People assume a truck crash is a car crash with a bigger vehicle. Five things make it a genuinely different case, and four of them start working against you within days.
One: federal rules apply on top of Arizona law
Interstate carriers operate under Federal Motor Carrier Safety Administration regulations. Hours of service limits, driver qualification files, drug and alcohol testing requirements, vehicle inspection and maintenance records all exist because federal law requires them.
Each of those is a potential source of liability that has no equivalent in an ordinary collision. A driver over hours is not just tired, they are in violation.
Two: the evidence expires
Electronic logging device data, engine control module readings, dispatch records and post-trip inspection reports sit on retention schedules measured in weeks and months, not years.
A spoliation letter sent early creates a legal duty to preserve that material. Sent late, it arrives after the retention window has already done its work. This single difference explains why truck cases reward acting quickly far more than car cases do.
Three: the carrier investigates immediately
Large carriers dispatch rapid response teams, sometimes within hours. They photograph the scene, download vehicle data and interview the driver while everything is fresh.
By the time an injured person is out of hospital, one side already has a complete file and the other has a police report. That imbalance is normal and it is worth understanding rather than resenting.
Four: more than one party may be liable
The driver. The motor carrier, which may be vicariously liable for its employee. A separate company that loaded the trailer. A maintenance contractor. A broker that arranged the load. Occasionally a parts manufacturer where a component failed.
Identifying who is in the chain is most of the early work, and it is why truck cases take longer to develop than a two-car collision where both drivers are obvious.
Five: the policy limits are on a different scale
Federal minimums for interstate carriers start at $750,000 and rise depending on cargo, with many carriers holding excess and umbrella layers well above that. Arizona’s minimum auto liability is $25,000 per person.
Higher limits mean the insurer defends harder, because there is materially more at stake. Expect a faster, better-resourced defence from the first week.
The black box is not one device
People say black box as though a truck has one. In practice there are several sources: the engine control module recording speed, brake application and throttle in the seconds before impact; the electronic logging device recording hours and duty status; and increasingly telematics feeding back to the carrier in real time.
Each is retained differently and each requires a different request. That is one more reason the early letter matters, because a general demand to preserve evidence is easier to satisfy narrowly than a specific one.
What stays the same
Two years to file under A.R.S. § 12-542. Pure comparative negligence under A.R.S. § 12-2505, so partial fault reduces rather than bars recovery. And the same practical advice about treatment, gaps and recorded statements applies exactly as it would in any other crash.
If you were hurt in Arizona, talk to us before you talk to the insurance adjuster. The case review is free and there is no obligation. Call (480) 937-2116
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