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A semi-truck crash is not a big car crash. The law treats it differently, the insurance treats it differently, and the evidence disappears on a different clock. If you’re searching for an Arizona truck accident lawyer, you’re already sensing that. This page lays out what actually changes in a commercial truck case: the federal regulations that apply on top of state law, who can be sued besides the driver, how Arizona apportions fault when there are three or four defendants, and the evidence preservation window that most people miss.
Truck cases are still personal injury cases, and many of the principles that apply to car accident claims in Arizona carry over. But the moving parts double. Read this before you sign anything, give a recorded statement, or pick a firm.
Three things change the moment a commercial truck is involved.
Federal law applies on top of Arizona law. Passenger-car crashes are governed almost entirely by Arizona statutes and Arizona traffic regulations. A commercial truck crash brings in the Federal Motor Carrier Safety Administration (FMCSA) regulations under 49 CFR. Hours of service, driver qualification files, drug and alcohol testing, vehicle inspection logs, electronic logging devices. These are federal rules. Violating them is often the proof of negligence.
There are usually multiple defendants. A car crash typically has one at-fault driver and one insurance policy. A truck crash can involve the driver, the motor carrier (the trucking company), the broker who arranged the load, the shipper who loaded the trailer, a maintenance contractor, and sometimes the truck or parts manufacturer. Each has separate insurance. Each can be assigned a percentage of fault.
The insurance numbers are much bigger. Federal law requires a minimum of $750,000 in liability coverage for most interstate commercial trucks weighing 10,001 pounds or more (49 CFR § 387.9). Many carriers carry $1 million or more. That changes how the case is negotiated and who shows up across the table.
The practical result: a truck case is closer to a commercial litigation matter than a fender-bender claim. It needs to be built that way from day one.
This is where most people lose money. They focus on the driver. The driver is rarely the deepest pocket.
The truck driver. Direct liability for negligent driving: speeding, distraction, fatigue, impaired driving, failure to maintain lane, failure to brake.
The motor carrier (trucking company). Under the doctrine of respondeat superior, an employer is responsible for the negligent acts of an employee committed within the scope of employment. If the driver was on the clock and on a dispatched route, the trucking company is on the hook for the driver’s conduct. The carrier can also have direct liability for negligent hiring, negligent training, negligent supervision, negligent retention, and failure to enforce hours-of-service compliance.
The broker. Freight brokers arrange loads between shippers and motor carriers. If the broker hired a carrier with a known safety problem (poor FMCSA Safety Measurement System scores, expired authority, prior crashes), there can be a negligent selection claim.
The shipper. If the shipper loaded the trailer improperly and that load shift caused or contributed to the crash, the shipper can be liable.
The maintenance contractor. If a third-party shop performed brake work, tire service, or a DOT inspection negligently, and that failure caused the crash, that contractor is in the case.
The truck or parts manufacturer. Product liability claim if a defective component (brakes, tires, steering, coupling device) contributed.
Mapping the defendants correctly is not optional. In Arizona it directly affects how much money is actually collectible (more on that in the fault-apportionment section below).
The FMCSA regulations under 49 CFR are the rulebook commercial drivers and carriers must follow. Three areas matter most in crash cases.
Property-carrying drivers can drive a maximum of 11 hours after 10 consecutive hours off duty, and only within a 14-hour on-duty window. After 60 hours on duty in 7 days (or 70 in 8 days, depending on schedule), the driver must take a 34-hour reset.
These rules exist because driver fatigue is a leading cause of catastrophic truck crashes. When the logs show hours-of-service violations or the FMCSA driving-time limits were ignored, that’s often the case.
Most commercial trucks are required to use an ELD that automatically records driving time, engine status, vehicle motion, location, and miles driven. The ELD data is the truth. Paper logs can be falsified. ELDs are much harder to fake.
The ELD download tells us when the driver was actually driving, when they were on duty not driving, how fast they were going in the minutes before impact, whether they braked, and whether the engine recorded a sudden deceleration event. This is the heart of a modern truck case.
Federal rules require post-accident drug and alcohol testing within strict time windows when the crash involves a fatality, an injury treated away from the scene, or a disabling vehicle damage tow. Failure to test, or a positive test, is significant evidence.
There are dozens more applicable regulations: driver qualification files, vehicle maintenance records, cargo securement standards, medical certifications. Each one is a potential lever.
This is the most expensive mistake people make in truck cases. They wait two months to call a lawyer. By then the evidence is gone.
ELD data. Some systems overwrite older records on a rolling basis. Some carriers purge data after the regulatory retention period. We send a written evidence preservation letter (a spoliation letter) to the motor carrier within days of being retained, demanding that ELD and black box data preservation cover dashcam footage, driver logs, dispatch records, qualification files, maintenance records, and post-accident testing results. If the carrier destroys evidence after receiving that letter, an Arizona court can issue a spoliation sanction.
Dashcam footage. Many commercial trucks have forward-facing and inward-facing cameras. The footage typically loops and overwrites on a short cycle unless an event is flagged. If the carrier doesn’t pull and preserve the file, it’s gone.
Driver logs and dispatch records. Required retention under FMCSA rules is six months for some records. Carriers have been known to lose them.
Drug and alcohol testing records. Required to be preserved, but only if tested in the first place. Confirming testing happened (and getting the actual results) is time-sensitive.
Black box data from the truck’s engine control module. The ECM stores hard-braking events, sudden decelerations, speed in the seconds before impact, throttle position. Pulling the ECM requires getting to the truck before it’s repaired, totaled, or auctioned.
The window for what to do after a semi-truck crash to lock down evidence is days, not weeks.
In a standard two-car Arizona crash, the at-fault driver may carry the state-minimum liability policy. If your damages exceed the policy, you’re often chasing the driver’s personal assets (usually nothing) or your own underinsured motorist coverage.
In a commercial truck case, the federal floor is $750,000 for general freight haulers over 10,001 pounds in interstate commerce (49 CFR § 387.9). Tankers carrying hazardous materials require $1 million or $5 million depending on the substance. Many trucking companies carry primary policies of $1 million with excess layers stacked above that, sometimes reaching $5 million, $10 million, or higher.
That ceiling changes the entire negotiation. Severe injuries (traumatic brain injury, spinal cord injury, multiple fractures, wrongful death) can be valued in seven figures, and unlike a typical car case, there’s often enough coverage available to actually recover the full value of the damages. The defense knows this, which is why trucking insurers send experienced defense counsel and accident reconstructionists to the scene within hours.
You need someone on your side doing the same thing.
This is where Arizona law gets technical and where a lot of money is won or lost.
Comparative negligence (A.R.S. § 12-2505). Arizona reduces damages in proportion to the claimant’s percentage of fault. If you’re found 20% at fault and your damages are $500,000, you recover $400,000. Read more on Arizona’s comparative negligence rule, which also explains the limited exceptions (intentional misconduct, willful disregard) where a claimant’s recovery can be barred.
Several liability rather than joint liability. Arizona, by statute, has largely moved away from the old joint-and-several rule for most negligence cases. Each defendant is generally responsible only for their assigned percentage of fault, not for the shares of co-defendants. (The specific subsection language and the carve-outs, for example acting in concert or agency relationships, are worth verifying against current statute and case law for your specific facts.)
Why that matters in a truck case: imagine a crash where the jury assigns 60% fault to the trucking company, 30% to the broker, and 10% to a maintenance shop. Total damages of $1,000,000. The trucking company pays $600,000. The broker pays $300,000. The shop pays $100,000. If the broker is uninsured or insolvent, the trucking company does not automatically pick up the broker’s share under the general several-liability rule. You collect what each defendant owes, and only that, unless an exception applies.
That’s why mapping the right defendants, with the right insurance, with the right allocation of fault, is the entire ballgame in a multi-defendant truck case. Get it wrong and you leave a third of the recovery on the table.
Arizona recognizes three categories of damages.
Economic damages. Quantifiable financial losses. Past and future medical bills, past and future lost income, loss of earning capacity, property damage, out-of-pocket expenses. These are proved with documents: bills, records, employment data, life care plans, vocational expert reports.
Non-economic damages. Subjective losses that don’t have a receipt. Pain and suffering, emotional distress, loss of enjoyment of life, scarring and disfigurement, loss of consortium for a spouse. Proved through testimony, treatment history, and the visible impact on the injured person’s life.
Punitive damages. Available in Arizona when the defendant’s conduct goes beyond ordinary negligence into something the law has described as an “evil mind” or conscious disregard of a substantial risk. Typical triggers in truck cases: DUI, road rage, intentional falsification of logs, knowingly dispatching an impaired or unqualified driver, gross safety violations. Read more on punitive damages in Arizona.
Catastrophic truck-crash damages can include things you wouldn’t think to list: home modifications for wheelchair access, vehicle modifications, in-home nursing, vocational retraining, future surgeries that haven’t happened yet. Building the damages picture correctly is half the case.
In Arizona, you generally have 2 years from the date of the injury to file a personal injury lawsuit (A.R.S. § 12-542). Wrongful death claims have the same 2-year window from the date of death. Read the deeper breakdown on Arizona’s 2-year filing deadline.
A few wrinkles specific to truck cases:
File late and the case is over no matter how strong the facts. Treat the 2-year deadline as a hard wall, not a target.
If you’re reading this within a week of the crash, here’s the priority list.
Not every personal injury firm handles commercial truck cases. Things to ask in the first call:
Case value depends on the severity of the injuries, the medical treatment record, the strength of the liability evidence, the available insurance coverage across all defendants, and how well the damages are documented. Truck cases tend to involve more serious injuries and more available insurance than typical car cases, which often means higher recoveries, but every case turns on its own facts.
Most commercial drivers are interstate. The crash happened in Arizona, so Arizona law applies to the negligence and damages issues. The trucking company can be served through its registered agent or through long-arm jurisdiction. Out-of-state defendants are routine in trucking litigation.
Both. Under respondeat superior, the trucking company is liable for the driver’s negligence committed in the scope of employment. The carrier can also have direct liability for negligent hiring, training, supervision, and safety enforcement. Suing the carrier is usually where the meaningful insurance coverage is.
Arizona applies comparative negligence, so a claimant’s damages are reduced by their assigned percentage of fault rather than barred outright in most cases. Trucking insurers often try to inflate the injured driver’s share to reduce payout. Solid reconstruction evidence is the answer.
It varies widely. Straightforward cases with clear liability and resolved medical treatment can move faster, while catastrophic injury cases, cases with disputed liability, or cases with multiple defendants and disputed apportionment commonly take much longer and may require filing suit. Rushing a serious case to settle before the full medical picture is known almost always leaves money on the table.
Generally, no. You have no contractual relationship with the other side’s insurer. Your duty to give a statement to your own insurer depends on the cooperation clause of your policy. Either way, talk to a lawyer first.
The trucking company’s investigators were probably on scene within hours of the crash. Their adjuster has likely already called you. Their defense lawyer is already lining up the version of events that protects them.
You don’t have to figure this out alone, and you don’t have to figure it out fast on your own. Free case review with Jared J. Pehrson. We answer 24/7: (602) 345-1818. We serve clients across Phoenix metro communities we serve and throughout Arizona.
No attorney’s fees unless we recover. Case costs and fee terms are spelled out in the written fee agreement before anything is signed.
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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