It's one of the most common assumptions after a crash with an uninsured driver — and it runs both directions. Uninsured drivers assume the crash will be pinned on them; insured drivers assume the other side's lapsed policy settles the question. Arizona law doesn't work that way.
Fault and insurance are separate questions
Fault in an Arizona injury claim comes down to negligence: who failed to use reasonable care, and how that failure caused the crash. Insurance status isn't part of that analysis. An uninsured driver who was stopped at a red light when they were rear-ended is not at fault for the collision. An insured driver who ran the light is.
Arizona's comparative fault rule applies the same way
Arizona follows pure comparative fault (A.R.S. § 12-2505): responsibility is divided in percentages, and an injured person's recovery is reduced by their own share — whatever that share is. That framework applies identically whether either driver was insured. Being uninsured doesn't add percentage points of fault, and it doesn't take any away.
What being uninsured actually changes
Driving without required coverage carries its own consequences in Arizona — but those are separate from the injury claim. What insurance status genuinely changes is where compensation comes from. If the at-fault driver is uninsured, the practical path usually runs through uninsured motorist coverage on the injured person's own policy, which Arizona insurers must offer under A.R.S. § 20-259.01.
If you were hit while uninsured
An injured person's own lapsed coverage does not erase their right to bring a claim against a driver who caused the crash. The claim is evaluated on fault, the same as any other. It's a situation worth walking through with someone before assuming there's nothing to be done — the assumption is wrong more often than not.
Saguaro Injury Law evaluates crashes involving uninsured drivers — on either side of the equation — in English and Spanish, with free consultations any hour: (602) 217-0000.