If you ride in Illinois, the rules here are not the ones you may remember from a neighboring state. Illinois is one of a small handful of states that never put a helmet mandate back on the books, it still requires eye protection, and it gives motorcyclists no legal room to split lanes. Knowing exactly what the Illinois code says matters most in the days after a crash, when an insurance adjuster is deciding how much your claim is worth.
Here is what is actually true in Illinois, with the statutes and the state figures behind each point.
No helmet law, but eye protection is required
Illinois has no motorcycle helmet requirement for riders or passengers, at any age. The state briefly had one in the late 1960s, and the Illinois Supreme Court struck it down in People v. Fries, holding that forcing an adult to wear headgear for their own protection fell outside the legislature's police power.1 Lawmakers have never passed a replacement, which leaves Illinois in rare company. NHTSA counts just three states, Illinois, Iowa, and New Hampshire, that do not require a helmet for a motorcyclist of any age.2
What Illinois does require is eye protection. Under 625 ILCS 5/11-1404, the operator of a motorcycle and every passenger "shall be protected by glasses, goggles or a transparent shield."3 The statute is specific about what counts: shatter-resistant glasses, goggles that do not block peripheral vision, or a windshield or face shield that reaches above the eyes. Contact lenses do not satisfy it. So a rider can legally go without a helmet, but riding with nothing over the eyes is a violation.
What the numbers say about riding unhelmeted in Illinois
Legal and safe are not the same thing, and the Illinois data shows the gap. In 2023, 172 motorcyclists were killed on Illinois roads.2 Of the riders whose helmet use was known, 60 percent were not wearing one.2 That tracks the national pattern in states like Illinois: NHTSA found that 51 percent of motorcyclists killed in states without a universal helmet law were unhelmeted, compared with 10 percent in states that require helmets for everyone.2
Riding exposed is already the most dangerous way to travel. Per mile traveled, the motorcyclist fatality rate runs almost 28 times that of people in passenger cars.2 None of that creates a legal duty to wear a helmet in Illinois. It does shape how a defense lawyer will look at your case.
Can not wearing a helmet reduce your injury payout?
This is the question that trips up injured riders. In Illinois you have no legal obligation to wear a helmet, so choosing not to is not a traffic violation and not, by itself, a broken rule of the road. The state has taken a similar line with seat belts by statute: failure to wear one "shall not be considered evidence of negligence, shall not limit the liability of an insurer, and shall not diminish any recovery for damages" (625 ILCS 5/12-603.1(c)).4
That does not mean the other side will not try. Illinois follows modified comparative negligence with a 51 percent bar. Under 735 ILCS 5/2-1116, if you are found more than 50 percent at fault for your own injuries you recover nothing, and if you are 50 percent or less at fault your award is reduced by your share of the blame.5 An adjuster may argue that a head injury would have been smaller with a helmet. How much traction that argument gets is fact-specific, which is one reason riders in serious crashes tend to talk to a lawyer before giving a recorded statement. You can start with the Illinois legal directory.
Lane splitting and lane filtering are not legal here
No Illinois statute authorizes lane splitting, riding between two lanes of traffic, and none authorizes lane filtering up to a stoplight. Illinois is not among the states that have legalized the practice. What the code does have is 625 ILCS 5/11-703. Subsection (c) says the driver of a two-wheeled vehicle "may not, in passing upon the left of any vehicle proceeding in the same direction, pass upon the right of any vehicle proceeding in the same direction unless there is an unobstructed lane of traffic available to permit such passing maneuver safely."6 In plain terms, you cannot thread between lanes of stopped or slow cars, because there is no full open lane to move into.
The same section requires you to pass on the left at a safe distance and stay clear of the other vehicle until you can return safely.6 If you split lanes and a crash follows, expect the other driver's insurer to point at that rule when the fault question comes up.
One related risk cuts the other way. In fatal two-vehicle motorcycle crashes nationwide, 46 percent involved another vehicle turning left across a rider who was going straight, passing, or overtaking.2 A driver who turns left into your path is often the one at fault, even where the car driver insists the motorcycle came out of nowhere.
Fault and deadlines in an Illinois crash
Illinois is an at-fault state, so the driver who caused the wreck, and their insurer, pays. A couple of deadlines and a few coverage numbers are worth knowing before you deal with anyone's insurance.
You generally have two years from the date of a crash to file a personal injury lawsuit in Illinois (735 ILCS 5/13-202).7 Miss it and the claim is usually gone, no matter how strong it was. Property damage to the bike runs on a longer clock, but the injury deadline is the one that ends cases.
Every Illinois driver has to carry at least 25/50/20 in liability coverage: $25,000 per person and $50,000 per crash for bodily injury, plus $20,000 for property damage (625 ILCS 5/7-203).8 Those minimums have not moved since 2015, and they go fast in a motorcycle injury. Illinois also requires uninsured motorist bodily injury coverage matching your liability limits, plus underinsured motorist coverage, which is why your own policy matters when the at-fault driver carries only the minimum (215 ILCS 5/143a).9
One more Illinois rule shows up in motorcycle cases. Handheld phone use is banned statewide under 625 ILCS 5/12-610.2, enforced as its own moving violation, and the offense rises to a Class A misdemeanor when it causes great bodily harm and a Class 4 felony when it causes a death.10 If a distracted driver hit you, that citation can carry weight in your claim.
After a crash
Get the official crash report, which records who was where and what the responding officer found. You can pull an Illinois report through the Illinois crash reports page. If your bike was totaled or badly damaged, the repair estimate is not the whole story, because a repaired motorcycle is worth less on resale; that gap is a diminished value claim in Illinois.
Because helmet-optional riders in Illinois face the same 51 percent negligence bar as everyone else, documenting the other driver's fault early, with photos and the crash report, is what protects the value of a claim. Illinois gives motorcyclists a lot of freedom on the helmet question and almost none on lane splitting. The point that holds both together is simple: none of it changes who is responsible when another driver causes the crash.
This article is general information, not legal advice.
Sources
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The People v. Fries, 42 Ill. 2d 446, 250 N.E.2d 149 (1969), CourtListener. https://www.courtlistener.com/opinion/2071888/the-people-v-fries/
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Traffic Safety Facts, Motorcycles: 2023 Data, DOT HS 813 732 (July 2025), NHTSA. https://crashstats.nhtsa.dot.gov/Api/Public/ViewPublication/813732.pdf
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625 ILCS 5/11-1404 (special equipment; motorcycle eye protection), Illinois General Assembly. https://ilga.gov/documents/legislation/ilcs/documents/062500050K11-1404.htm
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625 ILCS 5/12-603.1 (seat belt use; non-use not evidence of negligence and shall not diminish recovery), Illinois General Assembly. https://www.ilga.gov/documents/legislation/ilcs/documents/062500050K12-603.1.htm
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735 ILCS 5/2-1116 (modified comparative negligence, 51% bar), Illinois General Assembly. https://www.ilga.gov/legislation/ilcs/documents/073500050K2-1116.htm
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625 ILCS 5/11-703 (overtaking and passing on the left; two-wheeled vehicles), Illinois General Assembly. https://www.ilga.gov/documents/legislation/ilcs/documents/062500050k11-703.htm
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735 ILCS 5/13-202 (two-year limitations period for personal injury), Illinois General Assembly. https://www.ilga.gov/legislation/ilcs/fulltext.asp?DocName=073500050K13-202
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625 ILCS 5/7-203 (financial responsibility; liability limits), Illinois General Assembly. https://www.ilga.gov/legislation/ilcs/fulltext?DocName=062500050K7-203
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215 ILCS 5/143a (uninsured and underinsured motorist coverage), Illinois General Assembly. https://www.ilga.gov/legislation/ilcs/fulltext?DocName=021500050K143a
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625 ILCS 5/12-610.2 (handheld electronic device use while driving), Illinois General Assembly. https://www.ilga.gov/documents/legislation/ilcs/documents/062500050K12-610.2.htm