How Is Fault Determined in a Car Accident?

Reviewed by: Alexander P. Lewis
Last Update: July 2026

After a car accident, it is common for each driver to have a different version of what happened. One person believes the other was speeding. The other insists they had the right of way. So how is fault actually determined?

The answer is usually not found in one conversation or one piece of evidence. Determining fault involves examining the facts, reviewing the available evidence, and applying South Carolina Law to determine what caused the collision. If you have been injured in a car accident, understanding how fault is determined can help you better understand what may affect your claim and why the details surrounding an accident matter. 

What Does Fault Mean?

Fault is the legal responsibility for causing an accident. While people often think of fault as assigning blame, the legal question is whether a driver’s actions or failure to act contributed to the collision.

Sometimes the fault is relatively straightforward. A driver who runs a stop sign or rear-ends another vehicle may be responsible for the crash. Other accidents are more complicated. Traffic conditions, weather, visibility, road design, and the actions of everyone involved can influence how responsibility is evaluated. 

That is why fault is determined by evidence rather than assumptions.

What Evidence is Used to Determine Fault?

No single piece of evidence usually tells the entire story. Instead, investigators look at everything available to better understand how the accident occurred. 

This often includes police reports, photographs of the vehicles and accident scene, witness statements, medical records, traffic camera footage, and in some cases, electronic data from the vehicles involved. If questions remain, accident reconstruction experts may also be asked to evaluate the evidence and explain how the collision likely happened. 

Each piece of information helps answer a different question. Together, they provide a clearer understanding of what occurred before, during, and after the crash.

Does the Police Report Decide Fault?

Many people believe the police report is the final word on who caused an accident. In reality, it is one of several important pieces of evidence.

A responding officer documents observations from the scene, speaks with the drivers and witnesses, records road and weather conditions, and may note whether any traffic laws appear to have been violated. Insurance companies often count on this information during their investigation, and attorneys review it carefully as well. 

However, the report does not automatically determine legal fault. Additional evidence may become available after the accident, and that information can influence how responsibility is ultimately evaluated.

Can Both Drivers Be At Fault?

Yes. Not every accident is caused by one driver’s actions alone.

South Carolina follows a modified comparative negligence rule, which allows more than one person to share responsibility for a collision. If an injured driver is found partially at fault, any compensation they recover is generally reduced by their percentage of responsibility.

For example, one driver may have been speeding while the other failed to yield the right of way. If both actions contributed to the accident, fault may be divided between them.

Under South Carolina law, however, a person who is found to be more than fifty percent responsible for causing the accident generally cannot recover damages from the other party. That is one reason a thorough investigation is so important, especially when liability is disputed.

What If You Disagree With the Insurance Company’s Decision?

It is not unusual for drivers to disagree with an insurance company’s decision about fault.

Insurance adjusters evaluate claims using the information available to them, but that information is not always complete. Additional photographs, witness statements, surveillance footage, or expert analysis may provide a more complete picture of how the accident occurred.

Attorneys often conduct their own investigation for this reason. Reviewing all available evidence helps ensure that important details are not overlooked before decisions about liability or settlement are made.

Why Fault Matters in a Car Accident Lawsuit

Fault affects nearly every part of a car accident lawsuit. It influences who may be legally responsible, how insurance companies evaluate a claim, and whether compensation may be available.

When fault is clear, claims often move more efficiently. When responsibility is disputed, additional investigation may be needed before meaningful settlement discussions can take place. In either situation, understanding how fault is determined provides valuable context for the legal process and helps explain why some cases take longer to resolve than others.

Final Thoughts

Determining fault after a car accident involves much more than deciding whose story is correct. It requires a careful review of the evidence, the circumstances surrounding the collision, and the laws that apply in South Carolina.

If you have questions about how fault may affect your car accident lawsuit, speaking with an experienced personal injury lawyer can help you better understand your options. Every accident presents its own set of facts, and a careful evaluation is often the first step toward understanding what comes next.