Lane Filtering in Utah: What Riders and Drivers Need to Know

Short answer: Lane splitting, riding between lanes of moving traffic, is illegal in Utah. Lane filtering is legal: a motorcyclist may ride between lanes to pass vehicles that are stopped, but only at 15 mph or less, on a road with a speed limit of 45 mph or less (or an off-ramp) and two or more lanes going the same direction.

The two terms sound alike and get used interchangeably, which is how riders end up with tickets and how drivers end up surprised by a motorcycle beside them at a red light. The law treats them very differently.

Filtering and Splitting Are Not the Same Thing

Utah defines both terms (Utah Code 41-6a-102). Lane filtering is overtaking and passing another vehicle that is stopped, in the same direction of travel, in the same lane. Lane splitting is riding between clearly marked lanes of traffic going the same direction while traffic is in motion. Each definition expressly excludes the other.

Outside of filtering, riding a motorcycle between lanes of traffic or between adjacent rows of vehicles is prohibited (Utah Code 41-6a-1502(3)).

Every Condition Has to Be Met

A rider may filter only when all of the following are true (Utah Code 41-6a-704(6)):

1. The rider is on a motorcycle.
2. The roadway, or an off-ramp, is divided into two or more adjacent lanes going the same direction.
3. The speed limit is 45 mph or less, or the rider is on an off-ramp.
4. The rider is not on an on-ramp.
5. The vehicle being passed is stopped.
6. The motorcycle is going 15 mph or less.
7. The movement can be made safely.

Miss any one of them and the move is an infraction (Utah Code 41-6a-704(7)). The usual picture of legal filtering is a line of cars stopped at a city intersection. The usual picture of illegal splitting is a motorcycle weaving through slow freeway traffic.

The Rule Has an Expiration Date

The lane filtering provisions are scheduled for repeal on July 1, 2027, under Utah’s legislative sunset review (Utah Code 63I-1-241). Unless the Legislature extends them, filtering will again fall under the general ban on riding between lanes. If you ride, check the law again before that date.

What It Means for Drivers

A motorcycle is entitled to the full use of a lane, and no driver may operate a vehicle in a way that deprives a motorcycle of it (Utah Code 41-6a-1502(1)). Drivers must also stay as nearly as practical within a single lane and may not leave it until they have reasonably determined the move can be made safely (Utah Code 41-6a-710).

In practice, the collisions happen in two ways: a driver opens a door or drifts toward the lane line while traffic is stopped, or a driver changes lanes the moment traffic starts moving without checking a mirror. When a rider was filtering within every condition of the statute, those facts point to the driver.

How Fault Gets Decided

Expect the insurer to argue about the conditions: that traffic was still rolling, that the rider was over 15 mph, that the road’s limit was above 45. Utah compares fault, and an injured rider recovers only if the other side’s combined fault is greater than their own (Utah Code 78B-5-818). That is why speed, the signal phase and the posted limit need to be documented early: video from nearby businesses, the crash report and witness names.

One argument insurers cannot make: not wearing a helmet “does not constitute contributory or comparative negligence” and may not be introduced as evidence in any civil case on negligence, injuries or mitigation of damages (Utah Code 41-6a-1505(6)). Riders should also know that Utah motorcycle policies are not required to carry PIP, which changes who pays the first medical bills. We cover that in motorcycle accident claims in Utah.

After a Crash While Filtering

Get medical care first, and call 911 so an officer writes a report and records the speed limit and lane setup. Photograph where the vehicles and the motorcycle came to rest, the traffic signal, and the lanes. Ask nearby businesses whether their cameras caught the intersection, since many systems record over themselves within days. Write down what traffic was doing, stopped or moving, before your memory of it blurs. Those facts decide whether filtering was legal.

Talk to a Utah Motorcycle Accident Attorney

If you were hit while filtering, or a driver claims you were splitting lanes, the details decide the case. Our Salt Lake City motorcycle accident attorneys represent riders across Utah.

Hurt in Utah? Contact West Injury Law for a free case review. No attorney fees unless we win. Hablamos Español.