After a Chicago car accident, one question comes up quickly: who is at fault? Illinois answers that question using a rule that directly affects compensation, even though many people have never heard of it.
Illinois uses a modified fault rule
Illinois is an at-fault state. The driver who causes the crash holds financial responsibility. Fault, however, is often shared between drivers.
Illinois follows a rule known as modified comparative negligence. Under Illinois law (735 ILCS 5/2-1116), you may recover damages as long as you are no more than 50% responsible for the crash. If your share of fault exceeds 50%, the law bars recovery. If your fault is 50% or less, the law reduces your damages by that percentage.
What modified comparative negligence means in plain terms
The legal label is confusing but the rule itself is simple. Illinois sets a cutoff point and reduces compensation based on fault. Here is how it works in practice:
- No fault: You may recover all proven damages.
- Shared fault: Your recovery drops by your percentage of fault.
- More than half at fault: You recover nothing.
Fault percentages matter because small differences change outcomes. A driver who is 47% responsible may still recover damages. A driver who is 51% responsible may recover nothing.
Illinois takes this approach to shared responsibility. The law allows recovery when drivers share fault but it stops recovery when one party caused most of the harm.
How fault is usually determined
Fault develops over time and does not come from one decision-maker. A full fault analysis often relies on several sources:
- Police reports: Officer observations and cited violations.
- Insurance investigations: Statements, photos and vehicle damage.
- Traffic laws: Speed limits, right of way rules and signaling duties.
If disputes continue, a judge or jury assigns fault percentages. They compare each party’s conduct against Illinois traffic and negligence standards.
Why legal guidance may matter
Fault rules look straightforward on paper but real cases often involve disputes. Insurance companies challenge fault percentages because even small changes can reduce payouts.
An attorney can review evidence, apply Illinois traffic laws and evaluate how fault may be assigned under the modified comparative negligence rule. This analysis may help identify weaknesses in an insurance company’s position and clarify how shared responsibility affects recovery.