7 Things Your Big Rig Truck Injury Lawyer Must Do to Preserve Your Case

A preservation letter is a formal legal notice that forces the motor carrier to stop destroying evidence. Without it, a trucking company can legally delete critical data days after the crash. You have a narrow window — some states' spoliation laws give carriers only 48 to 72 hours before they can legally delete records. Your lawyer will target specific categories: electronic logging device (ELD) data, hours-of-service (HOS) logs, dispatch records and communications, vehicle maintenance records, driver vehicle inspection reports (DVIRs), post-crash drug screening results, and any video footage from onboard cameras or dashcams. A preservation letter doesn't file a lawsuit — it simply creates a legal duty. If the carrier violates that duty and deletes the data anyway, you can argue spoliation at trial, which strengthens your case significantly. The first attorney-client conversation should result in a preservation letter being sent that same day.

CSA stands for Compliance, Safety, Accountability. The Federal Motor Carrier Safety Administration (FMCSA) publishes CSA scores for every regulated motor carrier in the United States. These scores are public record and available through the [FMCSA database](https://www.fmcsa.dot.gov/). The scores measure carrier performance across seven metrics: unsafe driving, hours-of-service compliance, driver fitness, controlled substance violations, vehicle maintenance, hazmat compliance, and crash history. If the motor carrier's CSA score is above the intervention threshold in unsafe driving or HOS violations, that's direct evidence of company-level negligence — separate from individual driver conduct. Many juries don't understand that a trucking company can be liable even if the driver wasn't violating company policy. CSA scores change that. They show a pattern. If the carrier consistently fails inspections and has repeated HOS violations before this crash, you're proving the company knew about the risk and ignored it. Your lawyer will pull these scores immediately and use them to name the motor carrier as a defendant, not just the driver.

Every commercial driver operating a Class 8 tractor-trailer must maintain a driver qualification file (DQF) with their employer. That file contains the hiring application, references, road test certificate, prior employment history, and DOT medical examination results. It's discoverable in litigation. If the carrier hired a driver without checking references or overlooked a previous accident or failed DOT physical, that's negligent hiring. A driver might fail an eyesight test or have a cardiovascular condition that disqualifies them from operating a CMV, but the carrier hired them anyway. DOT medical certifications expire every two years for most drivers, every year for those with certain conditions. If this driver's medical certificate had expired, the motor carrier was operating an unqualified driver — a federal violation. These records are kept by the carrier, not the driver, so your lawyer demands them directly from the company in discovery. The qualification file can reveal red flags the trucking company ignored before they put this person behind the wheel.

Commercial trucks are subject to federal maintenance standards. The motor carrier is required to keep written records of every repair, inspection, and maintenance performed on each vehicle. These include Driver Vehicle Inspection Reports (DVIRs), which are supposed to be completed daily by the driver, documenting any defects or mechanical problems. Your lawyer will request three years of maintenance records for the specific tractor and trailer involved in the crash. They'll look for patterns: repeated brake failures, steering issues, tire defects, lighting problems, or coupling failures. If the truck had a defective brake system and the carrier didn't repair it, and the crash involved brake failure, that's negligent maintenance. Similarly, if maintenance records show the carrier kept ignoring the same defect across multiple vehicles, that's evidence of company-wide negligence. Defective vehicles claim cases turn on these records. An 18-wheeler brake system failure at highway speed is often fatal because drivers can't control 80,000 pounds of momentum. If the maintenance logs show the carrier knew about brake issues and did nothing, that's negligence that goes beyond the individual driver's actions.

Federal hours-of-service (HOS) regulations limit how long a driver can operate a commercial motor vehicle. The standard rule: 11 hours of driving after 10 consecutive hours off-duty. Drivers are also limited to 14 hours on-duty (including non-driving work) and must take 30-minute breaks if they're approaching that limit. Electronic logging devices (ELDs) track this automatically and are required on all Class 8 tractors since 2017. If the crash occurred in hour 12 of driving, the driver was operating in violation of federal law — a clear negligence indicator. Your lawyer will obtain the ELD data and review it for the 7 days prior to the crash, looking for patterns of violations. A driver who consistently works 14 or 15 hours on consecutive days is fatigued. Fatigue degrades reaction time and decision-making. If the ELD shows the driver was exceeding HOS limits regularly, and the carrier did nothing to stop it, that's evidence of both driver negligence and motor carrier negligence. Some carriers even disable ELDs or fail to monitor the data, which is itself a federal violation. HOS violations are one of the most common findings in truck accident litigation because they're provable with objective data.

The motor carrier is not always the only party liable for a big rig crash. The shipper (the company that sends freight), the freight broker (who arranges the shipment), the loading company, and the trailer owner may all have independent liability. Crash data from [NHTSA](https://www.nhtsa.gov/) shows that equipment failures, improper loading, and maintenance issues contribute significantly to heavy truck accidents. If a shipper loads a trailer improperly — placing weight too high or too far forward — the truck becomes unstable and more likely to roll, especially in turns or emergency maneuvers. If a freight broker pressures a driver to skip mandatory rest breaks to meet a delivery deadline, that's negligence. If a trailer owner fails to maintain the coupling system and it fails, causing the trailer to jackknife, that's liability separate from the driver. Your lawyer will map out the entire supply chain and determine who bears responsibility for each element: load balance, vehicle maintenance, driver scheduling, and equipment condition. Big rig crashes often involve multiple defendants. Spreading liability across multiple parties sometimes increases the total recovery because each defendant's insurance covers their portion.

Most states follow either pure comparative negligence or modified comparative negligence. In a pure comparative negligence state, a plaintiff can recover even if they're 99% at fault — they simply receive 1% of the judgment. In a modified comparative negligence state (typically the 50% bar rule), a plaintiff cannot recover if they're found to be 50% or more at fault. A few states follow contributory negligence, which bars recovery entirely if the plaintiff bears any fault. These rules shape strategy. If you were a passenger in a vehicle struck by a truck, you're likely 0% at fault and recover 100%. If you were a driver in the struck vehicle and the jury finds you 20% at fault for being distracted, you recover 80% in a pure comparative negligence state but only if your state follows the comparative rule and not the bar rule. Your lawyer will assess your state's law early because it affects settlement negotiations. A truck company's insurer calculates reserve differently under pure versus modified comparative negligence. They also consider jury tendencies in your jurisdiction — some juries in trucking-heavy regions may be more sympathetic to carrier defendants. Understanding these rules lets your lawyer set realistic expectations and negotiate accordingly.