41-6a-605. Minimum speed regulations.
(1) A person 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 reduced speed is necessary for safe operation; upon a grade; or 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) If, based on an engineering and traffic investigation, a highway authority determines that slow speeds on any part of a highway under its jurisdiction consistently impede the normal and reasonable movement of traffic, the highway authority may post a minimum speed limit. If a minimum speed limit is posted under this Subsection, a person may not operate a vehicle at a speed below the posted minimum speed limit except: (3) when necessary for safe operation; or in accordance with Section. 41-6a-205 The minimum speed limit is effective when appropriate signs giving notice are erected along the highway or section of the highway.
(4) A violation of this section is an infraction.