How Is Fault Percentage Calculated

Determining fault in an auto accident isn’t always straightforward. While the driver who violated a traffic law is often considered at fault, California’s ‘pure’ comparative fault rule allows for a division of responsibility. This means even if the other driver was mostly to blame, your recovery can be reduced by your percentage of negligence. But how exactly is that percentage calculated?
The process relies heavily on evidence. Police reports, witness statements, traffic camera footage, and the physical evidence at the scene are all considered. Insurance adjusters (and ultimately, a jury if the case goes to trial) will evaluate each driver’s actions and determine what percentage of the accident was attributable to each party. For example, if Dale had been speeding, even slightly, the insurance company might argue that contributed to the severity of his injuries and therefore reduces their liability.
I’ve been practicing personal injury law in San Diego for over 13 years, and I’ve seen firsthand how insurance companies attempt to minimize their payouts by inflating a plaintiff’s percentage of fault. They often look for any detail, however minor, to shift blame. Being trained by a former insurance defense attorney gave me intimate knowledge of how they evaluate, devalue, and deny claims, and I leverage that understanding to fight for the maximum recovery for my clients.
What Evidence is Used to Determine Fault in a California Car Accident?
A multitude of evidence types are utilized to establish the sequence of events and assign fault. The most common include official police reports documenting the officer’s initial findings and any citations issued. However, these reports are not conclusive and can be biased or incomplete. Independent witness statements are valuable, particularly if they corroborate your version of events. Photos and videos from dashcams, smartphones, or surveillance cameras can provide an objective record of the accident.
Furthermore, the physical evidence at the scene, such as skid marks, vehicle damage, and road conditions, plays a significant role. Accident reconstruction experts may be called in to analyze the data and provide a professional opinion on how the accident occurred. Finally, vehicle “black box” data, if available, can provide detailed information about speed, braking, and other critical factors leading up to the collision.
Successfully gathering and presenting this evidence is crucial for demonstrating the other driver’s negligence and minimizing any claims of contributory fault. This is where having experienced legal counsel is essential.
Can I Still Recover Damages if I Was Partially at Fault?
Yes, absolutely. California follows a “pure” comparative fault system, meaning you can recover damages even if you bear some degree of responsibility for the accident. However, your recovery will be reduced proportionally to your fault percentage. This is governed by Civ. Code § 1714. For example, if you are found to be 30% at fault for an accident and your total damages are $100,000, you would only be able to recover $70,000.
Insurance companies will aggressively pursue any argument to increase your fault percentage, as this directly reduces the amount they have to pay. They may highlight minor infractions or attempt to misinterpret the evidence to portray you as more negligent than you actually were. This is why it’s critical to consult with an attorney who can thoroughly investigate the accident and build a strong defense against these tactics. In San Diego cases, insurance adjusters aggressively use this to devalue claims.
What Role Does a Police Report Play in Determining Fault?
While a police report can provide valuable initial information, it is not the final word on fault. The investigating officer often arrives on the scene shortly after the accident and may not have all the facts. Their conclusions can be based on limited information or preliminary observations. Furthermore, officers are not always experts in accident reconstruction and may make mistakes in their assessment.
The police report should be considered as one piece of evidence among many. It’s important to remember that you have the right to challenge the officer’s findings and present your own evidence to support your version of events. An attorney can help you obtain the full police report, analyze its contents, and identify any discrepancies or inaccuracies.
What Happens if the Insurance Company Claims I Was 100% at Fault?
If an insurance company claims you were 100% at fault, it’s crucial to seek legal counsel immediately. This is a serious accusation that could prevent you from recovering any damages for your injuries. They may be relying on flawed evidence, misinterpreting the law, or simply attempting to intimidate you into accepting a low settlement.
An experienced attorney can thoroughly investigate the accident, gather independent evidence, and challenge the insurance company’s claims. They can also negotiate on your behalf and represent you in court if necessary. Don’t accept a denial of coverage without first consulting with a qualified attorney.
Can Witness Testimony Affect the Fault Percentage?
Absolutely. Witness testimony is often a crucial component in determining fault. A credible witness who observed the accident and can provide an unbiased account of events can significantly strengthen your case. Ideally, witnesses will have a clear view of the accident and can testify about the drivers’ speeds, actions leading up to the collision, and any traffic violations they observed.
However, it’s important to note that witness testimony can be subjective and subject to recall bias. Insurance companies may attempt to discredit witnesses or highlight inconsistencies in their statements. An attorney can help you identify and locate potential witnesses, prepare them for deposition, and effectively present their testimony in court.
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Laws and procedures governing personal injury claims vary by jurisdiction and may change over time.
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Responsible Attorney:
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About the Author & Legal Review Process
This article was prepared by the legal editorial team supporting Richard Peter Morse III,
with the goal of explaining California personal injury law and claims procedures in clear, accurate, and practical terms for injured individuals in San Diego and surrounding communities.
Legal Review:
This content was reviewed and approved by Richard Morse, a California-licensed attorney (Bar No. 289241),
who concentrates his practice on personal injury litigation and insurance claim disputes.
With more than 13 years of experience representing injury victims throughout California,
Mr. Morse focuses on serious personal injury matters including motor vehicle collisions, uninsured and underinsured motorist claims,
premises liability, catastrophic injury, and wrongful death.
His practice emphasizes claims evaluation, insurance carrier accountability, and litigation in California courts when fair resolution cannot be achieved.
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