HOW INSURANCE COMPANIES DECIDE FAULTGet More. Get It Faster. Get It With Sam Aguiar.
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Adjusters Work for the Insurance Company
After a car accident, the at-fault driver’s insurance company assigns a claims adjuster to your case. That adjuster’s role is to limit the amount their company pays out. Every decision they make, from how they read the police report to how they weight witness statements, is filtered through that financial lens.
Adjusters are trained investigators. They review physical evidence, pull camera footage, analyze damage patterns, and sometimes bring in professional accident reconstruction firms. The information they gather shapes an official fault percentage that directly controls your settlement offer. Understanding that process is the first step to protecting your claim.
Police Reports Are the Starting Point
Every adjuster starts with the official police report. It contains the responding officer’s narrative, a crash diagram, contributing factor codes, citation information, and preliminary fault observations. A citation issued at the scene, for speeding, running a red light, or failure to yield, is a powerful indicator of negligence that adjusters use immediately.
The police report is not the final ruling on civil liability. Officers write reports under time pressure without the benefit of full investigation, and their conclusions can be wrong or incomplete. Adjusters know this, so they treat the report as a starting point and build on it. If the report leaves any ambiguity, they will use it against your claim.
Watch Out: Recorded Statements
Adjusters often contact injured people within 24–48 hours of a crash and ask for a recorded statement. They frame it as routine paperwork. In reality, any phrase you use, “I didn’t see them coming,” “I may have been going a little fast”, can be used to push fault percentages in your direction. You are not required to give a recorded statement to the other driver’s insurer.
Scene Evidence
Physical evidence at the crash scene tells a story that words can’t change. Trained adjusters and accident reconstruction professionals analyze skid mark length and direction to estimate pre-impact speed. They study vehicle damage patterns, where the cars made contact and at what angle, to reconstruct the exact sequence of the collision.
Debris fields, final resting positions of vehicles, and road surface conditions all contribute to the picture. If your car shows frontal damage consistent with rear-ending another vehicle, that physical evidence will be used against a claim that the other driver cut you off without warning.
Witness Statements and Camera Footage
Independent eyewitnesses carry significant weight in fault investigations because they have no financial stake in the outcome. Adjusters seek out and formally interview anyone who saw the crash from a neutral vantage point. Those accounts are then cross-referenced against each driver’s version of events to identify inconsistencies.
Simultaneously, adjusters work to pull every available video record. Traffic cameras, business surveillance systems, dashcams, and even nearby homeowners’ Ring devices are all potential evidence sources. Time is critical here, many systems overwrite footage within 24 to 72 hours. If the video shows the crash clearly, it often determines fault on its own.
Your Car’s Event Data Recorder
Most vehicles manufactured after 2014 contain an Event Data Recorder (EDR), a device that captures the 5 seconds before and during a collision. It records vehicle speed, braking input, throttle position, steering angle, and whether seatbelts were engaged. Insurance companies and reconstruction analysts can extract this data to confirm or contradict what drivers claim happened. If your EDR data shows you were traveling at 65 mph in a 40-mph zone with no pre-impact braking, that information will be central to the fault determination.
Accident Reconstruction
In serious crashes involving significant injury, death, or contested liability, insurance companies bring in professional accident reconstruction analysts. These engineers use the evidence gathered in previous steps, along with physics-based modeling, road surface measurements, and vehicle dynamics data, to produce a formal reconstruction of how the collision occurred.
- Speed calculations from crush depth, skid mark length, and momentum analysis
- Pre-impact trajectory modeling based on debris and tire marks
- EDR data cross-referenced with witness accounts
- Traffic light cycle timing to verify who had the right of way
- Weather and road condition data for the time of the crash
Reconstruction reports carry significant authority in both settlement negotiations and litigation. They are expensive to produce and equally expensive to challenge, which is one reason having an attorney review contested fault findings before you accept a settlement matters.
How Sam Aguiar Injury Lawyers Respond to Adjuster Investigations
When you retain Sam Aguiar Injury Lawyers, we step between you and the adjuster immediately. We issue preservation letters to lock down camera footage and EDR data before it disappears. We gather our own witness statements and, when needed, retain independent reconstruction analysts whose conclusions aren’t filtered through the insurance company’s financial interest.
Our Bigger Share Guarantee® means you take home more of your settlement. We keep less so you get more, and we work to maximize your recovery at every stage of the fault determination process. Insurance companies will try and minimize your pain. We don’t let that happen.
Frequently Asked Questions
Can the insurance adjuster’s fault determination be challenged?
Does the police report automatically determine who is at fault?
How quickly does the insurance company start investigating?
Should I give a recorded statement to the other driver’s insurance company?
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