Key Takeaways
- A police report is not a finding of fault. An officer’s opinion is not binding on anyone, and a citation does not settle the civil case.
- A traffic ticket is evidence, not proof. In Illinois a statutory violation is prima facie evidence of negligence, which the other side may rebut.
- Proximate cause is a separate question. Proving a violation does not prove it caused the injury.
- Most percentages are negotiated, not adjudicated. Very few cases reach a jury, so the number usually comes from the evidence each side holds.
- Physical evidence disappears in days. Vehicles are repaired or scrapped and footage is overwritten on a cycle.
The question this article answers
Illinois bars recovery only where your share of the fault is more than 50%, and reduces your damages below that line. That rule, in 735 ILCS 5/2-1116, is set out in full in the Illinois 51% fault rule.
This article is about the other half of the problem: where the percentage comes from in the first place. Knowing that 51% is fatal tells you nothing about how anyone arrives at 51%.
What a police report does and does not do
The single most common misunderstanding after a crash is that the police report decides fault. It does not.
An officer usually arrives after the event, takes accounts from people with an obvious interest in the outcome, and records an opinion. That opinion is useful. It is not a legal finding, it does not bind an insurer, a judge or a jury, and reports are corrected more often than most people expect.
This cuts both ways. A report that reads badly for you is not the end of your claim, and a report that reads well is not the end of the argument.
A citation is evidence, not proof
The same applies, with more force, to a traffic ticket. Illinois does not treat a traffic violation as automatically establishing negligence.
Under the Illinois Pattern Jury Instructions, a violation of a statute designed to protect human life or property is prima facie evidence of negligence, following Davis v. Marathon Oil Co., 64 Ill. 2d 380 (1976). Two consequences follow, and both are frequently missed:
- It is rebuttable. The other driver may offer evidence that explains or excuses the violation. The ticket creates a strong starting point, not a closed question.
- Proximate cause is still yours to prove. Showing that a driver broke a rule does not show that breaking it caused your injury. These are separate elements, and they are argued separately.
Any source telling you that a ticket “proves” the other driver was negligent in Illinois is overstating the law. The elements are covered in Illinois car accident negligence laws.
What actually moves the percentage
| Evidence | Why it carries weight | How long it lasts |
|---|---|---|
| Vehicle damage | Impact points and crush patterns are hard to argue with | Until the car is repaired or scrapped, often weeks |
| Nearby camera footage | Neutral, and settles disputes about signals and speed | Commonly overwritten on a short cycle |
| Independent witnesses | No stake in the outcome, unlike the drivers | Memory fades; contact details are lost at once |
| Scene photographs | Positions, debris, sightlines, road conditions | Only if someone takes them that day |
| Your own medical records | Gaps in treatment are used to argue the injury is minor | Created as you go; gaps cannot be filled later |
The pattern is worth noticing. The evidence that moves a fault percentage is the evidence that expires fastest. By the time an insurer makes a serious offer, most of it has usually gone, and the percentage is then argued from whatever survived.
How adjusters build a number
An insurance adjuster is not a neutral arbitrator. Their number is an opening position, and it is assembled from a small number of familiar moves:
- The recorded statement. Open questions invite small concessions, and “I may have been going a little fast” is a percentage point.
- Stacked minor allegations. Several small criticisms, none decisive alone, aimed together at the line above half.
- Delay. Time removes evidence, and evidence is what contradicts their figure.
- An early offer. Made while your treatment is incomplete, so the injury looks smaller than it is.
None of this is improper. It is ordinary claims handling, and it works because most people are not gathering anything in the same period.
What you can do in the first two weeks
- Photograph everything before vehicles move, including the wider scene and road conditions.
- Get names and numbers for anyone who stopped, not just the other driver.
- Identify cameras facing the location, and ask for the footage in writing quickly.
- Attend treatment consistently. Gaps are used against the value of the claim.
- Be careful with recorded statements to the other driver’s insurer, which you are generally not obliged to give.
What to do in the hours immediately afterwards, including reporting duties, is in what to do after a car accident in Illinois.
پوښتل شوې پوښتنې
Does the police report decide who was at fault?
No. An officer’s report records an opinion, usually formed after the event from accounts given by people with an interest in the outcome. It is useful evidence but it is not a legal finding, it does not bind an insurer or a jury, and reports are corrected more often than people expect.
If the other driver got a ticket, does that prove they were negligent?
Not by itself. In Illinois a violation of a statute designed to protect human life or property is prima facie evidence of negligence, following Davis v. Marathon Oil Co., 64 Ill. 2d 380 (1976). The other side may rebut it, and you must still prove that the violation proximately caused your injury.
Who assigns the fault percentage?
A jury apportions fault in a case that is tried. Most cases settle instead, and in those the percentage is negotiated between the parties. That is why the evidence each side holds matters more than any early opinion about who was to blame.
Should I give a recorded statement to the other driver’s insurer?
You are generally not obliged to give one to the other driver’s insurer, and it is worth taking advice first. Recorded statements are commonly used to obtain small concessions about speed or attention that later support a higher fault percentage against you.
How quickly does evidence disappear?
Faster than most claims move. Nearby camera footage is commonly overwritten on a short cycle, damaged vehicles are repaired or scrapped within weeks, and witness details are usually lost at the scene if nobody collects them that day.
Can my fault percentage change after the insurer states it?
Yes. An adjuster’s figure is a negotiating position rather than a determination. It moves when it is met with evidence, which is the main reason to gather photographs, footage and witness details before they are gone.
Talk to an Elmwood Park car accident lawyer
The fault percentage in an Illinois car accident case is not discovered. It is built, out of whatever evidence still exists when someone finally looks for it. That is why the first two weeks matter far more than their share of the timeline suggests.
If you were hurt in a crash in Elmwood Park, Oak Lawn, Skokie, Niles, Orland Park or anywhere in Cook County, Lawyer Furqan will go after footage and witnesses while they still exist, rather than responding to the insurer’s number once they do not.
Call 847-800-8978 or contact us online. The consultation is free, there is nothing upfront, and you owe no attorney’s fee unless we win.
Sources and authorities cited
- Illinois Pattern Jury Instructions, Civil, 60.00 · statutory violation as prima facie evidence of negligence, citing Davis v. Marathon Oil Co., 64 Ill. 2d 380 (1976)
- 735 ILCS 5/2-1116 · damages reduced by the plaintiff’s share, barred above 50%
- 625 ILCS 5/11-407 · duty to give immediate notice of a crash to police
This article is general legal information about Illinois law, not legal advice, and creates no attorney-client relationship. How fault is apportioned depends on the evidence in each case, and nothing here predicts a result.
