Last Updated: April 2, 2026

**Lane splitting (riding between lanes) is illegal in Illinois and creates liability for the motorcycle rider.** However, other drivers must still avoid hitting motorcyclists splitting lanes. Comparative negligence applies if both the rider and driver contributed to the accident.

Lane Splitting and Motorcycle Accidents in Illinois: What the Law Says

Lane splitting — riding a motorcycle between lanes of slow-moving or stopped traffic — is a common practice in states like California where it is explicitly legal. Illinois is not one of those states. Under current Illinois law, lane splitting is not authorized, and a rider who splits lanes and is involved in a collision faces a more complicated injury claim. That does not mean the claim is impossible, but it does mean the legal analysis requires care.

Illinois Law on Lane Splitting

The Illinois Vehicle Code does not explicitly address lane splitting by name, but the general traffic provisions effectively prohibit it. Section 625 ILCS 5/11-703 governs driving within lanes and requires vehicles, including motorcycles, to be driven entirely within a single lane and to not move from that lane until the driver has determined the movement can be made safely. Riding between lanes violates this provision.

Illinois also has no lane-filtering law, which some states have adopted to allow motorcycles to move between stopped vehicles at intersections or in heavy traffic. As of 2026, Illinois remains among the majority of states that have not legalized any form of lane splitting or filtering. Riders who split lanes in Illinois do so in violation of traffic law. Our Peoria motorcycle accident lawyers understand how this violation affects — but does not necessarily destroy — an injury claim.

Comparative Fault When Lane Splitting

Illinois follows a modified comparative negligence system under 735 ILCS 5/2-1116. This means a motorcyclist who was lane splitting at the time of a crash can still recover damages if their fault was less than 50 percent. The critical question is whether the other driver’s negligence was the primary cause of the collision.

Consider a common scenario: a motorcyclist is moving between lanes of slow traffic. A driver, without signaling or checking mirrors, makes a sudden lane change directly into the motorcyclist’s path. The rider was lane splitting, which is a traffic violation. But the driver made an unsafe lane change, also a violation, and that lane change directly caused the collision. In that scenario, the driver’s fault likely exceeds the rider’s. The motorcyclist’s damages would be reduced by their share of comparative fault, but recovery remains possible. The Illinois comparative fault framework allows for exactly this kind of proportional allocation.

How Insurers Use Lane Splitting Against Riders

Insurance adjusters seize on lane splitting as a basis to deny or drastically reduce motorcycle accident claims. Their argument is simple: the rider was breaking the law, so the rider caused the accident. This argument is legally incorrect in most cases, but it is effective when riders accept it at face value and walk away from valid claims.

The reality under Illinois law is that a traffic violation is evidence of negligence, not an automatic finding of total fault. The violation must be weighed against the other driver’s conduct. A driver who changes lanes without looking is negligent regardless of whether a motorcycle was lawfully in the adjacent lane or splitting between lanes. The rider’s violation reduces recovery but does not eliminate it. Having an attorney who understands motorcycle insurance claim tactics can prevent you from accepting a wrongful denial.

Protecting Your Claim After a Lane Splitting Accident

If you were lane splitting when a collision occurred, the standard evidence-preservation steps apply with even greater urgency. The police report will likely note the lane splitting. Dashcam footage and traffic camera video become critical to showing what the other driver did. Witness statements can establish that the other driver’s conduct was the primary cause. Your own riding experience, speed, and actions in the moments before the crash all factor into the comparative fault analysis.

Do not admit fault at the scene. Do not accept the insurance adjuster’s characterization of the crash. The legal analysis of a lane splitting accident is nuanced, and the intersection of rider behavior and driver negligence in motorcycle cases requires careful factual development. A claim that looks difficult on the surface may be entirely viable once the evidence is properly examined.

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