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A loaded 18-wheeler can weigh 80,000 pounds. A typical passenger car weighs 4,000. When those two collide on the I-10, the physics of the crash decide the injuries, but federal trucking rules and Arizona law decide who pays. If you’re searching for a semi-truck 18-wheeler accidents Phoenix lawyer, you’re probably already realizing this isn’t a normal car accident claim. It isn’t. This article walks through what makes truck cases different, who can be on the hook besides the driver, how Arizona’s fault rules cut into a recovery, and what you have to do in the first few days to keep the evidence from disappearing.
For broader context on every kind of commercial truck claim we handle, see our common causes of semi-truck crashes in Arizona and New Mexico overview. This page focuses on tractor-trailers: semis, 18-wheelers, and Class 8 rigs running interstate routes through Phoenix.
In federal terms, a semi-truck or 18-wheeler is a commercial motor vehicle (CMV) with a gross vehicle weight rating of 10,001 pounds or more operating in interstate commerce. The Federal Motor Carrier Safety Administration (FMCSA) regulates these vehicles, the drivers, and the companies that dispatch them. When a CMV is involved, federal rules under 49 CFR layer on top of Arizona tort law, and that combination is what drives case value.
Practically speaking, you’re looking at a tractor pulling a 53-foot trailer, often hauling freight cross-country on I-10, I-17, or I-40. The instant that truck causes a wreck in Maricopa County, you’re in a hybrid federal-state case.
Three differences matter:
Size and physics. Injuries are worse. We see traumatic brain injury, spinal cord damage, multiple fractures, internal bleeding, and fatalities at rates you don’t see in two-car fender-benders. Damages numbers run higher because medical bills, future care, and lost earning capacity run higher.
Federal regulation. Truck drivers and motor carriers have to comply with the FMCSA rulebook. Violations create direct evidence of negligence. A driver over Hours of Service limits, a carrier that skipped a maintenance inspection, a logbook that doesn’t match the ELD data, those aren’t just bad facts, they’re regulatory violations a jury can hang fault on.
Multiple defendants. A car wreck usually has one at-fault driver and one insurance company. A truck wreck can have five or six potentially liable parties and a stack of insurance policies. That’s both an opportunity (more sources of recovery) and a complication (more lawyers, more finger-pointing, longer cases).
The I-10 corridor through Phoenix carries enormous freight volume. Two zones stand out in ADOT crash data: the Stack Interchange (I-10/I-17) and the Mini-Stack (I-10/SR-202). Lane changes, sudden merges, and stop-and-go traffic in those interchanges turn small driver errors into multi-vehicle pile-ups. We also see frequent truck crashes on I-17 going north through the Deck Park Tunnel, the Loop 101 east valley stretch, and US-60 through Mesa.
The causes are predictable:
Truck driver fatigue and Hours of Service violations sit behind a large share of the serious crashes we see. They’re worth understanding in detail because they tie directly to the federal rules below.
Under FMCSA Hours of Service rules, a property-carrying driver may drive a maximum of 11 hours after 10 consecutive hours off duty, and cannot drive beyond the 14th consecutive hour after coming on duty. There are weekly limits too (60 hours in 7 days, or 70 in 8 days for carriers operating every day of the week).
When a driver exceeds these limits and causes a crash, that’s negligence per se in a lot of courts. When a motor carrier dispatches a driver they knew or should have known was over hours, that opens the door to punitive damages.
Since 2017, most interstate trucks have to run an ELD. The device records driving time, engine hours, vehicle movement, miles driven, location, and duty status. Combined with the truck’s engine control module (ECM) data, it tells you exactly how fast the truck was going, when the driver braked, and whether the driver was even supposed to be behind the wheel at the time of the crash.
ELD and ECM data is the single most valuable evidence in most truck cases. It’s also the evidence most likely to disappear. More on that below.
This is where truck cases break wide open. Potential defendants include:
The cargo loader piece matters more than people realize. We’ve worked cases where the proximate cause was an improperly secured load, not the driver. If a third-party loader stacked the trailer wrong and a 2,000-pound pallet shifted on a curve, the loader is on the hook.
Under Arizona tort law, an employer is vicariously liable for the negligent acts of an employee committed within the scope of employment. This is called respondeat superior. For most on-duty crashes, this doctrine pulls the motor carrier in automatically, you don’t have to prove the company itself did anything wrong, just that the driver was working when they caused the wreck.
There’s a wrinkle with owner-operators and lease arrangements. Carriers sometimes argue the driver was an independent contractor, not an employee. The FMCSA’s “logo liability” rule and federal lease regulations usually defeat that argument when the truck is operating under the carrier’s DOT authority, but it’s a fight that has to be had.
Under 49 CFR § 387.9, motor carriers operating in interstate commerce with vehicles of 10,001 pounds or more must carry a minimum of $750,000 in liability coverage. For trucks hauling hazardous materials, the minimum climbs to $1 million or $5 million depending on the cargo.
That $750,000 is a floor, not a ceiling. Most major carriers buy $1 million primary policies with excess layers stacked on top, sometimes $5 million, $10 million, or higher in umbrella coverage. In a catastrophic injury case, identifying every layer of available coverage is a big part of what gets you to full recovery.
Common policy structure in a serious case:
Arizona follows Arizona’s pure comparative negligence rule under A.R.S. § 12-2505. That means your recovery is reduced in proportion to your own percentage of fault, but you’re not barred from recovery even if you’re more at fault than the defendant. (Some states bar plaintiffs at 50% or 51% fault. Arizona doesn’t.)
Worked example: You’re hit by a fatigued semi-driver on I-10. Total damages are $1,000,000 (medical bills, lost wages, future care, pain and suffering). The jury finds you 20% at fault because you were changing lanes when the truck rear-ended you. Your recovery: $1,000,000 × 80% = $800,000.
Defense attorneys for motor carriers know this rule cold. Expect them to argue you were speeding, looking at your phone, not wearing a seatbelt, or in the truck’s blind spot. Beating those arguments is where the ELD data, dashcam footage, and accident reconstruction earn their keep.
Arizona uses several liability under A.R.S. § 12-2506, not joint and several liability. What that means: each defendant pays only their assigned percentage share of fault. If the driver is 50% at fault, the motor carrier (direct negligence) is 30% at fault, and the maintenance contractor is 20% at fault, each one writes a check for their own share. You can’t collect the driver’s share from the carrier just because the carrier has a bigger insurance policy.
This is a critical strategic point a lot of competitor truck-accident pages skip. It means three things in practice:
This is the part most truck-accident articles get wrong, and it’s the part that decides cases.
ELD data. FMCSA rules only require carriers to retain ELD records for 6 months. Some carriers overwrite older records automatically. You need a spoliation letter out to the motor carrier within days of the crash demanding preservation of ELD data, ECM/black box data, driver qualification file, drug and alcohol test results, dispatch logs, and any dashcam footage.
Driver logs. Paper logs and supporting documents (fuel receipts, toll records, bills of lading) cross-check the ELD. Inconsistencies are gold.
Dashcam and rearward-facing camera footage. Most large fleets run dual-facing cameras. Footage typically auto-deletes after 30 to 90 days unless flagged.
Post-crash drug and alcohol tests. Federal regulations require post-crash testing of CDL drivers in qualifying crashes. The results, the time of collection, and the chain of custody all matter.
Physical evidence. Skid marks fade, debris gets cleared, and the truck itself may be repaired and back on the road in weeks. An accident reconstructionist needs access early.
A preservation letter going out in the first week of a serious case is often the difference between proving the driver was 14 hours into a shift and being told “we no longer have those records.”
Economic damages cover the measurable financial losses: past and future medical bills, lost wages, lost earning capacity, property damage, household services you can’t perform anymore, and out-of-pocket expenses.
Non-economic damages cover pain and suffering, emotional distress, loss of enjoyment of life, scarring, and disfigurement. The Arizona Constitution (Article II § 31 and Article XVIII § 6) prohibits statutory caps on damages in personal injury and wrongful death cases. Arizona is one of a small number of states where the legislature cannot cap what a jury awards for pain and suffering. That matters a lot in catastrophic truck cases.
Punitive damages in Arizona are available when the defendant acted with an “evil mind”, conscious disregard for the rights and safety of others. The standard comes from Linthicum v. Nationwide Life Ins. Co. In trucking cases, punitive damages typically come into play with:
The compensatory damages a truck case will support depend on injury severity, treatment trajectory, the strength of liability proof from ELD and logs, the layers of insurance available, and how thoroughly the economic and non-economic damages are documented. We don’t publish settlement ranges because every case turns on its own facts.
Under A.R.S. § 12-542, you have 2 years from the date of the accident to file a personal injury lawsuit in Arizona. Miss that deadline and the case is gone, no matter how strong the liability evidence is. There are narrow exceptions (minors, incapacity, discovery rule in limited situations), but you should treat the 2-year clock as absolute. The same 2-year limit applies to wrongful death claims under A.R.S. § 12-542(2).
If a government vehicle is involved (state DOT, city of Phoenix, county), you have an additional, much shorter deadline: a 180-day notice of claim under A.R.S. § 12-821.01. Miss that and your claim against the government entity is barred. For full detail, see Arizona’s 2-year statute of limitations.
There’s no honest one-line answer. Value depends on injury severity, future medical needs, lost earning capacity, liability proof from ELD and driver logs, how many defendants and policies are in play, and whether punitive damages are on the table. A case with a TBI, a fatigued driver, and falsified logs looks nothing like a low-speed rear-end with whiplash. We give a realistic case-value range in a free consultation after we see the police report and medical records.
Usually both. Under respondeat superior, the motor carrier is on the hook for an employee-driver’s on-the-job negligence. The carrier’s insurance policy (minimum $750,000 federal under 49 CFR § 387.9, often $1M or more in practice) is typically where the money comes from. Arizona’s several liability rule under A.R.S. § 12-2506 then splits the fault percentage across every responsible party.
You can still recover. Arizona is a pure comparative negligence state under A.R.S. § 12-2505. Your damages get reduced by your percentage of fault, but you aren’t barred from recovery even at 60% or 70% fault. The defense will try to push your share as high as possible, which is why fighting the apportionment is a major piece of the case.
2 years from the date of the crash under A.R.S. § 12-542. If a government vehicle is involved, you have only 180 days to file a notice of claim with the entity (A.R.S. § 12-821.01) on top of the 2-year lawsuit deadline.
Possible, but the standard is high. Arizona requires proof of an “evil mind”, conscious disregard for others’ safety. That comes up most often in DUI crashes, falsified logbooks, knowingly dispatching a fatigued driver, or knowingly running a truck with serious mechanical defects. When the facts support it, punitive damages can substantially increase a recovery.
Most are. Trucks running through Phoenix on I-10 are often dispatched from Texas, California, or the Midwest. Arizona courts have personal jurisdiction over any motor carrier that operates on Arizona roads. We’ve handled cases against carriers from across the country and abroad. The case still gets filed in Maricopa County (or the appropriate Arizona venue), and the carrier has to defend it here.
If a semi-truck or 18-wheeler hit you or someone in your family on a Phoenix freeway, the clock is already running on evidence preservation and on the 2-year filing deadline. We serve clients across the Phoenix metro service areas, from downtown to the East and West Valley.
Talk to us before you talk to the trucking company’s insurer: (602) 345-1818. Free case review. No attorney’s fees unless we recover; case costs are governed by the written fee agreement. We answer 24/7.
By Jared J. Pehrson | Impact Legal Car Accident Attorneys
These related guides cover the main truck-accident issues that often overlap in Phoenix commercial vehicle cases.
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