Colorado Motorcycle Lane Filtering Law

Yes, limited motorcycle lane filtering became legal in Colorado under SB24-079. Since August 7, 2024, Colorado law (C.R.S. 42-4-1503(3)(b)) allows the driver of a two-wheeled motorcycle to pass another vehicle in the same lane only when strict conditions are met: the vehicle being passed is stopped, vehicles in adjacent same-direction lanes are also stopped, the lanes are wide enough to pass safely, the motorcycle travels at 15 miles per hour or less, and conditions allow prudent operation.

That does not mean every pass between vehicles is legal. It does not mean riders can weave through moving traffic. It does not mean an insurer must accept a rider's version of a crash. It also does not mean a driver is always at fault because a motorcycle was filtering nearby.

The law took effect August 7, 2024. Unless the legislature extends it, the authorization is scheduled to repeal on September 1, 2027, and the Colorado Department of Transportation must report safety data to the legislature by January 1, 2027. Because the authorization is time-limited, riders should confirm the current rule with a lawyer before relying on it for a live claim.

If you were hurt in a motorcycle crash, CGH Injury Lawyers can review the facts through its motorcycle accident practice and Denver motorcycle accident resources.

C.R.S. 42-4-1503(3)(b), as amended by SB24-079, sets several conditions for legal filtering:

• Traffic in the rider's lane and adjacent same-direction lanes must be stopped.
• The lane must be wide enough for the vehicle and motorcycle while the rider passes.
• The motorcycle must travel at 15 mph or less.
• Conditions must permit prudent operation, and the rider must stop filtering once traffic begins moving.
• The rider must not pass on the right shoulder, must not pass to the right of a vehicle in the farthest right-hand lane on a highway that is not limited access, and must not enter a lane for traffic moving in the opposite direction.

Those prohibitions come from the statute itself, which functionally pushes passing to the left in most situations. Exact wording matters in a crash claim, which is why the crash facts should be compared against the statutory conditions, not a slogan.

For a claim, each condition becomes a fact question. Was traffic fully stopped? What was the rider's speed? Was the lane wide enough? Did the rider stay off the right shoulder and out of oncoming lanes? Did a driver change position, open a door, turn, or move suddenly? Did the rider keep control? Did either person have a chance to avoid the crash?

Lane filtering can affect crash fault, but it does not automatically decide it. Colorado follows a modified comparative negligence rule under C.R.S. 13-21-111: compensation is reduced in proportion to the injured person's percentage of fault, and recovery is barred entirely if that share of fault is equal to or greater than that of the party or parties recovery is sought from. In practical terms, the injured person can recover only if they are less than 50 percent at fault. That means the evidence may be used to allocate fault between parties when more than one person's conduct contributed to the crash.

In a lane-filtering crash, the evidence may include:

• Whether traffic was fully stopped.
• Whether the motorcycle was traveling at 15 mph or less.
• Whether the lane was wide enough.
• Whether the rider stayed off the right shoulder and out of oncoming lanes.
• Whether a vehicle moved, turned, opened a door, or changed position.
• Whether a driver had mirrors, signals, or visibility issues.
• Whether road design, lighting, weather, or traffic controls mattered.
• Whether either side gave a recorded statement that conflicts with the physical evidence.

The insurer may try to frame the case around one fact. A rider may be blamed because the driver did not understand filtering. A driver may be blamed because the rider was lawfully filtering. Both shortcuts can be wrong. Fault needs a full record.

CGH's page on Colorado comparative negligence for motorcycle accidents explains how shared fault can affect motorcycle claims.

Contact CGH if you were hurt in a lane-filtering crash, the insurer is blaming you, a driver says filtering was illegal, the police report is incomplete, or you are unsure whether your own statement could hurt the claim.

The review should focus on the actual crash facts: traffic movement, speed, lane width, vehicle positions, video, witnesses, injuries, medical care, insurance coverage, and any statements already given. If the case involves a low first offer, CGH's motorcycle settlement offer resource may also be useful background.

Call (303) 209-9395 or use the contact form to ask CGH Injury Lawyers to review a Colorado motorcycle crash. Ask CGH for current consultation, fee, cost, and language-access terms before relying on any public summary.