C.F.R. » Title 49 » 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

49 C.F.R. § 393.19

Hazard warning signals

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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.

[70 FR 48046, Aug. 15, 2005]