Truck Accident Lawyer in Phoenix and Across Arizona

Why an 18-Wheeler Case Is Not a Car Accident Case

A loaded tractor-trailer can weigh roughly twenty times what a passenger car weighs. That physical mismatch is why injuries in semi-truck collisions are so often catastrophic, but it is not what makes these cases legally different. What makes them different is that a commercial truck is operated inside a federal regulatory system that an ordinary driver never touches.

Most interstate motor carriers and their drivers are governed by the Federal Motor Carrier Safety Regulations, 49 C.F.R. Parts 390 through 399, enforced by the Federal Motor Carrier Safety Administration (FMCSA). Arizona has adopted much of that framework for intrastate commercial vehicles as well, through Title 28 of the Arizona Revised Statutes and the rules administered by the Arizona Department of Public Safety's commercial vehicle enforcement program. The practical result: when a commercial truck crashes, there is a written federal standard for how the driver should have been qualified, how many hours he should have been behind the wheel, how the vehicle should have been inspected, and what records the carrier was required to keep.

A violation of one of those rules is powerful evidence. It converts a swearing contest about how the crash happened into a documented question about whether a company followed a written safety rule that exists specifically to prevent the crash that happened.

Second structural difference: money. Under 49 C.F.R. § 387.9, interstate carriers hauling general freight must carry minimum public liability coverage well above Arizona's minimum auto liability limits, and carriers hauling hazardous materials must carry substantially more. Higher limits mean the insurer defends harder, earlier, and with more resources — including rapid-response investigators who reach the scene while the vehicles are still there.

Hours-of-Service Rules and Driver Fatigue

The hours-of-service rules at 49 C.F.R. § 395.3 set hard limits on property-carrying commercial drivers. In broad terms, a driver may drive a maximum of eleven hours after ten consecutive hours off duty; may not drive beyond the fourteenth consecutive hour after coming on duty; must take a thirty-minute break after eight cumulative hours of driving time; and may not drive after sixty hours on duty in seven consecutive days or seventy hours in eight consecutive days, depending on the carrier's operating schedule. Limited exceptions exist for adverse driving conditions and short-haul operations.

Since the electronic logging device mandate took effect, most commercial trucks must record duty status automatically under 49 C.F.R. § 395.8 and § 395.22, rather than on paper. ELD data, when it is preserved, shows engine-on time, movement, and duty-status changes with a precision that paper logs never had. It also shows edits — and unexplained edits to a driver's record of duty status are their own form of evidence.

Fatigue is rarely admitted and often provable anyway. Dispatch records, bills of lading, fuel receipts, toll transponder data, weigh-station records, and cell phone data can be laid alongside the log to show whether the timeline the driver reported was physically possible. When a delivery window could only be met by driving past the federal limit, the pressure that produced the violation frequently traces back to the carrier or the broker rather than to the driver alone.

Maintenance, Inspection, and Driver Qualification Records

Part 396 of the federal regulations requires carriers to systematically inspect, repair, and maintain every vehicle under their control, to keep maintenance records for each unit, and to obtain a driver vehicle inspection report at the end of each driving day identifying defects in the brakes, steering, lighting, tires, coupling devices, and other safety-critical systems. A defect reported and not repaired before the next dispatch is a documented decision, not an accident.

Part 391 governs the driver qualification file: the application, the motor vehicle record checks, the road test or equivalent, the medical examiner's certificate, and the annual review of driving record. Part 382 governs controlled-substance and alcohol testing, including pre-employment, random, reasonable-suspicion, and post-accident testing under § 382.303. Part 383 governs commercial driver licensing and disqualifying offenses.

These files answer a question insurers would prefer not to litigate: should this person have been driving this vehicle at all? Arizona law allows claims for negligent hiring, training, retention, supervision, and entrustment against the employer directly, alongside vicarious liability for the driver's conduct within the scope of employment. When the qualification file shows a pattern the carrier reviewed and ignored, the case is no longer only about a moment of inattention on the freeway.

A commercial truck's maintenance history is also the most common source of a second defendant. A brake failure can implicate the repair shop that last serviced the unit; a tire failure can implicate the vendor; a shifting load can implicate the shipper or the loading company.

Multiple Defendants: Driver, Carrier, Broker, Shipper

A single commercial truck crash can involve half a dozen separate businesses, and they are frequently different companies with different insurers:

• The driver, who may be an employee or an owner-operator working under a lease.
• The motor carrier whose operating authority and USDOT number appear on the door, which is generally responsible for the driver's conduct in the scope of the work and for its own hiring, training, and supervision decisions.
• The equipment owner, when the tractor or the trailer is leased from a separate entity.
• The freight broker or logistics company that arranged the load, where the theory is negligent selection or retention of an unsafe carrier.
• The shipper or loading facility, where an improperly loaded, overweight, or unsecured load contributed to the loss of control.
• The maintenance contractor or parts manufacturer, in mechanical-failure cases.

Why this matters in Arizona specifically: A.R.S. § 12-2505 abolished joint and several liability for most claims. Each defendant pays only its own percentage of fault, and a defendant may formally designate a non-party at fault. Under Arizona Rule of Civil Procedure 26(b)(5), that designation generally must be made within 150 days after the defendant files its answer. If a responsible company is never identified and named, the percentage of fault a jury assigns to it can simply evaporate from the recovery.

Identifying every commercial defendant early is therefore not thoroughness for its own sake. It is the difference between a verdict on paper and a verdict that is actually collectible.

Evidence Preservation: ECM Data, Dashcam, and the Spoliation Letter

Almost every modern semi-truck records data. The engine control module — the ECM, commonly called the black box — captures information such as road speed, engine RPM, throttle position, brake application, and hard-braking events in the seconds around a crash. Many fleets also run forward-facing and driver-facing dashcams, GPS and telematics platforms, and messaging systems between dispatch and the cab.

None of it lasts. ECM data can be overwritten as the truck continues to operate. Dashcam footage is typically stored on a rolling loop. Telematics vendors purge on contractual retention schedules. Federal record-retention periods for some documents are measured in months, and once the retention period lapses the carrier can lawfully destroy the record — unless it has been placed on notice to preserve it.

That is the entire purpose of a spoliation or litigation-hold letter, and it is the first thing that should leave a lawyer's office in a commercial truck case. A properly written letter identifies each category — ECM download, ELD and supporting documents, dashcam and in-cab video, GPS and telematics, dispatch and driver messages, bills of lading and weight tickets, driver qualification and drug-test records, maintenance and inspection history, prior similar incidents — and demands that the truck itself not be repaired, sold, or returned to service before an inspection.

While that letter goes out, the carrier's own rapid-response team is often already working. They photograph the scene, download data with their expert present, and take recorded statements. There is no rule requiring them to wait for you, which is why the timeline in a commercial truck case runs in days, not months. Our post on why truck accident cases are different walks through this in plain language, and what to do in the first 24 hours covers the steps that protect a claim immediately after any crash.

Arizona Comparative Fault and the Two-Year Deadline

Arizona applies pure comparative fault under A.R.S. § 12-2505. The finder of fact assigns each party a percentage of responsibility and reduces the injured person's award by that percentage. There is no fifty-percent bar: a plaintiff found sixty percent at fault still recovers forty percent of the assessed damages. Only a plaintiff who intentionally caused the injury is barred outright.

Expect the carrier's defense to be built around that percentage. The standard arguments in commercial truck cases are that the passenger vehicle merged into the truck's blind spot, cut off the tractor and eliminated its stopping distance, changed lanes without signaling, or stopped short. Physical evidence usually answers these arguments better than testimony does — crush profiles, gouge and yaw marks, the ECM's speed-and-brake trace, and the truck's own dashcam footage. Our Arizona comparative fault explainer covers how those percentages get argued.

The deadline is A.R.S. § 12-542: generally two years from the date of injury for a personal injury claim, and two years from the date of death for wrongful death. Two exceptions change that math substantially. If a government entity or employee may share responsibility — an Arizona Department of Transportation vehicle, a municipal truck, a road-design or work-zone defect — A.R.S. § 12-821.01 requires a written notice of claim within 180 days of accrual and A.R.S. § 12-821 requires suit within one year. And A.R.S. § 12-502 tolls the period for a claimant who is a minor or of unsound mind. See our Arizona statute of limitations guide for the full picture.

Where Commercial Truck Crashes Happen in the Phoenix Metro

Metro Phoenix sits on a national freight crossroads, and the crash patterns follow the freight.

• Interstate 10 is the primary east–west freight corridor between Southern California and Texas. The stretches through Buckeye, Goodyear, Avondale, the Broadway Curve, and out toward Casa Grande carry heavy long-haul volume mixed with dense commuter traffic — the combination that produces rear-end and underride collisions when traffic stacks up without warning.
• Interstate 17 climbs out of the valley toward Flagstaff. Grade, braking, and downhill speed management make it a corridor where brake maintenance and driver experience matter, particularly in the descent into north Phoenix.
• Loop 303 was built in part as a freight bypass on the west side and is ringed by distribution centers and warehouses. Truck traffic entering and exiting at interchanges and industrial driveways creates turning and crossing conflicts with local traffic.
• Loop 202 South Mountain Freeway, US 60, State Route 85, and Interstate 8 round out the regional routes, along with the surface-street industrial districts around Sky Harbor, Tolleson, and the southwest valley.

A crash on any of these routes is investigated by whichever agency has jurisdiction — the Arizona Department of Public Safety on the freeways, city police on surface streets — and DPS commercial vehicle officers may perform a post-crash inspection of the truck. That inspection report, when one exists, is often the first documented evidence of an equipment or logbook violation, and it should be obtained before it is superseded. Our review of the most dangerous intersections in Phoenix covers the surface-street side of the same problem.

Related pages worth reading if a commercial vehicle was involved: car accidents, motorcycle accidents, and wrongful death.