Utah Code Ann. § 41-6a-1509
(1)
(b) Unless a street or highway is designated as open for street-legal ATV use by the controlling highway authority in accordance with Section 41-22-10.5, a person may not operate a street-legal ATV on a street or highway in accordance with Subsection (1)(a) if the highway is under the jurisdiction of:
(2) A street-legal ATV shall comply with the same requirements as:
(a) a motorcycle for:
(b) a motor vehicle for:
(3) A street-legal ATV shall be equipped with:
(o) tires that:
(4)
(a) Subject to the requirement in Subsection (4)(b), an operator of a street-legal all-terrain vehicle, when operating a street-legal all-terrain vehicle on a highway in accordance with this section, may not exceed the lesser of:
(b) An operator of a street-legal all-terrain vehicle, when operating a street-legal all-terrain vehicle on a highway with a posted speed limit higher than 45 miles per hour, shall:
(5)