Truck Accident Investigations

A truck crash case is won or lost on evidence, and most of that evidence is on a clock. Engine data overwrites, dashcam loops recycle, logs get archived, and a damaged rig gets repaired or scrapped. In this Truck Talk segment, Jon Hollan walks through how a serious commercial crash gets investigated, what evidence has to be locked down fast, and why the work in the first days shapes everything that follows. It is part of the firm’s Truck Talk series on commercial vehicle cases.

Evidence Preservation

The single most important step in a truck case is also the earliest one. A commercial crash generates electronic and physical evidence that lives on a deletion schedule, and a carrier under no instruction to keep it will let routine processes erase it. The first document that leaves the office on a serious case is a preservation letter, sometimes called a spoliation letter, that names each category of evidence and demands the carrier hold it.

A preservation demand carries weight. A carrier that receives a clear notice and then lets evidence disappear through routine deletion can face a spoliation finding, where a court treats the missing evidence as if it would have hurt the carrier. That consequence is exactly why the letter goes out immediately and names the engine data, the logs, the video, the dispatch records, and the truck itself, so nothing can be waved off later as an accident of timing.

The letter is specific on purpose. A vague request to “keep everything” gives a carrier room to argue later that it did not understand what was wanted, so the demand lists each category by name and describes the system that holds it. It identifies the engine control module by make and model, the camera platform by its product name, the logging system the driver used, the dispatch and messaging software, the maintenance database, and the physical tractor and trailer by unit number. It also asks the carrier to suspend any automatic deletion routine that would otherwise run on a schedule, because a routine that erases data on day thirty is no defense once the carrier has been told the data matters.

Preservation reaches the company and each person who holds the evidence. A fleet may store its video with a third-party telematics vendor, route its dispatch through a separate platform, and keep its drug-and-alcohol testing records with an outside administrator. Each of those custodians can receive a preservation notice so the data does not vanish from a server the carrier does not directly control. The goal is a clean chain from the day of the crash to the day the evidence is produced, with no gap that a defense lawyer can call innocent.

Engine Data

Every modern commercial truck carries an engine control module that records the seconds around a crash. The module captures speed, throttle position, brake application, and sometimes steering input and engine RPM in the moments before impact. The same event-data-recorder technology the National Highway Traffic Safety Administration describes on passenger vehicles is the spine of a truck reconstruction, because it tells the story the driver may not.

Pulling that data is a technical job with a deadline. The module sits inside the truck, and the data has to be downloaded by a qualified technician with manufacturer-specific software before the truck is repaired, scrapped, or returned to service. A repair can overwrite the relevant memory, and a scrapped truck takes the data to the yard. We schedule the download with a reconstruction expert as early as possible and demand the carrier preserve the truck until it happens, because a driver who claims he braked hard while the module shows no brake application has a credibility problem before the case ever reaches a mediator.

Driver Logs

A truck driver’s hours are recorded automatically. Under the federal hours-of-service framework, most commercial drivers run an electronic logging device that ties to the engine and records on-duty and driving time, which is meant to keep fatigued drivers off the road. The FMCSA electronic logging device rule requires the device and standardizes the data it captures, which makes the log a reliable record of how long a driver had been working when the crash happened.

Logs only tell the truth when they are checked against everything else. The investigation obtains the prior days of electronic logs, then compare them against fuel receipts, toll records, dispatch messages, and delivery timestamps. A log that says a driver was resting while a fuel receipt puts the truck three states away is a falsified log, and a falsified log is powerful evidence that the carrier was running its drivers past the federal limits. The cross-check is where a clean-looking log file starts to come apart.

The device captures more than a daily tally. It records duty-status changes with timestamps, the engine power-on and power-off events, the miles driven, and the location at each change of status. Read alongside the engine data, that record can show how many hours the driver had been behind the wheel without a meaningful break and whether a required rest period was real or logged on paper while the truck kept moving. A carrier that edited or annotated the log leaves a trail too, because the system keeps the original entry next to the edit. Those edits are a place where a careful reading separates an honest correction from a cover.

On-Board Video

Dashcams have become standard equipment on commercial fleets, and they are some of the most decisive evidence in a truck case. Forward-facing cameras show the road and the moments before impact, and driver-facing cameras show whether the driver was alert, distracted, or asleep. Many fleets also run cameras triggered by hard braking or impact, which capture exactly the event a case turns on.

Video is also the most perishable evidence on the truck. Most camera systems overwrite on a cycle measured in days to a few weeks, so footage that exists the day of the crash can be gone before a slow investigation gets started. The first preservation letter identifies the camera system by name, demands every angle, and asks for a forensic-quality copy with the metadata intact. We move on the video first precisely because it disappears first.

Carrier Records

The investigation reaches past the crash into the carrier’s own records. The driver qualification file required under the federal rules holds the license, the medical certificate, the training records, and the carrier’s annual review of the driver’s motor vehicle record. A gap in that file, a missing training certificate, a lapsed medical card, a record the carrier never reviewed, turns a single-driver crash into a case about the company’s hiring and supervision.

The carrier’s public safety record frames the demand. The Federal Motor Carrier Safety Administration publishes every interstate carrier’s crash history, inspection results, and out-of-service rate through its SAFER system. We pull that snapshot early, read it against the file we obtain in discovery, and use a carrier’s pattern of violations to show that the crash was the predictable result of how the company ran its operation.

Hiring and supervision sit at the center of that inquiry. A carrier is the entity that put this driver in this truck, and the file shows how careful that decision was. We look at whether the carrier checked the driver’s prior employment, whether it caught a history of crashes or violations before it handed over the keys, and whether it kept up the annual review the rules require. A company that skipped those steps, or that kept a driver on the road after warning signs, owns more than the moment of impact. The carrier file turns a question about one driver on one day into a question about how the company chose and watched the people it sends onto the interstate.

Maintenance Records

A truck is only as safe as the company keeps it, and the maintenance file shows whether the company kept it at all. Federal rules under 49 CFR Part 396 require systematic inspection, repair, and maintenance of every commercial vehicle, along with records that document the work. We obtain the inspection reports, the repair orders, the driver vehicle inspection reports, and the most recent annual inspection, then read them for the gaps that matter: a brake out of adjustment, a tire worn past its limit, a defect a driver flagged that the shop never fixed.

Those records connect a mechanical failure to a decision rather than bad luck. When a crash involves a brake problem or a tire failure, the maintenance history shows whether the carrier knew about the condition and chose to keep the truck earning miles. A driver inspection report that names a defect, followed by a dispatch that put the truck back on the road before any repair, is the kind of paper trail that moves a case from the driver to the company. The records also confirm whether the post-crash inspection by the police matches what the carrier’s own files admit about the truck’s condition.

Crash Reconstruction

The physical scene tells its own story to someone trained to read it. Skid marks, gouges, debris fields, and final resting positions let a reconstruction expert calculate speeds and angles and reconstruct how the crash unfolded. Combined with the engine data and the video, the physical evidence produces a single time-synchronized account that an insurance defense expert cannot easily contradict.

Reconstruction has to start before the scene disappears. Roads get cleared, debris gets swept, and the trucks get towed within hours, so the documentation of the physical evidence often comes from the police investigation and from an attorney dispatched quickly. The Kentucky State Police investigators who work a serious commercial scene are trained at the Kentucky Transportation Cabinet level, and their report is the starting point the firm’s own expert builds on, not the finish line.

The police crash report carries real weight, and it also has limits. It records the officer’s diagram, the measurements taken at the scene, the statements gathered in the first hour, and the officer’s read on how the crash happened. That document is a foundation, but it was written under time pressure by someone who saw the aftermath and not the event. A reconstruction expert tests the report against the engine data and the video, confirms what holds, and corrects what the physical evidence does not support. The report opens the investigation; it does not close it.

Scene Photographs

Photographs freeze a scene that will not exist tomorrow. A thorough set captures the resting positions of both vehicles, the full run of skid and yaw marks, the gouges in the pavement, the debris field, the damage to each vehicle from every angle, and the sight lines a driver would have had approaching the point of impact. The same images later document the crush pattern on the vehicles, which a reconstruction expert reads to estimate the forces involved. A scene that is photographed well in the first hours preserves measurements that no later visit can recover.

The vehicles themselves are evidence and get documented before they are repaired or released. Photographs and measurements of the tractor and trailer record the crush depth, the points of contact, and the condition of the tires, brakes, and lights at the time of the crash. That is one more reason the preservation letter demands the truck be held: a rig sent back into service or to a salvage yard takes with it the physical proof of how hard the impact was and whether the equipment was sound before it.

Witness Statements

People who saw the crash fade quickly as evidence. Bystanders give a name to a responding officer and then scatter, memories shift within days, and a witness who was certain at the scene grows vague by the time anyone follows up. The investigation identifies those witnesses early, from the police report, from the dispatch and tow records, and from canvassing the area, then takes a clear statement while the memory is fresh. A neutral witness who watched the truck drift across a lane or run a light is the kind of account that an engine download and a video can corroborate.

Statements also surface evidence that nobody had catalogued. A witness may mention a second camera on a nearby building, a vehicle that pulled over to stop, or a detail about the truck’s movement that points the reconstruction in a direction the physical scene alone would not. Each account is recorded carefully and checked against the rest of the file, because a statement that lines up with the engine data and the dashcam is far harder to wave away than any single piece of evidence standing alone.

Expert Team

A serious truck case is a team investigation. A reconstruction engineer downloads and interprets the engine data and maps the physical scene. A former motor carrier safety auditor reviews the carrier’s compliance file the way the federal government would in a post-crash audit. On crashes with brain, spinal, or amputation injuries, a biomechanical engineer connects the recorded forces to the specific injuries the client carries, which is a stronger answer than a treating doctor alone can give about why a person ended up this hurt.

That bench is built before the call comes in, not assembled after. The same investigation framework drives every commercial case the firm handles through its commercial vehicle and trucking practice, against the national carriers running Kentucky’s interstates. The experts work from the same preserved evidence, which is why locking that evidence down in the first days matters so much to everything that comes after.

Commercial Truck Litigation Counsel

Handling catastrophic commercial truck collisions requires thorough knowledge of the Federal Motor Carrier Safety Regulations, digital evidence preservation requirements, and corporate motor carrier discovery practices. Jon Hollan and Sam Aguiar maintain selection in the Trucking Trial Lawyers Association Top 10, directing complex commercial vehicle investigations against national transportation carriers.

Under the Bigger Share Guarantee®, our clients always walk away with more money than the firm after medical bills, liens, and case expenses are paid. If a client’s share would ever be less than the legal fee, the firm cuts its fee. Every case receives a dedicated three-person team: a top-rated attorney, an experienced case manager, and a skilled legal assistant. We work under a flat contingency fee that never increases if your case goes to trial, with $0 out-of-pocket expenses forever.

Insurance companies push settlement releases quickly after a commercial wreck because an injury release is permanent. Once signed, the insurance claim is closed forever, leaving injured people to pay future medical expenses out of pocket. For a free case review, contact Sam Aguiar Injury Lawyers in Louisville at (502) 888-8888 or in Lexington at (859) 888-8000. Get more. Get it faster. Get it with Sam Aguiar.