Fault in a truck accident in Illinois is decided under the state’s modified comparative negligence law, federal trucking safety regulations, and the evidence preserved in the first days after the crash. You can recover compensation as long as you are 50 percent or less at fault, and where the case is filed matters: a wreck on the Dan Ryan or I-55 is typically litigated in the Circuit Court of Cook County’s Law Division at the Daley Center, while a crash on I-88 or I-80 may belong in DuPage or Will County. An 80,000-pound tractor-trailer can cause catastrophic injuries in a moment, and everything that follows depends on proving who was responsible.
This article explains how fault is determined after an Illinois truck crash, why these cases are more complicated than ordinary car accidents, and what that means for your recovery.
When two cars collide, the investigation usually focuses on two drivers. A truck crash is different. The driver may work for a motor carrier that owns the tractor, while a different company owns the trailer. A shipper or freight broker may have arranged the load, a separate contractor may have loaded the cargo, and yet another company may have handled maintenance. Any one of them may share responsibility for what happened.
The stakes are higher too. According to the FMCSA, 5,837 large trucks were involved in fatal crashes in 2022, and there were approximately 503,000 police-reported crashes involving large trucks in the United States that year, based on the agency’s Large Truck and Bus Crash Facts 2022. Because the injuries are often severe and several businesses may be on the hook, trucking and insurance companies fight hard over fault in a truck accident from day one.
Most Illinois truck accident claims are built on negligence. In plain terms, a negligence claim asks four questions. Did the defendant owe you a duty of care? Every driver on an Illinois road owes others a duty to drive with reasonable care, and trucking companies owe duties to hire qualified drivers and keep their equipment safe. Did the defendant breach that duty? Speeding, following too closely, driving while fatigued, or skipping required maintenance can all be breaches. Did the breach cause the crash and your injuries? And did you suffer damages, such as medical expenses, lost wages, or lasting disability?
Proving each element takes evidence, and in a trucking case much of that evidence sits in the hands of the trucking company. That is one reason experienced Illinois truck accident lawyers move quickly to preserve records before they disappear.
Illinois follows a rule called modified comparative negligence, found at 735 ILCS 5/2-1116. Under the statute, you are barred from recovering damages if the trier of fact finds that your own contributory fault is more than 50 percent of the proximate cause of your injury. If your share of fault is 50 percent or less, you can still recover, but your damages are reduced in proportion to your percentage of fault.
Here is what that looks like in practice. Suppose a jury finds your total damages are $500,000 and decides you were 20 percent at fault because you were driving slightly over the speed limit when a truck turned across your lane. Your award would be reduced by 20 percent, leaving $400,000. If the jury instead put 51 percent or more of the blame on you, you would recover nothing at all.
That cliff at the 50 percent line explains a great deal about how these cases are litigated. Insurance companies know that every percentage point of fault they shift onto you saves them money, and pushing you past the halfway mark eliminates the claim entirely. Building a clear, well-documented picture of fault in a truck accident is not a formality. It is the whole ballgame.
Commercial trucking is governed by the Federal Motor Carrier Safety Regulations, and violations of those rules are often powerful evidence of negligence. The hours-of-service rules in 49 CFR 395.3 generally limit a property-carrying driver to 11 hours of driving after 10 consecutive hours off duty, all within a 14-hour window, and cap on-duty time at 60 hours in 7 days or 70 hours in 8 days. A driver must also take a 30-minute break after 8 hours of driving time. Related federal rules require carriers to systematically inspect, repair, and maintain their vehicles and to keep records proving they did.
When a driver blows past the driving limits or a carrier ignores a failing brake system, those violations help establish that the company breached its duty of care. Fatigue, speeding, and poor maintenance appear again and again in serious wrecks, a pattern we discussed in our post on the most common causes of truck accidents on Illinois highways. Matching the crash evidence against the federal rulebook is one of the most effective ways to prove fault in a truck accident.
Several investigations often run at the same time. Local police or the Illinois State Police respond to the scene, document what they find, and prepare a crash report. In serious crashes, specially trained officers may complete a full reconstruction. Meanwhile, the trucking company’s insurer frequently sends its own rapid response team, sometimes within hours, to gather evidence and build a defense.
Your legal team conducts its own investigation. Key evidence includes electronic logging device data showing the driver’s hours, the truck’s event data recorder, dashcam and surveillance video, maintenance and inspection records, the driver’s qualification and drug testing files, freight and dispatch records, and witness statements. Who can be held accountable is also a moving target in the courts. The United States Supreme Court’s recent decision in Montgomery v. Caribe Transport II changed the landscape for injured people, and we broke down what it means in our post on Montgomery v. Caribe and truck crash victims.
Once fault percentages are assigned, they shape every dollar of the outcome. If several defendants share responsibility, each one’s role matters for how the judgment is paid. If the defense convinces an adjuster or jury that you were partly to blame, your recovery shrinks by that percentage, and if they push you over the 50 percent line, it disappears.
This is why you should be careful about giving recorded statements or accepting an early settlement before the full picture of fault is known. Truck crash injuries often turn out to be more serious than they first appear, and fault often turns out to be more favorable to the victim once the trucking company’s own records come to light. A thorough investigation protects both.
A real example from our firm’s practice: our client was a passenger in a vehicle that crashed into an overturned semi after the truck driver lost control and failed to warn approaching traffic. He suffered a femur fracture that required surgery, and we recovered a $1.4 million settlement. Every case is different, and past results do not guarantee future outcomes.
Fault is determined through Illinois negligence law, the comparative fault statute (735 ILCS 5/2-1116), and evidence measured against federal safety regulations. Investigators rely on the police crash report, electronic logging data, event data recorders, video, maintenance records, and witness statements.
If your share of fault is 50 percent or less, you can still recover, but your damages are reduced in proportion to your percentage of fault. If your fault is more than 50 percent, Illinois law bars recovery entirely.
Police or the Illinois State Police investigate at the scene, the trucking company's insurer often sends its own rapid response team within hours, and your legal team conducts an independent investigation to preserve and analyze the evidence.
If you or a loved one was hurt in a crash with a semi truck, box truck, or other commercial vehicle, do not let the trucking company’s insurer decide the story of what happened. Collins Law Group, P.C. investigates truck crashes across Illinois, preserves the evidence that proves fault, and fights for full compensation for catastrophic injuries. We offer free consultations, and you pay nothing unless we recover for you. Contact Collins Law Group today to talk with a lawyer about how fault may be determined in your case and what your claim may be worth.
John D. Risvold is an equity partner at Collins Law Group, P.C. in Naperville, Illinois. He represents individuals and families in catastrophic personal injury and wrongful death cases, focusing on commercial trucking crashes, rideshare and autonomous vehicle litigation, medical malpractice and birth injury, and product defect claims. He has tried cases to verdict in Illinois courts, recovered more than $50 million for clients over thirteen years of practice, and has been named to Best Lawyers in America for Personal Injury Litigation and Illinois Super Lawyers.
This article is for general information only and is not legal advice. Reading it does not create an attorney-client relationship. Every case is different; if you have been injured, speak with a lawyer about your specific situation.
