Utah Code Ann. § 41-6a-704
(1)
(a) On any highway:
(i) the operator of a vehicle overtaking another vehicle proceeding in the same direction shall:
(ii) the operator of an overtaken vehicle:
(2) On a highway having more than one lane in the same direction, the operator of a vehicle traveling in the left general purpose lane:
(4) The provisions of Subsection (2) do not apply to an operator of a vehicle traveling in the left general purpose lane when: