41-6a-605. Minimum speed regulations.
(1) An individual may not operate a motor vehicle at a speed so slow as to impede or block the normal and reasonable movement of traffic except when:
(a) a reduced speed is necessary for safe operation;
(b) upon a grade; or
(c) in compliance with a traffic-control device.
(2) Operating a motor vehicle on a limited access highway at less than the speed limit side by side with and at the same speed as a vehicle operated in the adjacent right lane is evidence of a violation of Subsection (1).
(3)(a) If, based on an engineering and traffic investigation, a highway authority determines that slow speeds on any part of a highway under the highway authority's jurisdiction consistently impede the normal and reasonable movement of traffic, the highway authority may post a minimum speed limit.
(b) If a minimum speed limit is posted under this Subsection (3), an individual may not operate a vehicle at a speed below the posted minimum speed limit except:
(i) when necessary for safe operation; or
(ii) in accordance with Section 41-6a-205.
(c) The minimum speed limit is effective when appropriate signs giving notice are erected along the highway or section of the highway.
(4) An individual operating a classic vehicle as described in Section 41-28-102 is exempt from the requirements of this section.
(5) A violation of this section is an infraction.