R920-8-4. Requirements for All Vehicles Engaged in Highway Construction or Maintenance Operations on State Highways

  (1)(a) Except as provided under Subsection (1)(b), beginning July 1, 2015, vehicles engaged in highway construction or maintenance operations on state highways that are not protected by traffic control devices compliant to the current Utah Manual on Uniform Traffic Control Devices, must have a flashing amber lighting system with 360-degree visibility.

  (b) When the flashing amber lighting system does not provide 360-degree visibility, vehicle hazard lights shall be used in addition to the flashing amber lighting system.

  (2) Flashing amber lighting systems may be supplemented with flashing white lights on the front and flashing red lights on the rear that do not alter or modify the original manufacturer's electronically controlled lighting system.