Short answer: Illinois law prohibits lane-splitting and lane-filtering under 625 ILCS 5/11-703, which requires every vehicle to stay within a single lane. Unlike California, Illinois has not legalized either practice. A motorcyclist who was lane-splitting at the time of a crash will typically bear significant comparative fault – often enough to bar recovery entirely under Illinois’ modified comparative fault rule (735 ILCS 5/2-1116). However, a rider who was legally positioned in their lane retains a full claim when a driver changed lanes without signaling, failed to check blind spots, or opened a door into traffic. The single most important fact in any motorcycle crash is lane position at the moment of impact.
I’ve handled motorcycle cases where the first thing an insurance adjuster asks is whether the rider was lane-splitting. It’s not an idle question – if you were splitting lanes when the crash happened, that admission can end your case before it starts. But I’ve also represented riders who were doing everything right and still got hit by a driver who drifted without looking. Those cases are winnable, and the damages can be substantial. The legal analysis always comes back to one thing: where was the motorcycle in relation to its lane at the moment of impact?
What Illinois Law Says About Lane Position
625 ILCS 5/11-703 is the controlling statute. It states that a vehicle shall be driven as nearly as practicable entirely within a single lane and shall not be moved from that lane until the driver first ascertains that the movement can be made safely. The statute applies to all vehicles – motorcycles included. There is no exception for filtering through stopped traffic or splitting between lanes at speed.
This matters because lane-splitting and lane-filtering are sometimes confused with legal maneuvers riders see in states like California. They are not legal in Illinois. A rider who moves between lanes of moving or stopped traffic is violating 11-703 regardless of speed or traffic conditions.
Illinois vs. California: How the Laws Compare
California legalized lane-splitting in 2016 and lane-filtering for stopped traffic in 2023. Illinois has considered similar bills but none have passed. The practical result is that a behavior legal in California can wipe out a motorcycle injury claim entirely in Illinois.
| Factor | Illinois | California |
|---|---|---|
| Lane-splitting (moving traffic) | Illegal – 625 ILCS 5/11-703 | Legal since 2016 (CVC 21658.1) |
| Lane-filtering (stopped traffic) | Illegal – same statute | Legal since 2023 (CVC 21658.2) |
| Effect on injury claim if rider splitting | Likely 50%+ fault, bars recovery | May still recover; CHP guidelines apply |
| Legalization bills introduced | Yes, none passed as of 2025 | Passed both chambers, signed into law |
| Rider who is legally positioned | Full claim available | Full claim available |
| Comparative fault rule | Modified (bars recovery at 51%+) | Pure (can recover even at 99% fault) |
How Comparative Fault Works in Motorcycle Cases
Illinois follows modified comparative fault under 735 ILCS 5/2-1116. If a plaintiff is more than 50% at fault for their own injuries, they recover nothing. If they are 50% or less at fault, their damages are reduced by their percentage of fault.
A rider who was lane-splitting will almost certainly be assigned more than 50% fault by a jury – which means a complete bar on recovery. Insurance adjusters know this. They will investigate the crash scene, review any available video, and ask witnesses about the motorcycle’s position. If the rider was between lanes, the adjuster will argue a clear-cut contributory fault defense.
Conversely, a rider who was properly within their lane has no contributory fault from lane position. The entire focus shifts to the other driver’s negligence – and that driver has no lane-splitting defense to hide behind.
The single most important fact in any Illinois motorcycle crash case is the rider’s lane position at the exact moment of impact. Everything else – speed, road conditions, driver inattention – is secondary to that one question. A legally-positioned rider has a strong claim. A lane-splitting rider faces an uphill battle that can be impossible to win.
When Legally-Riding Motorcyclists Have Strong Claims
Most motorcycle crashes in Illinois do not involve lane-splitting. They involve drivers who fail to see a motorcycle that has every right to be where it is. Common scenarios where legally-positioned riders have strong claims include:
- Unsafe lane changes: A driver drifts into the motorcycle’s lane without signaling or checking mirrors – a direct violation of 625 ILCS 5/11-803.
- Left-turn crashes: A driver turning left fails to yield to an oncoming motorcycle. These are among the most common and most deadly motorcycle crash patterns.
- Dooring: A parked driver opens their door into the path of a legally-riding motorcyclist. The opening driver is at fault under 625 ILCS 5/11-1407.
- Rear-end collisions: A following driver fails to leave adequate stopping distance and strikes a motorcyclist from behind.
- Failure to yield at intersections: A driver running a stop sign or red light strikes a motorcyclist in the intersection.
In each of these scenarios, the rider’s legal lane position eliminates the most common defense the at-fault driver would otherwise use.
Multiple Liable Parties in Motorcycle Crashes
Motorcycle crashes frequently involve more than one at-fault party. Identifying all of them matters because a single defendant may not have enough insurance coverage to fully compensate a seriously injured rider.
The at-fault driver and their insurer are the obvious starting point. But other parties may share liability:
- Municipality or IDOT: Road defects – potholes, missing signage, inadequate markings, loose gravel – can contribute to a crash. Claims against government entities require notice under the Illinois Local Governmental and Governmental Employees Tort Immunity Act (745 ILCS 10) and have specific procedural requirements.
- Equipment manufacturers: Defective motorcycle components (brakes, tires, throttle systems) or defective vehicle components (a car with a malfunctioning turn signal) can create product liability claims under strict liability theories.
- An employer: If the at-fault driver was on the job at the time of the crash, their employer may be vicariously liable under respondeat superior principles.
What Happens if You Were Lane-Splitting
If you were lane-splitting when the crash happened, you face serious legal obstacles – but the situation is not automatically hopeless. A few considerations:
First, comparative fault is still assessed on the totality of conduct. If the other driver was egregiously negligent – running a red light, driving drunk, making an illegal U-turn – a fact-finder might assign less than 50% fault to the rider despite the lane-splitting. This is a difficult argument to make, but it is not impossible.
Second, lane position at the moment of impact is what matters, not what occurred in the seconds before. If you had returned to your lane before the crash, the lane-splitting may be less relevant to the liability analysis.
Third, preserving evidence matters immediately. Camera footage, witness statements, and the physical evidence at the crash scene can all bear on the question of lane position. An attorney should be involved early.
What to Do After a Motorcycle Crash in Illinois
Regardless of lane position, certain steps protect your claim after any motorcycle crash:
- Call 911 and wait for a police report – the officer’s diagram of vehicle positions is significant evidence.
- Photograph your motorcycle’s position before anything is moved.
- Get contact information from all witnesses.
- Seek medical attention immediately, even if injuries seem minor. Adrenaline masks pain, and gaps in treatment are used against claimants.
- Do not give a recorded statement to any insurance company before speaking with an attorney.
- Contact an attorney before the insurance adjuster reaches you – they will call quickly, and early statements can be damaging.
If you were injured in a motorcycle crash anywhere in the Chicago area, you can reach Phillips Law Offices at (312) 346-4262 for a free consultation.
Frequently Asked Questions
Is lane-splitting legal in Illinois?
No. Lane-splitting and lane-filtering are both illegal in Illinois under 625 ILCS 5/11-703, which requires vehicles to remain within a single lane. Illinois has not passed any legislation to legalize these practices, unlike California which allows both.
Can I still sue if I was lane-splitting when the crash happened?
It is very difficult. Under Illinois’ modified comparative fault rule (735 ILCS 5/2-1116), you cannot recover if you are more than 50% at fault. A lane-splitting rider will almost always be assigned more than 50% fault, which bars recovery entirely. The exception would be extreme negligence by the other driver that limits the rider’s fault to 50% or less.
What if a car changed lanes into me while I was legally in my lane?
A driver who changes lanes without first ensuring the movement can be made safely violates 625 ILCS 5/11-803. If you were properly within your lane, you have a strong negligence claim against that driver. Your lane position eliminates their most common defense, and your damages – medical bills, lost income, pain and suffering – are fully recoverable subject to any fault assigned to you.
How long do I have to file a motorcycle crash lawsuit in Illinois?
The general personal injury statute of limitations in Illinois is two years from the date of injury under 735 ILCS 5/13-202. If the crash involved a government-owned vehicle or a road defect, notice requirements may shorten the effective deadline significantly. Do not wait to speak with an attorney.
Can a municipality be liable for road conditions that contributed to a motorcycle crash?
Yes, but claims against government entities are more complex. The Illinois Tort Immunity Act (745 ILCS 10) provides immunities to local governments, but liability can still attach for conditions like potholes, missing signage, or inadequate road surface when the government had actual or constructive notice of the defect. Strict notice requirements and shorter deadlines apply to these claims.
Authoritative Sources
- 625 ILCS 5/11-703 – Driving on Roadways Laned for Traffic
- 735 ILCS 5/2-1116 – Modified Comparative Fault
- 735 ILCS 5/13-202 – Personal Injury Statute of Limitations
- 745 ILCS 10 – Local Governmental and Governmental Employees Tort Immunity Act
- 625 ILCS 5/11-803 – Turning and Required Signals
