Kentucky Has No Lane Splitting Statute, So Lane Discipline Rules Decide

Start with what is not in the code. KRS 189.285 is headed regulations for operating and riding on motorcycles, and its five operative subsections cover a valid motorcycle operator's license, an approved eye-protective device worn at all times the vehicle is in motion, a rear-view mirror required by KRS 189.130, a permanently attached seat and footrest for the operator and any passenger, protective headgear for riders under twenty-one, for instruction permit holders and for anyone licensed less than one year, and a bar on carrying passengers on an instruction permit. It contains no sentence about where in a lane a motorcycle rides, no grant of the full use of a lane, and no prohibition on passing between lines of traffic. Kentucky also has no counterpart to the express authorizations some states enacted, and no counterpart to the express prohibitions others wrote.

The only place in KRS Chapter 189 that speaks about riding side by side is KRS 189.340(2)(c), and it is about bicycles and electric low-speed scooters, not motorcycles: it allows two of them abreast on a single highway lane, and only where they do not impede the normal and reasonable movement of traffic. That the General Assembly wrote a two-abreast rule for bicycles in 2019 and 2024 amendments while never writing one for motorcycles is the strongest textual signal available that Kentucky did not intend to create a lane-sharing right for riders.

So the operative law is the general passing code. KRS 189.340(1) says the driver of a vehicle overtaking other vehicles proceeding in the same direction shall pass to the left of them and shall not again drive to the right until reasonably clear of those vehicles. A rider who moves up the painted line between two occupied lanes is not passing to the left of the overtaken vehicles in the sense that sentence describes, because the maneuver never puts the motorcycle clear of them in an adjacent lane. KRS 189.340(3) then limits passing on the right to two cases only: when the vehicle overtaken is making or about to make a left turn, or upon a roadway with unobstructed pavement of sufficient width for two or more lines of vehicles moving lawfully in the direction of travel. KRS 189.340(4) adds that passing on the right may be done only under conditions permitting the passing in safety, and never by driving off the roadway unless the vehicle being passed is at a complete stop.

The explicit lane-keeping duty is narrower than most drivers assume, and the boundary matters. KRS 189.340(7) opens with the words whenever any roadway has been divided into three or more clearly marked lanes for travel in one direction, and only then does paragraph (a) require a person to drive a vehicle as nearly as may be practical entirely within a single lane and to stay in it until the driver ascertains that the movement can be made with safety. On a Kentucky road with two lanes in each direction, that specific single-lane command does not apply by its own terms. Enforcement there falls back on KRS 189.340(1) and (3), on KRS 189.300(1), which requires the operator of any vehicle on a highway to travel upon the right side of the highway whenever possible, and on KRS 189.290(1), which requires every operator to drive in a careful manner with regard for the safety and convenience of pedestrians and other vehicles on the highway.

Two further pieces of the same section shape what a rider may legally do in traffic. KRS 189.340(8) prohibits driving in the leftmost lane of a limited access highway of four or more lanes posted at 65 mph or more, except to overtake a slower vehicle, to yield to entering traffic, or where traffic or road conditions prevent safe use of the right or centre lanes, so a rider cannot sit in the fast lane on a Kentucky interstate. KRS 189.340(9)(a) forbids following another vehicle more closely than is reasonable and prudent given speed, traffic and highway conditions, which is the provision most often paired with a filtering allegation when a rider closes on stopped traffic.

The practical upshot for a Kentucky rider is different from the one in a state with an express ban. There is no offence named lane splitting to be charged with and no statutory definition to argue about. Instead the officer picks from the passing and lane provisions above, and on a two-lane-each-way road the state has to show a genuine failure to keep right, an unlawful pass on the right, or careless driving, rather than pointing at a single-lane rule that does not apply below three lanes.

Every provision that reaches lane splitting in Kentucky sits in the same penalty band. KRS 189.990(1)(a) fines a violation of KRS 189.300 to 189.360, which takes in the whole of the passing and lane section KRS 189.340 as well as the keep-right rule KRS 189.300, at not less than twenty dollars and not more than one hundred dollars for each offence. The same paragraph prices a violation of KRS 189.285, the motorcycle operating section, and of KRS 189.290(1) or (2), the careful-driving duty, in the identical twenty to one hundred dollar range. There is no enhanced penalty and no separate offence for riding between lanes, because no section names the maneuver.

The exposure rises where the riding is aggressive rather than merely out of lane. KRS 189.290(4) prohibits operating any vehicle in a reckless or negligent manner so as to endanger persons or property in or near a highway, and KRS 189.290(5) provides that, in addition to any other penalty, an operator who violates that subsection is subject to revocation of his or her operator's license under KRS 186.560. Where a violation of KRS 189.290(4) causes physical injury, KRS 189.990(32) sets a fixed five hundred dollar fine. Enforcement is entirely roadside, by the Kentucky State Police, sheriffs and city police, and a fine imposed under the chapter may be prepayable under KRS 189.999 depending on the offence charged.