Utah Bans Lane Splitting but Allows Lane Filtering at 15 mph Past Stopped Traffic

Utah defines both manoeuvres so the line between them cannot be argued at the roadside. Utah Code 41-6a-102(39) defines lane filtering as, when operating a motorcycle other than an autocycle, the act of overtaking and passing another vehicle that is stopped in the same direction of travel in the same lane, and expressly says it does not include lane splitting. Subsection (40) defines lane splitting as riding a motorcycle between clearly marked lanes for traffic travelling in the same direction while traffic is in motion, and says it does not include lane filtering. Motion is the hinge: if the traffic beside you is rolling, you are splitting; if it is stopped and you are in its lane, you may be filtering.

The filtering conditions in Section 41-6a-704(6) are cumulative, and four of them are geographic rather than behavioural. The rider must be on a roadway divided into two or more adjacent lanes in the same direction of travel, or on an off-ramp so divided. The roadway must carry a posted speed limit of 45 miles per hour or less, unless the rider is on an off-ramp, where the underlying limit does not disqualify. The rider may not be on an on-ramp at all. Utah defines those ramps separately in Subsection (1): an off-ramp connects a freeway or limited access highway to an intersection, an on-ramp connects an intersection to a freeway or limited access highway, and neither term reaches the connector between two controlled access or limited access highways. So a rider filtering down an I-15 off-ramp queue in Lehi is within the statute, and the same rider filtering up the on-ramp is not.

The behavioural conditions are equally tight. The vehicle being overtaken in the same lane must be stopped, not merely slow. The motorcycle must be travelling at 15 miles per hour or less. And the movement must be capable of being made safely. Fail any one and Subsection (7) makes it an infraction.

The prohibition on splitting was added later and it bites much harder than an infraction usually does. Section 41-6a-704.1 was enacted by Chapter 220 of the 2025 General Session and took effect January 1, 2026. Subsection (2) makes the violation an infraction, but Subsection (3) then requires the Driver License Division to suspend the rider's motorcycle endorsement for 90 days, or, if the rider has no valid endorsement, the driver license itself for 90 days. A second conviction means 180 days under Subsection (4), and a third or subsequent conviction means revocation of the endorsement under Subsection (5). Subsection (6) requires the court to forward the conviction to the Division under Section 53-3-218, and Subsection (7) lets a law enforcement officer impound the vehicle. Utah is unusual in attaching licence consequences to what it still classifies as an infraction.

Two other sections have to be read alongside these. Section 41-6a-1502(1) gives a motorcycle full use of a lane and forbids any other driver from depriving it of that lane, but Subsection (1)(c) withdraws the entitlement from motorcycles operated two abreast in a single lane, and Subsection (4) caps a lane at two abreast. Subsection (2) forbids overtaking and passing in the same lane occupied by the vehicle being overtaken, and Subsection (3)(a) forbids operating a motorcycle between lanes of traffic or adjacent lines or rows of vehicles, with Subsection (3)(b) disapplying that ban to a rider engaged in lane filtering under Section 41-6a-704. Subsection (5) exempts peace officers acting in their official capacities from both bans. Separately, Section 41-6a-710(1)(a) requires every vehicle to stay as nearly as practical entirely within a single lane, and Subsection (1)(c)(i) carves out a motorcyclist engaged in lane filtering, alongside carve-outs for school buses and public transit vehicles that temporarily impede a parking or bike lane.

The expiry date is the part Utah riders most often miss. Utah Code 63I-1-241 is the Legislature's repeal-dates section for Title 41, and Subsections (2), (3) and (4) repeal Subsection 41-6a-102(39), Subsection 41-6a-704(6) and Subsection 41-6a-710(1)(c) on July 1, 2027, each identified as regarding lane filtering. If the Legislature does not act, the definition of lane filtering, the seven-condition permission and the lane-discipline carve-out all fall away on that date, leaving only the general single-lane duty and the express prohibition in Section 41-6a-704.1 standing. Nothing repeals Section 41-6a-704.1 or Section 41-6a-1502(3)(b).

Filtering outside the seven conditions in Section 41-6a-704(6) is an infraction under Subsection (7) of that section, enforced roadside by a peace officer, with no licence consequence attached. Lane splitting is a different matter. 1(1) is an infraction under Subsection (2), and Subsection (3) then requires the Driver License Division to suspend the rider's motorcycle endorsement for 90 days, or the driver license for 90 days if the rider holds no endorsement. A second conviction draws a 180-day endorsement suspension under Subsection (4) and a third or subsequent conviction draws revocation under Subsection (5).

The suspension is mandatory on the Division once the court forwards the conviction under Section 53-3-218, so it is not something the court can waive at sentencing. Subsection (7) additionally permits a law enforcement officer to impound the vehicle of a person who violates the splitting ban. Riding between lanes can also be charged under Section 41-6a-1502(3)(a), which is an infraction under Subsection (7) of that section.