After a crash with a commercial truck, the insurance adjuster’s first call to you often starts the same way: you were partly to blame. Following too close. Changing lanes without signaling. Slow to yield.
Here’s what that adjuster won’t tell you. Being partially at fault in a truck accident does not automatically end your case in Illinois.
Our state runs on what’s called modified comparative fault. In plain terms: you can share some of the blame for a crash and still recover real money, as long as your share of the blame stays under one specific line.
This article provides general legal information; consult a licensed Illinois attorney for advice specific to your situation.
Illinois Modified Comparative Fault: The 51 Percent Rule Explained
That line comes from a statute, 735 ILCS 5/2-1116, and it works on two rules. Learn these, because they decide whether your claim is worth pursuing at all.
- The 51 percent bar: Go over 50 percent at fault, meaning 51 percent or more, and you recover nothing. Not a reduced amount. Nothing.
- Proportional reduction at 50 percent or under: Stay at 50 percent fault or below, and your damages are reduced by your own percentage of fault. You keep the rest.
Compare that to a “contributory negligence” state, where any fault at all on your part can wipe out your case completely. Illinois works differently. Juries assign a fault percentage to everyone involved, and the award follows that math.
How Fault Percentages Affect Your Recovery: Hypothetical Illustrations
Numbers make this rule easier to see than definitions do. The illustrations below are hypothetical; every real case turns on its own facts. But the arithmetic behind 735 ILCS 5/2-1116 never changes.
- 20% fault: A jury awards $500,000 in damages and finds you 20 percent at fault. You collect $400,000.
- 35% fault: Damages of $300,000, and you’re found 35 percent at fault. Your recovery drops to $195,000.
- 50% fault: Damages of $200,000, and you’re found exactly 50 percent at fault. You still recover $100,000. Fifty percent is the last stop before the cliff.
- 51% fault: Same $200,000 in damages, but now you’re found 51 percent at fault. You recover zero. That’s the bar in action.
One percentage point separates the third scenario from the fourth. In the third, you walk away with $100,000. In the fourth, you walk away with nothing.
Sit with that for a second. That’s exactly why insurance defense teams fight so hard over fault percentages in truck litigation. One point can be the whole case.
Joint Liability Among Multiple Defendants
Most truck cases don’t have just one defendant. There’s the driver, the trucking company, maybe a maintenance contractor or a cargo loader who packed the trailer wrong.
Under 735 ILCS 5/2-1117, Illinois limits joint and several liability for most defendants, with one carve-out: your medical expenses stay recoverable in full from any defendant regardless of their fault percentage. For your other damages, a defendant found less than 25 percent at fault is generally on the hook only for their own share, not the whole judgment. A defendant found 25 percent or more at fault stays jointly and severally liable for the full award.
Here’s where it gets uncomfortable. If one of those defendants turns out to be broke or uninsured, your ability to collect the full judgment can hinge entirely on which other defendants carry joint liability. We’ve seen cases won at trial and then partly lost at the collection stage, simply because the liability structure wasn’t built with that risk in mind. An attorney familiar with Illinois truck accident laws builds the claim around all the parties who can actually pay.
How Trucking Companies Use Blame-Shifting Tactics
Trucking carriers and their insurers litigate for a living. They know that pushing your fault percentage past 50 wipes out their liability, and that every point below 50 shaves money off what they owe. We see the same playbook again and again:
- Alleging speeding or aggressive driving: Pointing to your pre-crash speed, even if it fell within normal traffic flow, to inflate your share of fault.
- Claiming distracted driving: Digging through cell phone records or dashcam footage of the cab interior to suggest you weren’t paying attention.
- Asserting failure to yield or an improper lane change: Arguing you created the danger by drifting into the truck’s blind spot or cutting it off.
- Emphasizing pre-existing injuries: Suggesting part of your medical bills and pain trace back to conditions you had before the crash, shrinking what the defendant owes.
None of this is necessarily an accurate picture of what happened. It’s litigation strategy, built to move a percentage point in the carrier’s favor. We counter it with independent accident reconstruction, the truck’s own electronic data preserved before it disappears, and a hard look at the driver’s hours-of-service logs and qualification file.
How Fault Is Determined at Trial
In Illinois, a jury decides fault. Illinois’s pattern jury instructions on comparative fault tell jurors how to assign a fault percentage to each party and how to reduce the plaintiff’s award to match. Jurors weigh witness testimony, physical evidence, and expert reconstruction, then land on percentages meant to reflect what each party actually contributed to the crash.
That’s why the evidence you put in front of a jury matters so much. An accident reconstruction expert who can walk jurors through exactly how the crash happened, and why the truck driver’s actions caused most of it, can be the difference between a percentage you can live with and one that crosses the 51 percent line. We’ve built entire cases on depositions of the driver, the carrier’s safety director, and the eyewitnesses who saw it unfold.
Why Acting Quickly Protects Your Claim
Illinois generally gives you two years from the date of the crash to file a personal injury claim, under 735 ILCS 5/13-202. Miss that deadline and it doesn’t matter how strong your case was. It’s over.
The clock matters for another reason too. Truck companies have their own investigators and incident response teams, and they start building their version of events within hours of the crash, not weeks. Getting an attorney who can send a legal hold letter, pull the truck’s black box data, and bring in an independent reconstructionist before that evidence gets lost or overwritten is one of the highest-value moves you can make early on.
Talk to a Chicago Attorney for a Free Consultation
If you or a family member has been affected by a truck crash in Illinois, even if you believe you may share some fault, the attorneys at Phillips Law Offices are here to help. Call (312) 346-4262 or contact us online for a free, no-obligation consultation. We analyze fault allocation honestly, challenge blame-shifting tactics with evidence, and work to maximize the recovery available to you under Illinois law.
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