Utah Code Ann. § 41-6a-1637
(1) Except as provided under Subsection (2) and unless the vehicle is carrying the equipment required under this section, a person may not operate a truck, bus or truck-tractor, or a motor vehicle towing a house trailer:
(2)
(a) The vehicle shall carry at least:
(4)
(a) A person may not operate a motor vehicle used for the transportation of explosives or any cargo tank truck used for the transportation of flammable liquids or compressed gases under the conditions specified under Subsections (1)(a) and (b) unless there is carried in the vehicle: