998-05-27/pdf/98-13431.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":null,"publication_date":"1998-05-27","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/1998/05/27/98-13431.txt","regulation_id_number_info":{"2127-AG55":{"issue":"199804","html_url":"https://www.federalregister.gov/regulations/2127-AG55/metric-conversion-phase-ii","title":"Metric Conversion - Phase II","xml_url":"http://www.reginfo.gov/public/do/eAgendaViewRule?pubId=199804&RIN=2127-AG55&operation=OPERATION_EXPORT_XML","priority_category":"Substantive, Nonsignificant"}},"regulation_id_numbers":["2127-AG55"],"regulations_dot_gov_info":{"checked_regulationsdotgov_at":"2011-09-21T05:05:24Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":28922,"subtype":null,"title":"Federal Motor Vehicle Safety Standards; Metric Conversion","toc_doc":null,"toc_subject":null,"topics":[],"type":"Rule","volume":63}