The Evidence in a Truck Crash Disappears Before You Hire a Lawyer

Almost everyone injured by a commercial truck is told they have two years to bring a claim. That is true and it is misleading, because none of the proof lasts two years.

What exists immediately after the crash

• The engine control module — the black box — recording speed, throttle, braking and fault codes in the seconds before impact.
• Electronic logging device data showing the driver’s hours.
• Forward-facing and driver-facing dashcam footage.
• The driver qualification file, the maintenance file, and dispatch records.
• The truck and trailer themselves, and the load.

How long each of those actually lasts

Hours-of-service supporting documents must be retained for six months under 49 C.F.R. 395.8(k). After that a carrier may lawfully destroy them.

Dashcam systems typically cycle in days unless an event flag preserves a clip — and what counts as an event is set by the carrier.

Engine control module data can be overwritten by continued operation, or lost entirely when the tractor is repaired, the module is replaced, or the unit is sold. A truck that goes back into service the following week may take the recording with it.

The trailer gets reloaded and moves on. The load is delivered. The physical scene is cleared within hours.

Meanwhile, the carrier is already working

Most large carriers operate a rapid response protocol. An investigator, sometimes an accident reconstructionist, is dispatched to the scene within hours — photographing, measuring, downloading the module and interviewing witnesses while the injured person is still in the hospital.

That is not sinister. It is competent. But it means that by the time someone is discharged and starts thinking about a lawyer, one side has had a professional on the ground for a week and the other has not.

The spoliation letter

A written demand that the carrier preserve specific categories of evidence — the module data, the logs, the dashcam, the maintenance and qualification files, the vehicle itself — puts it on notice that destroying them has consequences.

Sent in the first days, it holds material that is otherwise gone. Sent in month four, it frequently arrives after the retention period has lawfully expired, and there is no remedy for evidence destroyed in the ordinary course before anyone asked for it.

What that means practically

If a commercial vehicle was involved, the sensible order is treatment first and a lawyer second — but second, not eventually. Not because a claim needs to be filed quickly, but because a letter does.

1. Get the carrier’s name and USDOT number from the tractor door or the crash report.
2. Photograph the tractor, trailer, load and scene if you are able, and get witness names.
3. Do not give the carrier’s insurer or its investigator a recorded statement.
4. Get preservation under way in the first two weeks.