41-6a-605. Minimum speed regulations.
(1) A person may not operate a motor vehicle at a speed so slow as to impede or blockthe 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 limitside by side with and at the same speed as a vehicle operated in the adjacent right lane isevidence of a violation of Subsection (1).
(3) (a) If, based on an engineering and traffic investigation, a highway authoritydetermines that slow speeds on any part of a highway under its jurisdiction consistently impedethe normal and reasonable movement of traffic, the highway authority may post a minimumspeed limit.
(b) If a minimum speed limit is posted under this Subsection (3), a person may notoperate 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 areerected along the highway or section of the highway.

Renumbered and Amended by Chapter 2, 2005 General Session