A serious truck crash happens. Within hours, sometimes before the injured person has even been treated at the hospital, a trucking company investigator is already standing at the scene.
That is not a coincidence. It is not the carrier checking in out of concern.
Large carriers send rapid-response teams to serious crashes as standard operating procedure. We’ve watched it happen the same way, case after case: while the injured person is still in an exam room, someone from the trucking company is already working the scene.
Understanding why matters. It changes how you should think about everything that happens in the days after the crash.
This article provides general legal information. Consult a licensed Illinois attorney for advice specific to your situation.
Carriers Are Required to Investigate Serious Accidents
There’s a legitimate reason carriers investigate. Federal law requires it.
Under 49 CFR 390.15, every motor carrier has to keep an accident register: a log of crashes involving a fatality, an injury serious enough to need treatment away from the scene, or property damage above a set dollar threshold. Carriers have to hold onto these records for three years and hand them over to federal or state officials on request.
That’s a real institutional duty. Trucking companies are required to document what happened and gather the facts.
The team that shows up to do that documenting is usually not one person. It’s an attorney, someone whose job is reconstructing how the crash happened, and a claims investigator working for the carrier’s insurer.
They photograph the scene. They pull the truck’s electronic data. They talk to witnesses. They document the physical evidence, thoroughly and fast.
None of that is improper. It’s competent, professional work.
Here’s where it gets uncomfortable: that same competent work serves the carrier’s legal defense just as much as it serves its regulatory compliance.
The Litigation Interest Behind the Investigation
A rapid-response team is not a neutral referee.
The carrier or its insurer puts the team together, directs it, and receives its findings. Everything that team documents gets written down in a way that supports the carrier’s account of the crash.
Here’s the flip side: evidence nobody on your side asks for in time can simply disappear.
This imbalance shapes truck accident cases more than almost anything else.
The carrier’s team shows up funded, organized, and already briefed on what to do. Meanwhile you’re in a hospital bed, and your family is trying to hold everything together.
By the time a lawyer is retained and starts digging, days or weeks have often gone by. Data gets overwritten. Rain washes away skid marks. Witnesses move on with their lives.
Whatever the carrier wrote down on day one becomes the starting point for the whole case. Sit with that for a second: the side that may be at fault got to write the first draft of what happened, uncontested, while you were still in a hospital gown.
How the Evidence Imbalance Plays Out at the Negotiating Table
The rapid-response team’s work does not stay in a file cabinet. It becomes the foundation for how the insurer values your claim, months before you ever see a settlement offer.
An adjuster working from the carrier’s own scene photos, its own witness statements, and its own early narrative of what happened has every incentive to value the case low. If your side never independently verified the physical evidence, you are negotiating from a version of events written entirely by the other side.
This is not a hypothetical disadvantage. We have seen initial settlement offers built almost entirely on the carrier’s own reconstruction, presented as though it were simply the objective truth of the crash rather than one side’s interpretation of it. Once your own attorney obtains the ELD data, the dashcam footage, and the maintenance records independently, and often finds details the carrier’s summary left out, the valuation conversation changes considerably.
Illinois Spoliation Law and the Duty to Preserve Evidence
Illinois doesn’t treat spoliation, the destruction or loss of evidence relevant to a legal claim, as its own standalone claim. It’s analyzed as a form of negligence, following the Illinois Supreme Court’s decision in Boyd v. Travelers Insurance Co., 166 Ill. 2d 188 (1995): a party who owed a duty to preserve evidence, breached it, and thereby cost the other side the ability to prove their case, can be held responsible.
Beyond that negligence theory, a court also has its own tools. In Shimanovsky v. General Motors Corp., 181 Ill. 2d 112 (1998), the Illinois Supreme Court addressed sanctions for destroying evidence relevant to anticipated litigation, real consequences that can range from evidentiary penalties to dismissal or a default judgment.
The standard the court set is straightforward. The duty to preserve evidence kicks in once a party knows, or reasonably should know, that the evidence matters to litigation that’s coming.
Think about what it means when a carrier sends a rapid-response team to your crash scene within hours.
It’s hard for that carrier to later claim it didn’t see litigation coming. The team’s presence is the proof.
That means the duty to preserve everything relevant, electronic logging device data, ELD records, maintenance logs, driver qualification files, dispatch communications, and dashcam footage, attaches immediately. Not eventually. Immediately.
If any of that gets destroyed, altered, or quietly overwritten after the duty attaches, the carrier is exposed to significant legal consequences in Illinois courts.
What a Preservation Letter Does and Why Timing Matters
A preservation letter is exactly what it sounds like: a formal written demand from your attorney to the trucking company and its insurer.
It spells out precisely what has to be retained and puts everyone on notice that destroying or overwriting it is not an option. It typically points to the carrier’s existing duty under federal regulations, the Illinois spoliation doctrine from Shimanovsky, and the civil claim that’s coming.
It goes out to the carrier, the driver, the insurer, and any third-party maintenance provider that might be holding inspection records.
Here’s why the timing matters so much. Electronic logging device data is often stored on a rolling basis. If the truck stays in service, it can be overwritten within days.
Dashcam footage on a continuous-loop system can be gone in 24 to 72 hours.
A preservation letter creates a clear, dated record that the carrier knew exactly what it had to hold onto. After that letter goes out, it gets much harder for a carrier to explain away a lost hard drive as an innocent accident.
In our experience, understanding truck accident liability starts here. Preserving evidence is often the single most time-sensitive step in the entire case.
Formal Discovery Backs Up the Preservation Letter
A preservation letter puts the carrier on notice before a lawsuit is filed. Once a case is actually in litigation, Illinois Supreme Court Rule 214 gives your attorney the power to formally demand production of documents, and written interrogatories under Rule 213 let you ask pointed questions under oath about what records exist and what happened to them.
Depositions add another layer. A safety director or the rapid-response investigator can be questioned under oath about exactly when the investigation began, what was collected, what was not, and why. Inconsistencies between what a witness says in a deposition and what the carrier’s own file shows are often where a case turns.
If evidence covered by a preservation letter goes missing anyway, Illinois courts have real tools available under the Shimanovsky framework. These range from barring the carrier from introducing certain evidence or arguments at trial, to an adverse-inference instruction telling the jury it may assume the missing evidence would have been unfavorable to the party that lost it, to dismissal of a defense or, in extreme cases, a default judgment. None of that is automatic. It has to be requested and argued, which is exactly why documenting the preservation letter and following up on it matters as much as sending it in the first place.
An illustrative example, not a real case: imagine a rapid-response team arrives at a highway crash within two hours and photographs skid marks that, in their report, support a finding that the passenger car swerved into the truck’s lane. A preservation letter goes out the same week demanding the ELD and dashcam data. Three months later, in discovery, it turns out the truck’s dashcam was still recording on a loop when the letter arrived, but nobody at the carrier pulled the footage off the device before it overwrote itself. Under the Shimanovsky standard, the carrier’s attorneys argue the loss was accidental, not intentional. The court still allows an adverse-inference instruction because the duty to preserve had clearly attached once the preservation letter was received, regardless of intent. The jury is told it may infer the missing footage would not have supported the carrier’s account. The specifics here are illustrative only; outcomes depend on the facts and evidence in each case.
What Evidence Your Attorney Will Seek to Preserve
A preservation letter covers a lot more than the black box.
In a truck accident case, it typically demands the driver’s hours-of-service logs for the 30 days before the crash. The driver’s qualification file: drug and alcohol testing records, medical certificates, training history. Every vehicle inspection and maintenance record required under 49 CFR Part 396. Dispatch communications with the driver from the day of the crash. The carrier’s accident register under 49 CFR 390.15. Dashcam and telematics footage. Even the photos the carrier’s own response team took at the scene.
That breadth is the difference between a case built on real facts and one built on whatever happened to survive.
The carrier’s team is already collecting all of it, for the carrier’s benefit. A preservation letter is what stops that material from being selectively kept or quietly thrown away.
Why the First Draft of the Story Affects Your Comparative Fault Percentage
Illinois follows a modified comparative negligence rule under 735 ILCS 5/2-1116. You can still recover damages as long as your own share of fault does not exceed 50 percent, but whatever percentage gets assigned to you comes straight out of your award.
That is exactly why the carrier’s early narrative matters so much. If the rapid-response team’s report becomes the only detailed account of how the crash happened, and it frames your actions as careless or unexpected, that framing can quietly inflate your assigned share of fault before your own attorney ever gets a chance to counter it with independently gathered evidence.
A ten or fifteen point swing in comparative fault is rarely trivial. On a six-figure claim, it can mean tens of thousands of dollars, and in a close case, it can be the difference between recovering something and recovering nothing at all once your fault crosses the 50 percent line.
What Your Own Attorney’s Investigation Adds
A preservation letter protects evidence. It does not, by itself, analyze it. That is a separate step, and it usually involves people the carrier’s own team does not answer to.
An independent accident reconstructionist can take the same ELD data, the same dashcam footage, and the same physical evidence the carrier collected and run its own analysis, one that is not shaped by an incentive to protect the carrier. Where the carrier’s team measured skid marks to support one narrative, an independent expert measures them to find out what actually happened, which is not always the same thing.
This is also where medical documentation, employment records, and witness interviews conducted by your own team, rather than relayed secondhand through the carrier’s file, round out the picture. None of it replaces the preservation letter. It is what makes the preserved evidence actually useful once you have it.
Why This All Has to Happen Fast
Everything described above only works on a timeline. Illinois generally gives injury victims two years from the date of the crash to file a lawsuit under 735 ILCS 5/13-202, and that deadline shortens to one year under 745 ILCS 10/8-101 if a government-owned vehicle or entity is involved. Those filing deadlines are separate from the evidence-preservation timeline, but the two problems compound each other.
Waiting even a few weeks to send a preservation letter risks losing electronic data that a rolling storage system overwrites automatically. Waiting months to retain an attorney at all risks both the evidence and, eventually, the filing deadline itself. Neither clock pauses because you are still recovering, still dealing with medical appointments, or still hoping the insurer will simply do the right thing on its own.
Frequently Asked Questions
We understand the instinct to wait. You are dealing with pain, appointments, insurance calls, and sometimes lost income all at once, and calling a lawyer can feel like one more thing on a list that is already too long. But the carrier’s investigators do not wait, and every week that passes without a preservation letter is a week their version of events sits unchallenged.
What if I already waited several weeks before contacting anyone?
Send the preservation letter as soon as possible regardless. Some evidence, particularly maintenance and inspection records required to be kept for longer periods under federal regulation, may still be intact even if rolling data like dashcam footage is gone. A partial evidence set is still worth protecting and building a case around.
Will the trucking company tell me on its own if it destroyed relevant evidence?
Almost never voluntarily. Discovery, depositions, and sometimes a forensic review of storage systems are usually what surfaces a gap between what should exist and what the carrier actually produces.
Is it illegal for the trucking company to investigate before I have a lawyer?
No. Investigating promptly is often a regulatory obligation, not a violation. The issue is not that the carrier investigates, it is that their investigation serves their interests, and nothing obligates them to share it with you until formal discovery forces the issue.
What if the rapid-response team already left before I could call anyone?
That is normal, not a lost cause. Evidence like ELD data, maintenance records, and dispatch logs generally still exists after the team leaves, which is exactly what a preservation letter is built to protect, even sent after the fact.
Can I request the carrier’s investigation file directly?
Not informally, in most cases. The carrier’s internal investigation materials are typically only obtainable through formal discovery once a claim or lawsuit is underway, and even then some materials may be withheld as attorney work product, which is its own contested issue in truck litigation.
Does a preservation letter guarantee the evidence survives?
No, but it substantially raises the legal stakes if the carrier fails to preserve what the letter demands. It converts an accidental loss into a documented, provable failure to meet a known duty.
What if my case involves a fatality? Does the timeline change?
The underlying evidence-preservation urgency is the same or greater, since fatal crashes trigger even more federal reporting obligations under 49 CFR 390.15. The Illinois Wrongful Death Act, 740 ILCS 180/2, generally gives two years from the date of death to file, which can differ from the crash date if the victim survived for a period afterward.
Should I post about the crash or my injuries on social media while this is pending?
No. Insurers and carrier attorneys routinely review a claimant’s public social media activity looking for anything that can be used to argue your injuries are less serious than claimed, or that your own account of the crash has shifted. The safest approach is to say nothing publicly until your case is resolved.
Talk to a Chicago Attorney: Free Consultation
If you or a family member has been harmed, the attorneys at Phillips Law Offices are ready to help. Call (312) 346-4262 or contact us online for a free, no-obligation consultation.
Attorney Advertising. This page provides general information about Illinois law and is not legal advice. Reading it does not create an attorney-client relationship. Deadlines and outcomes depend on the specific facts of your case — speak to a licensed Illinois attorney about your situation.
