(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.
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