Two adjusters, two answers
Each insurer runs its own liability review, so the carriers can assign you very different fault percentages for the same collision. Neither number is official until both sides act on it or a court replaces it.
Deer Crossing
Told You Were 40 Percent at Fault? Here Is Who Decided That and What They Read
Fault percentages come from claims adjusters reading a small stack of documents, and knowing which documents carry weight tells you where to push back.
how injury claims from vehicle collisions are handled and paid for in the United States, from fault determination through settlement
Citations versus narratives
A ticket written at the scene carries real weight with adjusters because it reflects an officer's contemporaneous judgment backed by state law. The officer's written opinion about cause, by contrast, is often inadmissible in court and is only one input among many.
Correcting a crash report
Police departments will usually accept a supplemental statement or issue an amended report when a factual detail such as direction of travel or lane position is wrong. Conclusions and opinions are far harder to change, so focus on verifiable facts.
The number that decides how much of your claim gets paid is usually set by a person you will never meet, working from a file that fits in a folder. That person is a liability adjuster, employed by one of the insurers involved, and the percentage they write down (0, 30, 50, 100) is an opinion rather than a finding of law. No judge signs it. No agency reviews it. It becomes real because both insurers act on it and because most claims close without anyone testing it. Knowing what goes into that folder is the first practical step toward changing what comes out.
The adjuster is the first decider, and often the only one
Each insurer assigns its own adjuster, and each reaches an independent conclusion, which is why you can be told you were 30 percent at fault by one carrier and 70 percent by the other in the same week. When the two disagree and the money at stake is large enough, the carriers may send the dispute to inter-company arbitration, a private process run between insurers that produces a split neither of them can appeal. Short of that, the percentage stands until someone files suit. Most people never do. The decision that shapes the entire payout is therefore made administratively, quickly, and on paper.
What the police report actually contributes
The crash report is the document readers overweight most. It carries genuine value: it fixes the date, time, location, weather, vehicle positions, and the officer's diagram, and it records whether a citation was issued, which matters because a citation for failure to yield or following too closely is strong evidence an adjuster will lean on. But the officer's narrative opinion about who caused the collision is not binding on anyone, and in many states it is not admissible in court. Officers arrive after the fact. They write what witnesses and drivers told them, sometimes compressed into two lines.
The careful reader checks the report for errors of fact before checking it for conclusions, because factual errors are correctable and conclusions rarely are. Look at whether the vehicles are numbered the way you think, whether the direction of travel is right, whether the diagram shows your car in the correct lane, and whether a witness you remember speaking to appears anywhere. Departments will accept a supplemental statement or issue an amended report when a detail is demonstrably wrong. The National Highway Traffic Safety Administration oversees federal crash data standards that shape how many of these forms are structured, which is why the codes look similar across state lines.
The rest of the file, which usually matters more
Adjusters read photographs of both vehicles and of the scene, because crush patterns and point of impact tell a story the narrative may not. They read the recorded statements each driver gave, listening for admissions and for changes between the first telling and the second. They read independent witness contact information, which is worth more than the witness's summarized quote, since an adjuster can call and you cannot un-ring a favorable call. They read repair estimates for damage location, and increasingly they pull event data recorder downloads showing speed, braking, and steering in the seconds before impact. Dashcam footage, when it exists, ends most arguments outright.
How your state's rule turns the percentage into dollars
The same 30 percent means different things depending on where the crash happened. Under pure comparative negligence, you recover your damages reduced by your share, so a 100,000 dollar claim at 30 percent fault pays 70,000. Under modified comparative negligence, the same reduction applies but only up to a threshold, either 50 or 51 percent depending on the state, above which you recover nothing at all. A handful of jurisdictions still apply contributory negligence, where any fault of your own, even one percent, bars recovery entirely. That last rule explains why some adjusters fight hard over small slices.
The arithmetic also explains where negotiation pays. In a modified state, moving from 51 to 49 percent is the difference between zero and roughly half, so evidence aimed at that boundary is worth assembling carefully. In a pure comparative state, every ten points moved is simply ten percent more money, which makes incremental argument worthwhile at any level. Ask the adjuster, in writing, to state the percentage assigned and the specific facts supporting it. The written answer is short, it is discoverable later, and it tells you exactly which document you need to correct.