{"data":{"id":"us/49-cfr-393.19","jurisdiction":"us","citation":"49 CFR 393.19","heading":"Hazard warning signals.","body":"The hazard warning signal operating unit on each commercial motor vehicle shall operate independently of the ignition or equivalent switch, and when activated, cause all turn signals required by § 393.11 to flash simultaneously.","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER III—FEDERAL MOTOR CARRIER SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER B—FEDERAL MOTOR CARRIER SAFETY REGULATIONS","PART 393—PARTS AND ACCESSORIES NECESSARY FOR SAFE OPERATION","Subpart B—Lamps, Reflective Devices, and Electrical Wiring"],"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":"b7e13ceda0809b6a8a1824622ba43dc06b4e943a45d10ba5baa7cf7908a89933","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-393.17","next":"us/49-cfr-393.20"},"notice":"GroundRules: Original legal text. Not legal advice."}