Utah Administrative Code
Topic - Transportation
Title R920 - Operations, Traffic and Safety
Rule R920-8 - Flashing Light Usage on Highway Construction or Maintenance Vehicles
Section R920-8-9 - Exceptions

(1) When multiple vehicles are engaged in highway construction and maintenance operations, and are concentrated within a small area in a work zone, it is acceptable for those vehicles within the perimeter of vehicles to reduce the intensity or turn off the flashing amber lighting systems or supplemental flashing lighting systems to minimize the distractions to motorists and other workers in the work zone.

(2) A delivery vehicle is not required to have a flashing amber lighting system but must use vehicle hazard lights when entering or exiting a work zone.