Quick Answer: How long does a trucking company keep black box data after a crash?
Some truck recordings can be overwritten within days or weeks, depending on the device and the carrier's settings, so a preservation letter should go out right away. Federal rules require carriers to keep driver hours records for six months.
After a serious truck accident, you may be left wondering what caused the crash and how to prove the driver was at fault. The answers may be stored in electronic records controlled by the trucking company, and some of that evidence can disappear if no one acts quickly to preserve it.
A truck’s black box can reveal how fast the vehicle was traveling and whether the driver applied the brakes before impact. Electronic logging device (ELD) records can also help determine whether the driver violated federal hours-of-service rules.
If you or someone you love was injured in a Florida truck accident, an attorney can take steps to preserve this evidence and investigate what happened while you focus on your recovery.
Key Takeaways About Black Box Data in Florida Truck Accidents
- A truck's engine control module can record speed, braking, and throttle data in the moments before a crash.
- Electronic logging devices automatically record the date, time, location, engine hours, and miles for each driver's shift under 49 CFR 395.26.
- Federal rules require motor carriers to keep drivers' records of duty status for at least six months.
- No federal rule sets how long a heavy truck's engine data or dashcam video must be kept.
- Florida courts can impose sanctions or presumptions against a party that destroys evidence, but they do not allow a separate lawsuit against a defendant for doing so.
What Does a Truck's Black Box Record?
A truck's "black box" usually means its engine control module (ECM), though several other devices also record useful data. Each one captures something different, and together they can reconstruct how a crash happened.
The Engine Control Module and Its Event Data
The ECM manages the engine and can record vehicle speed, brake application, throttle position, and cruise control status. Many modules also save a short snapshot of data when a sudden deceleration or hard braking event occurs.
Heavy truck recorders follow the manufacturer's design rather than one federal format. The federal event data recorder standard in 49 CFR Part 563 applies to vehicles rated at 8,500 pounds or less, so what a particular truck saved depends on its make, model, and settings.
What an Electronic Logging Device Captures
An electronic logging device (ELD) tracks a driver's hours and duty status. Under the federal ELD rule at 49 CFR 395.26, an ELD automatically records these data elements:
- Date and time
- The truck's geographic location
- Engine hours and vehicle miles
- Driver identification data
- Vehicle and motor carrier identification data
The ELD also records each change in the driver's duty status, such as moving from driving to on duty but not driving. Those entries create a timeline that can be compared with the crash time.
Dashcams and Fleet Telematics
Many fleets add forward-facing or driver-facing cameras and telematics systems that report location, speed, and harsh driving events to the company in real time.
Amazon, for example, equips the branded vans its delivery partners drive with telematics, which is one reason Amazon delivery vans can leave a detailed digital trail after a crash. Our Melbourne Amazon truck accident lawyers move quickly to request that data before it’s overwritten or lost.
The table below compares the main data sources in a truck crash case and how long each one tends to last.
| Data source | What it records | Who controls it | How long it lasts |
|---|---|---|---|
| Engine control module (ECM) | Speed, braking, throttle, cruise control, and event snapshots | The truck's owner or motor carrier | No federal retention rule; event data can be overwritten by later events or normal use |
| Electronic logging device (ELD) | Driver hours, duty status, location, engine hours, and miles | The motor carrier and its ELD provider | At least 6 months for records of duty status (49 CFR 395.8(k)) |
| Dashcam video | Road-facing and sometimes driver-facing footage | The motor carrier or camera vendor | Set by the carrier and vendor; many systems record over older footage |
| Fleet telematics | Location, speed, and harsh braking or acceleration alerts | The motor carrier or telematics vendor | Set by the carrier's and vendor's data policies |
| Carrier accident register | A list of reportable crashes, with date, location, driver, and injuries | The motor carrier | 3 years after each crash (49 CFR 390.15) |
The rows with no fixed retention period are the ones most at risk. A carrier that is not asked to preserve that data may lose it in the ordinary course of business.
How Does ELD Data Show Hours-of-Service Violations?
ELD data shows hours-of-service violations by recording exactly when a driver was driving and on duty. Comparing that record to the federal limits can reveal whether a tired driver was pushed past the hours the law allows.
The Federal Hours-of-Service Rules
The Federal Motor Carrier Safety Administration (FMCSA) sets driving limits for property-carrying drivers in 49 CFR 395.3. Under that regulation:
- A driver may drive up to 11 hours after 10 consecutive hours off duty.
- A driver may not drive after the 14th consecutive hour following coming on duty.
- Driving is not permitted after 8 hours of driving time without at least a 30-minute interruption, with some exceptions.
- A driver may not drive after 60 hours on duty in 7 consecutive days, or 70 hours in 8 consecutive days, depending on the carrier's schedule.
Exceptions apply to some short-haul drivers and other operations, so the rule that governs a specific driver has to be checked against the regulation and the carrier's operation.
Checking the Logs Against Other Records
Comparing ELD records with other evidence can reveal whether a driver accurately reported their hours. Fuel receipts, toll records, dispatch messages, delivery confirmations, and GPS data can confirm the log or show that a driver recorded time inaccurately.
Federal rules in 49 CFR 395.8 require carriers to keep supporting documents along with the logs for the same six-month period. Those documents are often where gaps in a driver's account show up.
Why a Violation Matters for Fault
An hours-of-service violation can support a claim that the driver was fatigued and that the carrier allowed or encouraged it. Insurance claims get complicated when evidence of driver fatigue also raises questions about the carrier's responsibility.
Florida's comparative negligence rule, also known as modified comparative fault under section 768.81, means evidence that shifts more of the blame to the trucking side directly affects what an injured person can recover.
How Engine Data Answers Disputed Questions
Engine data can help resolve conflicting accounts of how a crash happened. Speed readings in the seconds before impact can show whether the truck was traveling faster than conditions allowed, and the brake and throttle records can show whether the driver reacted at all. A Melbourne truck accident lawyer can help preserve and interpret this evidence to support your claim.
That matters when the trucking company says the other driver cut in front of the truck or stopped without warning. Data showing that the truck never slowed, or slowed only at the last moment, can point the fault analysis back toward the driver and the carrier.
Why Does Black Box Data Disappear So Quickly?
Black box data disappears because trucks keep working after a crash. A truck that is repaired and returned to service keeps driving, and new events and normal operation can replace the data that mattered.
Overwriting Through Normal Use
Engine modules and cameras have limited storage, and many are designed to record over older information. The longer a truck runs after the crash, the greater the chance that the event snapshot or video from that day is gone.
Retention Rules Cover Only Some Records
Federal regulations set minimum retention periods for logs, supporting documents, and the accident register. They set none for ECM downloads, dashcam footage, or telematics data, so those records depend on company policy unless someone asks the carrier to keep them.
How a Preservation Letter Protects Truck Crash Evidence
A preservation letter, also called a spoliation letter, puts the trucking company on written notice that litigation is likely and that it must keep specific evidence. Sending it early creates a clear record of what the company was asked to save and when.
A thorough preservation letter in a commercial truck case usually asks the carrier to keep:
- The truck and trailer in their post-crash condition, or a chance to inspect them before repairs
- A complete ECM download, made in a way that does not alter the data
- ELD records, records of duty status, and supporting documents for the days before the crash
- Dashcam footage and telematics data from the trip
- Dispatch records, delivery records, and communications with the driver
- Inspection, maintenance, and repair records for the truck
Many claimants find it helpful to have a lawyer send this letter, because the requests need to match the equipment on that specific truck. This is especially important in Amazon and Walmart delivery truck accidents, where sending the letter to every company that may be involved, including any delivery business and the carrier, helps avoid gaps.
What Florida Courts Can Do When Evidence Is Destroyed
Florida courts can sanction a party that destroys evidence, but they do not allow a separate lawsuit for it.
In Martino v. Wal-Mart Stores, Inc. (2005), the Florida Supreme Court held that sanctions, an adverse inference, or a rebuttable presumption of negligence are the remedies when a defendant loses or destroys evidence.
These remedies cannot replace the original evidence, making early preservation especially important. A preservation letter sent early gives the strongest chance of having the actual data in hand.
Black Box Evidence in Delivery and Long-Haul Crashes
The type of truck shapes what data is available. Delivery fleets and long-haul carriers often use different equipment, and the evidence plan has to account for both.
Delivery Fleet Crashes
Delivery vans may fall below the weight thresholds that trigger some federal trucking rules, but they often carry telematics and app-based route records. Those records can show the van's speed, location, and delivery schedule at the time of a crash.
Route data can also show whether a driver was behind schedule, which can be relevant to whether the driver was rushing.
Long-Haul Freight on Florida Interstates
Tractor-trailers on long routes are the trucks most likely to carry ELDs and full ECM data. For I-75 freight corridor crashes, the ELD record of where the driver started and how long the driver had been on duty can be central to the case.
FAQs About Black Box Data in Florida Truck Accidents
Can I get the truck's black box data myself?
An injured person usually cannot pull a truck's black box data directly, because it belongs to the truck's owner or motor carrier and is typically obtained through a preservation request, an agreement between the parties, or a court order in a lawsuit. A Melbourne personal injury lawyer can help request and preserve this important evidence.
Downloads should be done by a qualified technician using the right equipment so the data is not changed in the process.
Will the trucking company drug test the driver after a crash?
Federal rules in 49 CFR 382.303 require post-crash alcohol and drug testing when a crash causes a death, and in certain crashes where the driver receives a citation and someone is injured or a vehicle is towed.
If a drug test is not done within 32 hours, the employer must stop trying and keep a record of why.
What if the truck did not have an ELD?
Some trucks and drivers are exempt from the ELD requirement. Under 49 CFR 395.8, exemptions include drivers who keep logs on no more than 8 days in any 30-day period and trucks manufactured before model year 2000.
Those drivers still keep records of duty status, often on paper, and certain short-haul drivers keep time records instead.
Does a Florida crash report include black box data?
A Florida crash report does not include black box data, because it records what the investigating officer observed and learned at the scene, such as the vehicles, drivers, and conditions. Black box and ELD data have to be downloaded and requested separately from the trucking company.
Does my own car have a black box too?
After a car accident, your own car may have a black box too, since many passenger vehicles have an event data recorder.
When a light vehicle is equipped with one, 49 CFR Part 563 sets the data elements it must record, such as speed and braking in the seconds before a crash, and that data can help show what both vehicles were doing.
Protect Important Evidence After a Florida Truck Accident
After a serious truck accident, your health and recovery come first. You should not have to worry about losing important evidence while trying to get better.
No Client Left Behind helps injured people throughout Florida, including Melbourne and Fort Myers. Our attorneys work to preserve black box data, ELD records, and other evidence that may show who caused the crash.
Call (786) 733-9509 to discuss your accident and learn how we can help you seek compensation.
