How To Tell Who Is At-Fault in a Car Accident

October 13, 2025 | By The Ye Law Firm Injury Lawyers
How To Tell Who Is At-Fault in a Car Accident

Determining who is at fault in a car accident comes down to showing that one party acted negligently, meaning they failed to drive with reasonable care and caused the crash. This isn't always straightforward and involves a careful review of Washington traffic laws, physical evidence from the scene, police reports, and witness statements to piece together the moments that led to the collision.

The process of figuring out liability can be complex, but knowing the key factors involved can offer some clarity.

Key Takeaways for How to Tell Who is At-Fault in a Car Accident

  • Establishing fault in a car accident relies on the legal principle of negligence, which involves proving one driver failed in their duty to operate their vehicle safely.
  • Key evidence, including official police reports, photographs of the scene and vehicles, and statements from independent witnesses, plays a vital role in an accident investigation.
  • Washington State follows a "pure comparative fault" rule, which means an injured person can still recover compensation even if they are found to be partially responsible for the accident.
  • The specifics of the collision, such as rear-end impacts or left-turn crashes, often point to which driver is presumed to be at fault based on established traffic laws.
  • A personal injury attorney assists by conducting an independent investigation, gathering crucial evidence, and building a case to demonstrate the other driver's liability.

Understanding Negligence: The Key to Determining Fault

When you hear lawyers or insurance adjusters talk about "fault," what they are really talking about is negligence. In plain English, negligence is the failure to use the same level of care that a reasonably careful person would use in a similar situation to avoid harming others. For drivers in Seattle and Tacoma, this means following traffic laws and paying attention to the road.

Two cars involved in a head-on collision in Washington state with drivers calling for help after an accident with an out-of-state driver."

To successfully show another driver was negligent and therefore at fault for your accident, four things generally need to be established:

  • Duty: Every driver has a legal duty to others on the road. This includes a responsibility to obey traffic signals, drive at a safe speed, and remain alert.
  • Breach: The driver breached, or violated, that duty. A breach can be an action, like speeding through a school zone in Federal Way, or an inaction, like failing to turn on headlights in the rain.
  • Causation: The driver's breach of duty directly caused the accident and your injuries. For example, a driver who ran a red light and T-boned your car directly caused the collision.
  • Damages: You suffered actual harm, or damages, as a result of the accident. This includes medical bills, lost wages, vehicle repair costs, and pain and suffering.

When these four elements are present, it creates a strong foundation for holding the at-fault driver accountable for the harm they have caused.

What is Washington’s Comparative Fault Rule?

It’s important to know that in Washington, fault isn’t always a 100/0 split. Our state follows a legal rule called pure comparative fault, which is detailed in the Revised Code of Washington (RCW) 4.22.005.

This rule means you can still recover compensation for your injuries even if you were partially to blame for the accident. The amount of compensation you can receive is simply reduced by your percentage of fault.

For example, if you were found to be 10% at fault for a collision and your total damages were $100,000, you could still recover $90,000. This system recognizes that sometimes multiple factors contribute to a crash, and it allows injured people to seek justice even if they made a small error. 

Because of this rule, insurance companies may try to shift as much blame as possible onto you to reduce the amount they have to pay.

The Crucial Evidence Used to Tell Who Is at Fault in a Car Accident

Because the other driver's insurance company will be looking for any reason to deny your claim or assign you blame, solid evidence is your best tool. The story of what happened is told through the evidence left behind.

Some of the most important pieces of evidence used to determine fault include:

  • The Police Report: While not the final word, the official report created by the responding officer from the Seattle Police Department or Pierce County Sheriff's Department provides a valuable summary. It often includes a diagram of the accident, the officer's initial assessment of fault, any traffic tickets issued, and contact information for witnesses.
  • Photos and Videos: Pictures are powerful. Photos of vehicle damage, skid marks, road debris, traffic signs, and your injuries can help paint a clear picture. Dashcam footage or video from a nearby business, perhaps on a busy street like Martin Luther King Jr. Way in Tacoma, can be incredibly persuasive.
  • Witness Statements: An independent witness who saw the crash can provide an unbiased account of what happened. Their testimony can confirm your version of events and counter any attempts by the other driver to change their story.
  • Vehicle Damage: The location and type of damage on the vehicles involved can tell an expert a lot about the angle of impact, speed, and positioning. A crumpled rear bumper, for instance, is strong evidence of a rear-end collision.

Gathering and preserving this evidence is a critical step in building a strong case and protecting your right to fair compensation.

Common Car Accident Scenarios and How Fault is Often Determined

While every accident is unique, many collisions fall into common patterns. In these situations, traffic laws often create a presumption of fault for one of the drivers.

Who is at Fault in a Rear-End Collision?

In most cases, the driver who hits a car from behind is considered at fault. Every driver has a duty to maintain a safe following distance and be prepared to stop. However, there are rare exceptions where the lead driver could be partially or fully at fault.

These exceptions might include:

  • The lead driver’s brake lights were not working.
  • The lead driver suddenly reversed into the car behind them.
  • The lead driver cut off the other car and immediately slammed on their brakes without a valid reason.

Who is at Fault in a Left-Turn Accident?

A driver making a left-hand turn has a legal duty to yield the right-of-way to all oncoming traffic that is close enough to be a hazard, as stated in RCW 46.61.185. This means that in most intersection accidents involving a left turn, the turning driver is found to be at fault.

However, the oncoming driver could be held liable if they were acting negligently, for example, by speeding significantly over the limit or running a red light.

Who is at Fault at a Four-Way Stop?

The rules for four-way stops can sometimes cause confusion, but they are fairly clear:

  1. The first vehicle to arrive at the intersection has the right-of-way.
  2. If two vehicles arrive at the same time, the driver on the right has the right-of-way.

A driver who fails to follow these rules and causes a crash is typically found to be at fault.

During the wet and sometimes icy winters in the Puget Sound region, you often hear people blame accidents on the weather. Legally, however, the weather is never at fault. Drivers have a responsibility to adjust their driving to the conditions.

Someone who causes an accident by driving too fast on a rainy stretch of I-5 or sliding on a patch of ice on a bridge in Bellevue is negligent for failing to slow down and drive cautiously. According to the Washington State Department of Transportation, drivers should increase their following distance and reduce their speed in poor weather. A driver’s failure to do so is a breach of their duty to drive safely.

What If the Other Driver’s Insurance Company Blames You?

rear end car collision

It is very common for the other driver’s insurance adjuster to call you soon after an accident. They may sound friendly and concerned, but it is important to remember that their job is to protect their company's financial interests. This often means trying to get you to say something that could be used to assign fault to you or minimize your injuries.

You may be pressured to give a recorded statement, but you are not obligated to do so. It is often wise to decline until you have had the opportunity to consult with an attorney. The insurance adjuster’s determination of who is at fault is not the final decision. You have the right to present your own evidence and challenge their conclusion.

How a Personal Injury Attorney Can Help Determine Fault

Figuring out who is at fault can feel like an impossible task when you are also trying to recover from a traumatic injury. An experienced and compassionate car accident lawyer can lift this burden from your shoulders.

A dedicated attorney helps not by just giving advice, but by taking concrete action to build your case. This includes:

  • Conducting a Full Investigation: Your lawyer will act quickly to gather all available evidence, including obtaining the official police report, tracking down witnesses, and finding any available video footage of the crash.
  • Analyzing the Evidence: They will carefully review all the facts to identify the negligent actions that led to your injuries and build a compelling argument for liability.
  • Hiring Professionals: In complex cases, an attorney may work with accident reconstruction professionals who can use physics and engineering principles to scientifically show how the crash occurred and who was at fault.
  • Handling All Communications: Your lawyer will take over all communication with the insurance companies, protecting you from their tactics and ensuring your rights are protected throughout the process.

This support allows you to focus all your energy on what matters most: your physical and emotional recovery.

FAQs: How To Tell Who Is at Fault in a Car Accident

We understand you have many questions right now. Here are answers to a few common concerns people have after a car accident.

What if there were no witnesses to my accident?

Even without independent witnesses, fault can still be determined. The focus will shift more heavily to the physical evidence, such as the location of vehicle damage, skid marks, debris on the road, and data from the vehicle’s event data recorder (the “black box”), which can provide information about speed and braking just before impact.

Does getting a traffic ticket at the scene mean I am automatically at fault?

Not necessarily. A traffic ticket is a piece of evidence that the insurance company and a court will consider, but it is not definitive proof of fault for the civil personal injury claim. You can still challenge the ticket in traffic court, and an attorney can argue that the citation does not accurately reflect what caused the accident.

What happens if both drivers are blaming each other?

This is a very common situation. In these "he said, she said" cases, the outcome will depend on the strength of the available evidence. An attorney will work to find objective evidence—like a witness, video footage, or the physical aftermath of the crash—that can support your account and resolve the dispute.

How does fault work in a multi-car pile-up?

Multi-car accidents can be extremely complex. Fault may lie with a single driver who caused a chain reaction, or it may be shared among several drivers. An investigation will look at the actions of each driver involved to determine their respective percentage of fault under Washington's comparative fault rules.

Contact a Compassionate Car Accident Attorney Today

Chong H. Ye personal injury lawyer

Handling a car accident is incredibly stressful. You should not have to face the fight for fair compensation alone. Chong Hae Ye was inspired to become an attorney after his own parents were injured in a crash and did not receive the caring representation they deserved. He founded The Ye Law Firm Injury Lawyers on the principle that every client should be treated with dignity, respect, and compassion.

If you have been hurt, let us help. We offer legal services in English, Korean, and Spanish and are dedicated to guiding you through this difficult journey with understanding and care. Contact us today at (253) 946-0577 or through our online form for a free, no-obligation consultation to discuss your case and learn how we can help you on your path to recovery.