Utah Code § 41-6a-705: Passing on right -- When permissible.

(1) Subject to Section 41-6a-718, the operator of a vehicle may overtake and pass on the right of another vehicle only:

(a) when the vehicle overtaken is making or preparing to make a left turn; or

(b) on a roadway with unobstructed pavement of sufficient width for two or more lines of vehicles moving lawfully in the direction being traveled by the overtaking vehicle.

(2) The operator of a vehicle may overtake and pass another vehicle on the right only under conditions permitting the movement with safety.

(3) Except for a person operating a bicycle, the operator of a vehicle may not overtake and pass another vehicle if the movement is made by driving off the roadway.

(4) A violation of this section is an infraction.