Colorado motorcycle riders can legally filter through stopped traffic, but only under specific conditions.
The state’s lane-filtering law took effect in August 2024 and remains in effect in 2026.Under the current law, a rider on a two-wheeled motorcycle may pass stopped vehicles in the same lane when certain safety requirements are satisfied.
That doesn’t mean motorcycles can weave freely between moving cars. And when a crash happens during lane filtering, whether the rider followed those rules can become an important part of determining fault.
What Is Lane Filtering?
Lane filtering generally occurs when a motorcyclist moves slowly past vehicles that are stopped in traffic.
Colorado’s law allows a rider to overtake or pass another motor vehicle when:
- The vehicle being passed is stopped, and qualifying traffic in adjacent same-direction lanes is also stopped
- The roadway has lanes wide enough to pass safely
- The motorcycle travels at 15 mph or less
- Conditions permit the motorcycle to be operated prudently
Once the surrounding vehicles begin moving, the motorcyclist must stop filtering.
The law also prohibits filtering on the right shoulder, into an opposing lane, and to the right of a vehicle in the farthest right-hand lane.
Lane Filtering Isn’t the Same as Lane Splitting
This distinction matters.
Colorado legalized a limited form of lane filtering, not general lane splitting.
A motorcyclist cannot simply ride between vehicles moving at highway speeds. The statutory exception applies when the vehicles being overtaken are stopped and the motorcycle is traveling no faster than 15 mph.
A rider who continues passing after traffic starts moving may therefore be operating outside the protection of the lane-filtering law.
Is Lane Filtering Still Legal in 2026?
Yes.
Colorado Senate Bill 24-079 took effect on August 7, 2024. The lane-filtering authorization is currently scheduled to repeal on September 1, 2027.
The law also requires the Colorado Department of Transportation to analyze safety data, including motorcycle rear-end and sideswipe collisions, and report to the General Assembly before the scheduled repeal.
Unless the legislature changes the law, riders should therefore be aware that the current authorization is temporary.
Who Is at Fault If a Car Hits a Filtering Motorcycle?
Legal lane filtering does not automatically make a motorcyclist responsible for a collision.
Suppose traffic is stopped and a rider is filtering legally at 10 mph. A driver suddenly changes position or opens a door into the motorcycle’s path. The fact that the rider was filtering does not, by itself, establish that the rider caused the accident.
Instead, fault depends on the conduct of everyone involved.
Evidence may show that a driver failed to look for surrounding traffic or made an unsafe maneuver. Alternatively, evidence might show that the motorcycle was traveling too quickly or filtering when traffic was already moving.
How Do You Prove What Happened?
Lane-filtering crashes can happen quickly, and the parties may give very different accounts afterward.
Useful evidence can include dash-camera or helmet-camera footage, nearby surveillance video, witness statements, vehicle damage, photographs of the roadway, and electronic or accident-reconstruction evidence.
The speed of the motorcycle and whether surrounding traffic was stopped can be especially important because both facts directly affect whether the filtering maneuver complied with Colorado law.
What Damages May Be Available?
When another party causes a motorcycle crash, an injured rider may potentially seek compensation for medical expenses, lost income and earning capacity, pain and suffering, and other legally recoverable damages.
Colorado’s comparative-negligence rules may affect the ultimate recovery when both the rider and another driver contributed to the crash.
Serious motorcycle injuries can also raise questions about permanent impairment, disfigurement, future medical care, and long-term earning losses.
Why Legal Guidance Matters
Colorado’s lane-filtering law changes an assumption that drivers, insurers, and even some riders may still make: a motorcycle is not automatically breaking the law simply because it passes stopped traffic within the same lane.
Arckey & Steele can help injured Colorado motorcyclists investigate how a crash occurred, determine whether the filtering maneuver complied with state law, preserve evidence, and respond when an insurer attempts to place responsibility on the rider.
