{"data":{"id":"us/49-cfr-564.4","jurisdiction":"us","citation":"49 CFR 564.4","heading":"Definitions.","body":"All terms defined in the Act and the regulations and standards issued under its authority are used as defined therein.","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER V—NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","PART 564—REPLACEABLE LIGHT SOURCE AND SEALED BEAM HEADLAMP INFORMATION"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-49.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:34Z","sha256":"481a54a8c00a1e76fcd6d22be1daef5cc6bdcbb74e5d1d6b6a287884ad6933e1","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-564.3","next":"us/49-cfr-564.5"},"notice":"GroundRules: Original legal text. Not legal advice."}