It also exempts auxiliary lanes as well as the HOV lane. It's found under 41-6a-702, effective 5/12/2020

Left lane restrictions — Exceptions — Other lane restrictions — Penalties.
(1) As used in this section and Section 41-6a-704, "general purpose lane" means a highway lane open to vehicular traffic but does not include a designated:
(a) high occupancy vehicle (HOV) lane; or
(b) auxiliary lane that begins as a freeway on-ramp and ends as part of the next freeway off-ramp.


This is important to exempt the HOV lane, because you cannot yield to the right to an overtaking vehicle in a large portion of the HOV lane due to the double white lines - crossing those is a violation. In the general purpose lanes, you can and must yield to the right, as no lines or traffic control devices prevent that in standard conditions of general purpose lanes.

https://le.utah.gov/xcode/Title41/Chapter6a/41-6a-S702.html#:~:text=Left%20lane%20restrictions%20%2D%2D%20Exceptions%20%2D%2D%20Other%20lane%20restrictions%20%2D%2D%20Penalties.,-(1)&text=auxiliary%20lane%20that%20begins%20as,the%20next%20freeway%20off%2Dramp.