After a car accident, fault isn’t always black and white. Sometimes both drivers share some responsibility. Sometimes one driver made a mistake but the other was also doing something they shouldn’t have been. Illinois has a specific legal framework for handling these situations, and understanding how it works can make a real difference in how your claim plays out.
A Cicero car accident lawyer can help evaluate the evidence, push back against inflated fault assignments, and make sure the comparative fault analysis reflects what actually happened rather than what the insurance company finds most convenient.
Illinois Follows Modified Comparative Fault
Illinois uses a modified comparative fault system, sometimes called the 51% rule. What that means practically is that you can still recover compensation even if you were partially at fault for the accident, but only up to a point.
If you’re found to be 50% or less at fault, you can recover damages. Your compensation gets reduced by your percentage of fault, but it doesn’t disappear. If you’re assigned 51% or more of the blame, you can’t recover anything at all.
That threshold matters. A lot. And it’s exactly why insurance companies work so hard to push fault onto the other driver.
How Fault Gets Determined
Fault isn’t assigned by a single person or a single document. It’s built from a combination of evidence including:
- Police reports and officer observations at the scene
- Witness statements
- Traffic camera or dashcam footage
- Physical evidence like skid marks, vehicle damage, and road conditions
- Accident reconstruction analysis in more serious cases
Illinois follows 625 ILCS 5/11-601, which establishes general rules of the road that form the baseline for evaluating driver conduct. Violations of those rules weigh heavily in fault determinations.
Why Insurers Try to Inflate Your Fault Percentage
This is worth understanding before you talk to anyone from the other driver’s insurance company. Every percentage point of fault they can assign to you reduces what they have to pay. If your damages total $100,000 and they can argue you were 30% at fault, they’ve just reduced their exposure by $30,000. If they can push you past that 51% threshold, they owe you nothing.
Adjusters are trained to ask questions and gather information in ways that can be used to build that case against you. That’s not cynicism. That’s just how the process works.
What This Means for Your Case
The practical takeaway is that how you handle the aftermath of an accident matters as much as what actually happened. What you say, what you document, and how quickly you get legal guidance all feed into how fault ultimately gets assigned.
Illinois law gives you two years from the date of the accident to file a personal injury lawsuit under 735 ILCS 5/13-202. But building a strong response to a fault dispute takes time and evidence. Waiting too long makes both harder.
Disparti Law Group Accident & Injury Lawyers works with car accident victims throughout the Cicero area to make sure fault determinations are challenged when they should be and that clients understand exactly where they stand before any decisions get made. Reach out to a Cicero car accident lawyer to get a clear picture of how Illinois fault rules apply to your specific situation.









