A commercial truck crash produces more records than any other collision on an Illinois road. The carrier logged the driver’s hours. The engine control module captured speed, throttle, and braking in the seconds before impact. Dispatch traded messages with the cab. A safety file somewhere holds the driver’s training history and prior violations. All of it exists on the day of the crash. Federal rules then let a large share of it disappear, on a schedule far shorter than the deadline to sue.
The sections below cover which records federal regulations require a carrier to keep. They also cover how long each rule protects those records. Illinois law on destroyed evidence closes the discussion.
Hours of Service Records and the Six Month Floor
Federal law caps how long a commercial driver may work. It also requires the carrier to document compliance. The retention rule sits at 49 CFR 395.8(k)(1). A motor carrier must keep records of duty status and supporting documents for each of its drivers. That period runs at least six months from the date the carrier receives them.
Six months marks a floor rather than a ceiling. Many carriers hold logs for a year or longer, because insurers and auditors ask for them. Others clear the file the moment the rule permits. Picture a family that spends eight months on surgeries and rehabilitation. They finally reach a lawyer and learn that the log showing an eleven hour shift no longer exists.
Illinois gives most injury plaintiffs two years to sue under 735 ILCS 5/13-202. Set that deadline beside the six month retention rule. The gap explains why so many trucking cases turn on how quickly someone acted.
What an Electronic Logging Device Stores
Most interstate carriers now record duty status through an electronic logging device. The unit connects to the engine and captures driving time on its own. That design removes a driver’s ability to round a shift down by an hour.
Retention rules do not soften for electronic records. FMCSA applies the identical six month period. The agency also directs the carrier to keep a backup copy on separate hardware, a point it spells out in its ELD guidance for carriers. Notice where the duty sits. It belongs to the motor carrier, not to the software vendor. A subscription lapses or a vendor rewrites its storage terms, and those files vanish while everyone assumes the cloud still holds them.
Engine data sits in a different category. Many tractors carry a control module that logs speed, brake application, and hard braking events. Neither the hours of service rule nor the accident register rule reaches that hardware. Nothing in Part 395 obligates a carrier to preserve what the engine recorded. So a written demand has to name it specifically.
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Supporting Documents Corroborate the Log
A duty log by itself proves very little. Section 395.11 defines the supporting documents a carrier must retain so an investigator can test that log against the paper trail. Five categories make the list: bills of lading and similar origin or destination records, dispatch and trip records, expense receipts covering on duty time other than driving, electronic messages through a fleet management system, and payroll or settlement sheets.
Those records answer questions a log cannot. A fuel receipt stamped in Indiana at 2:40 a.m. contradicts a log placing the driver in a sleeper berth. A settlement sheet paying by the mile explains why a driver skipped a rest break. The same six month clock governs. It starts on the date the carrier receives the document, not the date someone created it.
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The Accident Register Runs Three Years
One record outlasts the rest. Under 49 CFR 390.15(b), a carrier must maintain an accident register for three years after each accident. Entries list the date, the city and state, the driver, the count of injuries and fatalities, and any release of hazardous material.
Its value has little to do with the specific crash. The register captures every accident meeting the federal definition. Many of those never surface in a public database. A pattern of similar incidents across a fleet supports a claim against the company itself, not only against the driver.
Illinois Law and Destroyed Evidence
Illinois handles this question differently than most people expect. The state recognizes no independent tort for spoliation of evidence. In Boyd v. Travelers Insurance Co., the Illinois Supreme Court held something narrower. A plaintiff may state a negligent spoliation claim under ordinary negligence principles.
Under the general rule, nobody carries a duty to preserve evidence. Such a duty arises through an agreement, a contract, a statute, or another special circumstance. A defendant may also assume one voluntarily by affirmative conduct. Boyd found that duty where an insurer took possession of a propane heater to inspect it, then lost it.
Two practical consequences follow for a trucking case. First, a written demand naming specific records helps establish the relationship the court described. Second, a carrier that pulls engine data for its own defense team may take on a duty to keep that data for everyone else.
Why the Demand Letter Goes First
Everything above points one direction. The strongest records sit under the shortest clocks. Nobody at the carrier owes an injured person a warning about that.
An effective preservation letter names what the company must hold. That list starts with duty status records for the days surrounding the crash and the supporting documents behind them. It reaches the electronic log file and its backup, dispatch communications, and the engine control module download. It should also name the driver qualification file, maintenance and inspection paperwork for tractor and trailer, and the accident register. Sending that letter in week one costs almost nothing. Waiting until month eight sometimes costs the case.
Did a commercial truck hit you or someone in your family? Our truck accident team moves on carrier records while the retention clocks still favor you. We handle related car accident claims throughout Chicago and Cook County.
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