If you’ve been hurt in a crash at an intersection in Arizona, figuring out who’s at fault isn’t just about blame it affects your medical bills, insurance payout, and whether you can recover compensation. The process isn’t always straightforward, and waiting for someone else to sort it out could cost you.

Who actually decides fault after an intersection collision?

Technically, no single person or office “officially” declares fault at the scene. Police officers write reports that note what happened and may suggest who violated traffic laws, but those reports aren’t legally binding. Insurance companies assign adjusters to review evidence and decide who they believe caused the crash for their own payout purposes. If you disagree with their decision, you can challenge it through the legal process for disputing fault findings.

What factors do investigators look at?

Adjusters and attorneys consider things like:

  • Traffic camera or dashcam footage
  • Witness statements
  • Vehicle damage patterns
  • Skid marks or debris location
  • Whether anyone ran a red light or stop sign
  • Cell phone records (if distracted driving is suspected)

Arizona follows a “pure comparative negligence” rule. That means even if you’re partly at fault say, 30% you can still recover 70% of your damages from the other driver. But if you’re found more than 50% responsible, your compensation drops accordingly.

Common mistakes people make after intersection crashes

Many assume the police report settles everything. It doesn’t. Others delay gathering photos or witness contacts, which weakens their case later. Some admit fault at the scene even casually saying “I’m sorry” which insurers may use against them. And too many wait weeks to see a doctor, making it harder to link injuries directly to the crash.

How right-of-way rules affect fault

At four-way stops, the first vehicle to arrive goes first. If two arrive at the same time, the driver on the right has priority. At traffic lights, running a red or turning without yielding to pedestrians often leads to liability. You can read more about how these rules apply to injury claims in our breakdown of Arizona’s fault rules for personal injury cases.

What if the other driver says it’s your fault?

Their opinion doesn’t control the outcome. Insurers weigh objective evidence not opinions. If you have photos showing you had the green light, or a witness who saw them speed through a yellow, that carries more weight than their version. Don’t let pressure from an insurance adjuster rush you into accepting blame.

When should you talk to a lawyer?

If you suffered serious injuries, missed work, or face mounting medical bills, legal help can make a difference. A lawyer can reconstruct the crash, subpoena traffic light timing logs, or hire an accident reconstruction expert. Even if you’re not sure you want to sue, a consultation helps you understand your options. Many firms offer free initial reviews you don’t have to commit to anything.

Can you dispute the insurance company’s fault decision?

Yes. Start by requesting all documentation they used. Then gather your own evidence medical records, repair estimates, witness contact info. If you still disagree, you can file a formal appeal with the insurer or pursue a claim in court. More details on challenging fault are available in our guide on how fault gets determined after intersection collisions.

For official state guidelines on motor vehicle laws, you can also check the Arizona Department of Transportation.

Next steps if you’ve been injured:

  • Get medical care immediately even if you feel fine
  • Take photos of the scene, vehicle positions, and any visible injuries
  • Don’t sign anything from an insurance company without reviewing it carefully
  • Keep a simple journal: pain levels, missed activities, conversations with adjusters
  • Call a local attorney who handles car crash cases they know how local courts and insurers operate