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An I-10 crash in Phoenix is not a fender-bender on a side street. You’re dealing with freeway speeds, multiple responding agencies, possible commercial trucks, and evidence that starts disappearing within days. This guide walks through how an I 10 accident claim in Phoenix actually works: who writes the report, what evidence to lock down, and the filing deadlines that quietly kill valid claims. It’s written for someone actively working an insurance claim, not someone browsing legal theory. For a broader view of our practice, see our Phoenix car accident lawyer page.
I-10 runs from California to Florida. Through Maricopa County it carries commuter traffic, long-haul freight between Los Angeles and Texas, ADOT construction crews, and DPS patrols, often all in the same mile of pavement. That combination changes how your claim gets built.
Three things are different from a typical surface-street collision:
Miss a step in any of these and the claim gets harder to prove.
I-10 through Maricopa County crosses multiple city jurisdictions, but the freeway itself is a state route. In practice, the Arizona Department of Public Safety (DPS) is the primary responding agency for crashes on the mainline of I-10. If the crash happens on an on-ramp, off-ramp, or a surface street right after you exit, you may end up with a Phoenix PD, Tempe PD, Chandler PD, Tolleson PD, or Buckeye PD report instead, depending on which city owns that stretch of asphalt.
This matters because:
If you don’t know which agency responded, start with DPS for anything on the mainline. If the crash was on an interchange or exit, call the nearest city PD. Our guide on how to get a car accident report in Phoenix walks through the request process for each agency.
Under A.R.S. § 28-667, the investigating officer must forward a written accident report to the Arizona Department of Transportation within 24 hours when the crash involves injury, death, or estimated property damage of $2,000 or more. Almost every I-10 crash meets one of those thresholds.
Once the report is written, you request it from whichever agency wrote it:
The report will contain the officer’s diagram, statements from drivers and witnesses, citations issued, and the officer’s observations about contributing factors. It’s not the last word on fault, but it’s the starting point every insurance adjuster uses.
Ask for the report by name and case number. If you don’t have the case number, give the date, time, mile marker or nearest exit, and the vehicles involved.
According to ADOT’s annual Arizona Motor Vehicle Crash Facts data, several I-10 interchanges see elevated crash volumes:
A crash at these locations is not automatically the other driver’s fault. But crashes here often involve multiple vehicles, high closing speeds, and complicated liability questions. The specific interchange sometimes matters for evidence, too, because ADOT freeway cameras cover different segments with different retention windows.
I-10 is one of the busiest freight corridors in the country. That means the vehicle that hit you may be a commercial truck subject to federal safety rules, not just Arizona traffic law.
Two things change immediately when a commercial vehicle is involved:
1. The insurance minimums are higher. Under 49 CFR § 387.9, trucks weighing 10,001 lbs or more operating in interstate commerce must carry at least $750,000 in liability coverage. Some carriers carry $1 million or more. That’s often the difference between a claim capped by a state-minimum policy and a claim that can actually cover a serious injury.
2. The truck is recording data about itself. Under 49 CFR § 395.8, most commercial drivers must use electronic logging devices (ELDs) to track hours of service. Most trucks also have engine control modules (ECMs) that log speed, braking, and throttle input, and many now have forward-facing dashcams. That data can help prove the driver was speeding, fatigued, or braked too late, but only if it’s preserved.
The trucking company has no obligation to save that data unless it’s put on notice. A spoliation letter, a formal demand that specific evidence be preserved, should go out within days of a serious I-10 truck crash. Wait too long and ELD data can be overwritten in the normal course of business.
For related background on how these cases develop, see our overview of common causes for semi-truck accidents in Arizona and New Mexico.
Here’s what most people don’t realize: the strongest evidence in a freeway crash is often gone within weeks.
Short-retention evidence commonly relevant to I-10 claims includes:
Getting these locked down in the first week or two is often the difference between a provable claim and a he-said/she-said fight with the adjuster.
This is the deadline most people (and honestly, some attorneys) miss on I-10 cases.
Under A.R.S. § 12-821.01, any claim against an Arizona public entity or public employee must be served on the entity within 180 days after the cause of action accrues. The notice has to demand a specific sum and explain the facts supporting the claim. Miss the 180 days and the claim against that public entity is barred, permanently, even though the underlying two-year statute of limitations has not run.
Why this matters on I-10:
If there’s any chance a public entity is involved, treat the 180-day clock as running from day one of the crash. Do not wait to figure it out.
Arizona is a pure comparative negligence state. Under A.R.S. § 12-2505, damages are reduced by whatever percentage of fault the jury (or adjuster) assigns to the claimant. Even at 99% at fault, a plaintiff can technically still recover 1% of their damages. That’s Arizona’s comparative negligence rule in one sentence.
On I-10, fault fights are common. The adjuster may argue you were speeding, following too closely, changing lanes unsafely, or distracted. Even a 20% fault finding turns a $100,000 case into an $80,000 case. A 40% finding turns it into a $60,000 case.
This is where the evidence work up front pays off. Freeway cameras, ELD data, and reconstruction can flip a disputed fault picture. Without them, the adjuster’s version tends to win by default.
A serious I-10 crash often triggers more than one insurance policy. The layers usually look like this:
Sorting out which policies apply, and in what order they pay, is a large part of what actually happens on a freeway claim.
Two deadlines matter most:
Other timelines don’t bar the claim but can hurt it:
The two-year lawsuit deadline sounds long. It isn’t, once you factor in medical treatment, negotiation, and the time needed to work up commercial-vehicle or public-entity issues.
If the crash happened recently, focus on the next 30 days:
If any of that feels beyond what you can manage while injured, that’s the point where an attorney earns their fee.
DPS handles crashes on the mainline of I-10 through Maricopa County. If the crash happened on an off-ramp, on-ramp, or a surface street immediately after exiting, a city police agency (Phoenix, Tempe, Chandler, Tolleson, or Buckeye, depending on location) may write the report instead. Sometimes both agencies respond and both write reports.
For a personal injury lawsuit, the deadline is 2 years from the date of the crash under A.R.S. § 12-542. If a public entity (ADOT, DPS, a city, or a public employee) may be at fault, a notice of claim must be served within 180 days under A.R.S. § 12-821.01. The 180-day deadline is the one people miss.
Interstate trucks weighing 10,001 lbs or more must carry at least $750,000 in liability coverage under 49 CFR § 387.9, regardless of what state they’re based in. Arizona has jurisdiction over a crash that happens on Arizona roads, so the claim can generally be pursued here.
Send a preservation request to ADOT as soon as possible, ideally within days. Retention windows are short, and there is no automatic archive for specific crashes. Include the date, time, direction of travel, and nearest mile marker or exit.
Hit-and-run crashes are common on freeways. If the driver is never identified, your own uninsured motorist (UM) coverage becomes the primary source of recovery. Arizona insurers are required to offer this coverage under A.R.S. § 20-259.01, though drivers can decline it in writing.
Not entirely. Arizona uses pure comparative negligence under A.R.S. § 12-2505, which means recovery is reduced by the claimant’s percentage of fault but not eliminated. Even substantial fault does not automatically bar the claim.
I-10 claims move fast, and the evidence that wins them moves faster. If you or a family member was hurt in an I-10 crash anywhere in Maricopa County, get a clear read on the situation before the adjusters and the deadlines start shaping it for you.
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By Jared J. Pehrson | Impact Legal Car Accident Attorneys
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