(A) The commissioner of highways is authorized to determine those portions of any highway where overtaking and passing or driving to the left of the roadway would be especially hazardous and may by appropriate signs or markings on the roadway indicate the beginning and end of these zones, and when the signs or markings are in place and clearly visible to an ordinarily observant person, every driver of a vehicle shall obey the directions thereof, except as provided for in § 71.10(B)(2). (KRS 189.340(6))
(B) Whenever any roadway has been divided into 3 clearly marked lanes for travel the following additional rules shall apply.
(1) A vehicle shall be driven as nearly as may be practical entirely within a single lane and shall not be moved from that lane until the driver has first ascertained that the movement can be made with safety;
(2) A vehicle shall not be driven in the center lane except when overtaking and passing another vehicle where the roadway is clearly visible and the center lane is clear of traffic within a safe distance, or in preparation for a left turn or where a center lane is at the time allocated exclusively to traffic moving in the direction in which the vehicle is proceeding and is signposted to give notice of the allocation;
(3) Official signs may be erected directing slow-moving traffic to use a designated lane or allocating specified lanes to traffic moving in the same direction and operators of vehicles shall obey the directions of these signs. (KRS 189.340(7))
(4) A vehicle shall not be driven in the left lane of any limited access highway of 4 lanes or more with a posted speed limit of at least 65 miles per hour except in overtaking a slower vehicle yielding to traffic coming onto such a highway or when traffic conditions exist which would prohibit safe use of the right or center lanes. (KRS 189.340(8)) Penalty, see § 70.99 (A)