A collision with a commercial truck is not the same as a car accident. The vehicles are heavier, the injuries are more severe, and the evidence landscape is vastly more complex. A fully loaded tractor-trailer can weigh 80,000 pounds. When that mass collides with a passenger vehicle, the physics are devastating — and so is the legal battle that follows.

What makes truck accident cases fundamentally different is the evidence. Commercial trucks generate enormous amounts of data: electronic logging devices track every hour behind the wheel, engine control modules record speed and braking in the seconds before impact, and federal regulations require carriers to maintain driver qualification files, drug testing records, and maintenance logs. This evidence can prove exactly what happened and why. But it does not last forever. Carriers routinely overwrite, destroy, or lose critical records — sometimes within days of a crash.

If you have been in a truck accident in St. Louis, the steps you take in the first hours and days determine whether that evidence survives. This guide walks you through exactly what to do, drawing on the same foundational principles that apply to all Missouri car accidents while addressing the unique demands of commercial vehicle litigation.

Step 1: At the Scene — Safety and Documentation

Call 911 Immediately

Missouri law requires drivers involved in injury accidents to remain at the scene and report the collision. The responding officer will generate a Missouri Uniform Accident Report under RSMo 43.040, documenting road conditions, the position of vehicles, witness statements, and any citations issued. That report becomes foundational evidence.

For truck accidents specifically, ask the responding officer whether the truck driver was cited for any traffic violations. Commercial vehicle violations — logbook discrepancies, overweight citations, equipment failures — carry additional weight in litigation.

Document the Truck and Its Markings

While you wait for emergency services, use your phone to photograph everything you can. Standard accident documentation applies — vehicle damage, skid marks, traffic signals, your injuries — but truck cases demand more:

The truck's DOT number and MC number displayed on the cab or trailer door. These numbers identify the carrier and its federal operating authority.
The trailer number and any company logos. Trailers are often owned by different entities than the tractor, and identifying every party in the chain matters.
The license plates of both the tractor and the trailer. They may be registered in different states.
Any visible cargo spillage, unsecured loads, or equipment defects such as bald tires, broken lights, or fluid leaks.
The driver's name and CDL number if you can safely obtain it.

This information becomes critical when your attorney sends preservation demands to the correct parties.

Get Witness Contact Information

Witnesses to truck accidents are especially valuable because they can describe the truck's behavior in the minutes before the crash — swerving, excessive speed, failure to signal lane changes. Get names and phone numbers before they leave the scene.

Step 2: The First 24 Hours — Medical Treatment

Seek Emergency Medical Care

Go to an emergency room or urgent care facility within 24 hours, even if you feel functional. Truck accident injuries are frequently more severe than initial symptoms suggest. The force of a collision with a commercial vehicle can cause traumatic brain injuries, spinal cord damage, internal organ trauma, and crush injuries that may not manifest fully for hours or days.

Tell your doctor exactly what happened — that you were struck by a commercial truck — and describe every symptom, no matter how minor it seems. Headaches, dizziness, neck pain, tingling in extremities, difficulty concentrating, and sleep disturbances all warrant documentation. These contemporaneous medical records link your injuries directly to the collision and are extraordinarily difficult for the defense to dispute later.

Follow Every Treatment Recommendation

If your doctor prescribes imaging, physical therapy, specialist referrals, or follow-up appointments, follow through on all of them. Gaps in treatment are the most common tool defense attorneys use to argue that your injuries are exaggerated or unrelated to the accident.

Step 3: The Critical Window — Preserving Truck-Specific Evidence

This is where truck accidents diverge sharply from car accidents. Commercial trucks generate data that is governed by federal retention requirements — and much of that data has short shelf lives.

Electronic Control Module (ECM) and Event Data Recorder (EDR) Data

Modern commercial trucks are equipped with engine control modules — sometimes called "black boxes" — that record data including speed, throttle position, braking, cruise control status, and engine RPM in the seconds before and during a collision. Some systems capture the final 30 seconds of driving data before an event trigger.

This data is critical because it provides an objective, machine-generated record of what the truck was doing at the moment of impact. But it can be overwritten by subsequent driving events. Once the truck goes back on the road, the data may be gone.

Electronic Logging Device (ELD) Records

Federal Motor Carrier Safety Administration regulations require most commercial drivers to use electronic logging devices to record their hours of service. ELD data shows when the driver was on duty, driving, in the sleeper berth, or off duty. Under 49 CFR 395.8, carriers must retain these records for at least six months.

Six months may sound adequate, but litigation timelines are unpredictable, and carriers have been known to claim data loss or system failures. Hours of service violations and driver fatigue are among the most common causes of commercial truck accidents — and ELD data is often the only way to prove them.

Driver Qualification Files

Under 49 CFR 391, carriers must maintain driver qualification files that include the driver's employment history, road test results, medical examiner's certificate, motor vehicle record, and annual review of driving record. These files can reveal whether the carrier hired an unqualified driver, failed to conduct required background checks, or allowed a driver with a disqualifying medical condition to operate a commercial vehicle.

Drug and Alcohol Testing Records

Federal regulations under 49 CFR 382 require post-accident drug and alcohol testing for commercial drivers involved in qualifying crashes. The carrier must conduct these tests within specific timeframes — alcohol testing within 8 hours and drug testing within 32 hours of the accident. If the carrier fails to test, or if the results are positive, this evidence is powerful.

Testing records and chain-of-custody documentation must be preserved. Your attorney's spoliation letter should specifically demand these records.

Dashcam and Surveillance Footage

Many commercial trucks now carry forward-facing dashcams, and some have cab-facing cameras as well. Nearby businesses, traffic cameras, and highway monitoring systems may also have captured the collision. This footage is overwritten on short cycles — sometimes as quickly as 48 to 72 hours.

Step 4: Send a Spoliation Letter

A spoliation letter is a formal demand sent to the trucking company, its insurer, and any other relevant parties requiring them to preserve all evidence related to the accident. Under Federal Rule of Civil Procedure 37(e), parties have an obligation to take reasonable steps to preserve electronically stored information (ESI) that may be relevant to anticipated litigation.

Your attorney should send this letter immediately — ideally within 24 to 48 hours of the crash. The letter should specifically demand preservation of:

ECM/EDR data and download
ELD records for the 30 days preceding the accident
Driver's daily logs and trip reports
Driver qualification file
Post-accident drug and alcohol testing results
Vehicle maintenance and inspection records
Dashcam and surveillance footage
Dispatch communications and load documentation
The driver's cell phone records
GPS and telematics data

If evidence is destroyed after a spoliation letter has been sent, Missouri courts can impose sanctions ranging from adverse inference instructions to default judgment. The Missouri Court of Appeals has recognized that a party's awareness of dangerous conditions — and their failure to act on that knowledge — is relevant to establishing negligence. Boggs v. Lay, 164 S.W.3d 4 (Mo. App. E.D. 2005).

Step 5: Do Not Talk to the Carrier's Insurance Company

The trucking company's insurer will contact you quickly, often within hours. They may present themselves as sympathetic, even helpful. They are not. Their objective is to minimize the carrier's exposure, and they have extensive experience doing it.

Do not give a recorded statement. Do not sign medical authorizations. Do not accept any settlement offer without legal counsel. The safest response: "I am represented by an attorney. Please direct all communications to my lawyer."

This is even more important in truck cases than car cases because the amounts at stake are larger — and the insurance companies deploy specialized rapid-response teams that arrive at the scene, inspect the truck, interview witnesses, and begin building the carrier's defense before you have even left the hospital.

Step 6: Understand the Missouri Legal Framework

The Statute of Limitations

Missouri imposes a five-year statute of limitations for personal injury claims under RSMo 516.120. While five years provides more runway than many states, truck accident cases require extensive investigation, expert analysis, and often complex multi-party litigation. Starting early is not optional — it is strategic.

Multiple Liable Parties

Truck accidents frequently involve multiple defendants: the driver, the carrier, the truck owner, the trailer owner, the freight broker, the cargo loader, and the vehicle or parts manufacturer. Each party may bear responsibility, and each has its own insurer. Identifying and pursuing all liable parties maximizes your potential recovery.

Federal Regulations as the Standard of Care

FMCSA regulations establish the minimum standard of conduct for commercial carriers and drivers. Violations of these regulations — hours of service breaches, inadequate maintenance, failure to conduct pre-trip inspections, hiring unqualified drivers — constitute strong evidence of negligence. Your attorney will use these federal standards to establish what the carrier should have done and demonstrate how its failures caused your injuries.

When to Contact an Attorney

Immediately. Truck accident cases are time-sensitive in ways that car accident cases simply are not. Every hour that passes is an hour in which ECM data can be overwritten, dashcam footage can be erased, and the carrier's rapid-response team can build its defense unchallenged.

An experienced truck accident attorney can:

Send spoliation letters within 24 hours to preserve critical evidence
Hire accident reconstruction experts to analyze the scene
Obtain and download ECM/EDR data before it is lost
Subpoena ELD records, driver qualification files, and drug testing results
Identify all liable parties in the chain of commerce
Handle all communications with the carrier's insurance team
Evaluate the full value of your claim, including future medical needs and lost earning capacity

Most Missouri personal injury attorneys work on contingency — you pay nothing unless you recover. The consultation is free.

FAQ

How quickly can truck accident evidence be destroyed?

ECM "black box" data can be overwritten as soon as the truck returns to service — potentially within hours. Dashcam footage typically cycles every 48 to 72 hours. ELD records must be retained for six months under federal law, but data loss claims are common. A spoliation letter sent within 24 to 48 hours is the most effective way to prevent evidence destruction.

What federal regulations apply to truck accident cases in Missouri?

Several FMCSA regulations are central to truck accident litigation. Hours of service rules (49 CFR 395) limit driving time. Driver qualification standards (49 CFR 391) set minimum hiring requirements. Drug and alcohol testing rules (49 CFR 382) mandate post-accident testing. ELD requirements ensure electronic logging of driving hours. Violations of any of these regulations constitute strong evidence of carrier negligence.

Can I sue the trucking company, not just the driver?

Yes. Under theories of vicarious liability and direct negligence, the trucking company can be held liable for the driver's actions and for its own failures — negligent hiring, inadequate training, failure to maintain vehicles, pressuring drivers to violate hours of service limits. In most cases, the carrier and its insurer are the primary defendants because they carry the commercial insurance policies.

What is a spoliation letter and why does it matter?

A spoliation letter is a formal legal demand requiring the recipient to preserve all evidence related to an incident. Under Federal Rule of Civil Procedure 37(e), parties must take reasonable steps to preserve electronically stored information relevant to anticipated litigation. If a carrier destroys evidence after receiving a spoliation letter, the court can instruct the jury to assume the destroyed evidence was unfavorable to the carrier.

How long do I have to file a truck accident lawsuit in Missouri?

Missouri's statute of limitations for personal injury is five years from the date of the accident under RSMo 516.120. However, the practical deadline is much sooner. Evidence degrades, witnesses relocate, and the complexity of multi-party truck litigation requires early investigation. Contacting an attorney within days of the accident — not months — gives you the strongest possible position.

Related Resources

If you've been injured, you deserve someone who fights for you. Contact OTT Law at (314) 710-2740 for a free consultation.

This article is for informational purposes only and does not constitute legal advice. Every case is different. Contact OTT Law at (314) 710-2740 for a free consultation specific to your situation.

What to Do After a Truck Accident in St. Louis: Preserving Critical Evidence