[Code of Federal Regulations]
[Title 49, Volume 5]
[Revised as of October 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR393.19]

[Page 396]
 
                        TITLE 49--TRANSPORTATION
 
                      DEPARTMENT OF TRANSPORTATION
 
PART 393_PARTS AND ACCESSORIES NECESSARY FOR SAFE OPERATION--Table of 
Contents
 
       Subpart B_Lamps, Reflective Devices, and Electrical Wiring
 
Sec.  393.19  Hazard warning signals.

    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 Sec.  
393.11 to flash simultaneously.

[70 FR 48046, Aug. 15, 2005]