Utah Code Ann. § 41-6a-1609
(1) An animal-drawn vehicle, a vehicle under Section 41-6a-1604, and a vehicle not specifically required by the provisions of other sections in this chapter to be equipped with lamps or other lighting devices, shall be equipped with lamps or other lighting devices if operated on a highway under the conditions specified under Subsection 41-6a-1603(1)(a) as follows:
(b)