Sec. 547.503.  DISPLAY OF HAZARD LAMPS.  (a)  The operator of a vehicle that is described by Subsection (b) and that is stopped on a roadway or shoulder shall immediately display vehicular hazard warning lamps that comply with Section 547.331, unless the vehicle:
(1)  is parked lawfully in an urban district;
(2)  is stopped lawfully to receive or discharge a passenger;
(3)  is stopped to avoid conflict with other traffic;
(4)  is stopped to comply with a direction of a police officer or an official traffic-control device;  or
(5)  displays other warning devices as required by Sections 547.504-547.507.
(b)  This section applies to a truck, bus, truck-tractor, trailer, semitrailer, or pole trailer at least 80 inches wide or at least 30 feet long.
Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.