(b) When an authorized municipal, public utility or highway construction or maintenance vehicle is stopped or is moving at less than twenty (20) miles per hour on or within three (3) feet of a roadway and is making use of any visual signals provided for in W.S. 31-5-928(d), (f)(ii) or 31-5-930, the driver of every other vehicle, as soon as it is safe:
(i) When driving on an interstate highway or other highway with two (2) or more lanes traveling in the same direction of the municipal, public utility or highway construction or maintenance vehicle, shall merge into the lane farthest from the vehicle or at least one (1) lane of traffic apart from the vehicle except when otherwise directed by a police officer;
(ii) When driving on a two (2) lane road with a posted speed limit of forty-five (45) miles per hour or greater, shall slow to a speed that is twenty (20) miles per hour less than the posted speed limit, except when otherwise directed by a police officer.