Most trucking companies keep EDR and telematics “black box” data for 30 to 90 days before it is automatically overwritten. Federal law requires ELD (hours-of-service) records for 6 months, but other crash data has no guaranteed federal preservation timeline for civil claims. Once data is gone, it cannot be recovered. You must act within days — not months — of a crash.
Understanding the 30-to-90-Day Deletion Window
In the world of commercial trucking, data is a massive commodity. Because fleets generate gigabytes of information every day across hundreds of vehicles, trucking companies often have automated systems that “cycle” data. This means that once the storage is full—often within 30 to 90 days—the oldest data is purged to make room for the new.
If you wait until six months after a crash to hire an attorney, the digital proof of the driver’s speed, braking patterns, and hours of service may already be gone forever. This is why we emphasize the importance of immediate data preservation.
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Is There a Federal Requirement to Keep This Data?
While the Federal Motor Carrier Safety Administration (FMCSA) requires trucking companies to keep Electronic Logging Device (ELD) records for six months, this is primarily for hours-of-service compliance. Other “Black Box” data, such as Event Data Recorder (EDR) information (which captures the seconds before an impact), does not always fall under the same strict federal retention timelines for civil litigation.
People Also Ask
Can a trucking company delete black box data after a crash?
Yes — and it happens more often than you might think. Unless a trucking company receives a formal legal notice (called a spoliation letter) demanding preservation, their automated systems may overwrite the data as part of routine fleet management. Courts can penalize companies for destroying evidence, but only if you can prove they received notice first. That is why acting fast matters.
What data does a truck’s black box actually record?
Depending on the system, a commercial truck’s Event Data Recorder (EDR) or telematics unit can capture:
- Vehicle speed in the seconds before impact
- Hard braking events and brake application
- Engine RPM and throttle position
- GPS location and route history
- Hours of service and driver identification
- Seatbelt status
- Stability control activations
This data can directly contradict a driver’s version of events — and trucking companies know it.
Does Virginia law require trucking companies to preserve black box data?
Virginia follows general spoliation doctrine. Once a trucking company has reason to anticipate litigation — including receiving a spoliation letter from your attorney — they have a legal duty to preserve all relevant evidence. Failure to do so can result in sanctions, adverse jury instructions, or even dismissal of defenses. This is why our Charlottesville truck accident lawyer sends that letter immediately.
What happens if the black box data is already gone?
If data has been overwritten before a preservation demand was sent, recovery may be impossible. However, an experienced truck accident attorney can sometimes reconstruct what happened through other sources: driver logs, dispatch records, GPS fleet tracking reports, cell phone records, and witness statements. The absence of data that should have existed can itself become powerful evidence of negligence.
How to Stop the Deletion: The Spoliation Letter
The only way to ensure the trucking company does not “accidentally” delete this information during their routine data purge is to send a formal Spoliation Letter.
A spoliation letter is a legal notice that puts the trucking company on notice that a claim exists and that they have a legal duty to preserve all evidence related to the crash—including telematics, GPS data, and engine control module downloads. You can learn more about how these letters work in our guide, The First 49 Hours After a Truck Accident: Evidence That Disappears if You Don’t Act Fast.
✅ What to Do Right Now If You Were in a Truck Accident
If you or a loved one was hurt in a collision with a commercial truck, here is your immediate checklist:
- Seek medical care first — your health is the priority, and documented injuries matter in your case
- Do not give a recorded statement to the trucking company’s insurer
- Write down everything you remember about the crash while it is fresh
- Save any photos or video from the scene, your vehicle, or dashcams
- Contact a truck accident attorney immediately — ideally within 24 hours
- Ask your attorney to send a spoliation letter demanding black box and telematics data preservation
- Do not sign any releases from the trucking company or their insurance
The trucking company’s team is already working. You need someone on your side doing the same.
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Don’t Let the Evidence Disappear
Because the clock is ticking the moment a crash occurs, you need an attorney who understands the technical side of these systems. If you or a loved one has been involved in a collision with a commercial vehicle, we can help you secure this data before it is lost.
For more information about how Black Box data works in a truck crash case, please visit our article, How We Use Telematics Data to Win Truck Crash Cases.
Contact our Virginia truck accident lawyer today to learn more. Bob Byrne is the first and only attorney in Virginia who is board certified in Truck Accident Law.
Contact MartinWren, P.C. today for a Free Case Evaluation.
Let our Charlottesville personal injury lawyer team work for you to secure your recovery after a truck accident case.
Call (434) 817-3100 or complete a Case Evaluation form