Morris & Dewett has handled Louisiana big truck injury cases for over 25 years.
How Truck Accident Causes Determine Liability in Louisiana
In Louisiana truck accident cases, the cause of the crash determines who is legally responsible. That question is more complicated than in car accidents because liability can attach to the driver, the trucking company, a cargo loader, or a manufacturer, sometimes all at once.
The driver, the trucking company, a third-party cargo loader, a parts manufacturer, or some combination of all four can each carry legal responsibility. Louisiana law allows multiple parties to share fault simultaneously. Each responsible party’s percentage of fault is calculated separately, and each can be held liable for their share of your damages.
FMCSA
Federal Motor Carrier Safety Administration. The federal agency that regulates commercial vehicles, sets safety standards, and enforces trucking rules including hours of service, vehicle inspections, and driver qualifications.
ELD
Electronic Logging Device. A device installed in commercial trucks that automatically records driving time. Required by federal law since 2019. ELD data is key evidence in truck accident cases because it documents hours behind the wheel.
ECM
Engine Control Module. The truck’s onboard computer that records pre-impact speed, braking, throttle position, and other data. Sometimes called the “black box.” Data can be overwritten within 30 days without a preservation demand.
The evidence that connects cause to liability includes FMCSA violation records, ELD data, ECM data, driver qualification files, maintenance logs, and cargo loading documents. This evidence starts disappearing within days of the crash. Securing it requires spoliation letters, preservation demands, an investigator dispatched to the scene, and a black box download in the first 72 hours.
Driver Negligence: The Leading Cause of Truck Accidents
Driver error accounts for approximately 87% of large truck crashes, according to the FMCSA Large Truck Crash Causation Study. That share is where most liability starts.
The FMCSA study breaks driver error into four categories. Decision errors caused approximately 38% of crashes: drivers going too fast for conditions, following too closely, or misjudging gaps in traffic. Recognition errors caused about 28%: inattention, distraction, looking but not seeing. Non-performance errors (falling asleep, incapacitation) caused roughly 12%. Performance errors (overcompensation, poor vehicle control) caused about 9%.
Blind spots are a factor the FMCSA data consistently highlights. Tractor-trailers have four major blind zones. The right-side no-zone extends up to three lanes wide. Crashes involving lane changes, merges, or a car traveling alongside a truck for an extended period often trace back to the driver’s inability to see the smaller vehicle. This is an avoidable situation. Federal regulations and training standards address it. But the carrier must actually train drivers, not just certify them on paper.
ELD data and ECM data can be overwritten, or trucks can be repaired and put back on the road before anyone extracts the pre-crash records. Morris & Dewett sends spoliation preservation demands within 24 hours of engagement. We lock down the data before the carrier’s legal team can manage the evidence trail.
Hours-of-Service Violations and Fatigue
HOS
Hours of Service. Federal rules limiting commercial drivers to 11 driving hours within a 14-hour on-duty window, with a mandatory 30-minute break after 8 hours.
HOS rules set the legal driving limits for commercial truck operators. Under 49 C.F.R. Part 395, drivers are limited to 11 hours of driving within a 14-hour on-duty window, followed by a mandatory 10-hour off-duty period. A 30-minute break is required after 8 cumulative hours on duty.
The ELD mandate, effective since December 2019, requires most commercial carriers to use electronic logging devices that automatically record drive time. Paper log falsification is largely eliminated. But carriers still pressure drivers through scheduling practices: unrealistic delivery windows, bonus structures tied to on-time performance, and informal expectations that drivers absorb delays by shortening rest. The pressure exists even when the logs look clean.
ECM data tells a more complete story than the ELD alone. The engine control module records pre-impact speed, braking application, throttle position, and engine RPM in the seconds before a crash. This data can be overwritten within 30 days under normal carrier operation. Without a formal preservation demand, it disappears.
Distracted and Impaired Driving
CDL
Commercial Driver’s License. A federally required license for operating vehicles over 26,001 lbs GVWR, vehicles carrying hazardous materials, or vehicles transporting 16+ passengers.
Federal regulations at 49 C.F.R. Part 392 prohibit CDL holders from texting or using a handheld mobile phone while driving. A single text message takes a driver’s eyes off the road for approximately five seconds. At 65 mph, that is the length of a football field.
Over-the-counter medications appear as a factor in approximately 17% of driver-involved crashes. Antihistamines, sleep aids, and decongestants all affect alertness. Drivers taking these medications may not be in violation of any controlled substance rule, but impairment is impairment regardless of whether the substance is prescription or available at a gas station counter.
Dispatch communications add another layer. Drivers receive route updates, delivery changes, and check-in requests while moving. In-cab GPS systems require interaction. These are recognized distraction vectors, and the carrier’s role in creating communication pressure matters to the liability analysis.
Motor Carrier Negligence: When the Company Is Liable
The trucking company’s legal exposure does not depend on whether the driver did something wrong. Carriers can be independently liable for their own negligence, separate from any driver error.
respondeat superior
Latin for “let the master answer.” A legal doctrine holding employers liable for negligent acts committed by employees within the scope of their employment.
Under the doctrine of respondeat superior, trucking companies are responsible for the conduct of drivers operating within the scope of employment. But the carrier’s independent liability goes further than that.
negligent entrustment
A legal theory holding a vehicle owner or employer liable for knowingly allowing an unqualified, incompetent, or reckless person to operate a vehicle. Applies when the company knew or should have known about the driver’s unfitness.
negligent entrustment applies when a carrier places an unqualified driver behind the wheel. This theory reaches situations where the driver’s record would have disqualified them if anyone had actually checked it. Under 49 C.F.R. Part 391, carriers must verify a driver’s employment and accident history for the previous three years before hiring. Failing that step is its own FMCSA violation.
Improper training is a separate carrier failure. FMCSA regulations require carriers to provide documented training on hours-of-service rules, vehicle inspection procedures, and cargo securement standards. When a driver causes a crash because of a task they were never properly trained on, the carrier bears liability for skipping that training. It is not just the driver’s mistake.
Companies that set delivery schedules that are impossible to meet within legal HOS limits shift liability to themselves. The driver who pushes through an illegal rest shortcut to meet a deadline is not the only negligent party. The carrier that created the impossible schedule shares that negligence.
The carrier’s FMCSA Safety Measurement System profile shows inspection histories, violation patterns, and prior crash data. A carrier with a pattern of HOS violations or failed inspections is a different legal target than one with a clean record. The history affects both liability and damages.
Improper Cargo Loading and Third-Party Liability
Cargo shifting and unsecured loads contribute to roughly 4% of truck crash factors. That number understates the severity. A load shift at highway speed on an 80,000-pound vehicle is a catastrophic event.
FMCSA cargo securement rules at 49 C.F.R. Part 393 set specific standards for load distribution, tie-down requirements, and maximum cargo weight by axle. Violations of these rules are documented at weigh stations and roadside inspections. Those inspection records are evidence.
The party that loaded the truck is not always the trucking company. Shipping companies, warehouse operators, and third-party logistics providers often handle loading. When an improperly loaded trailer causes a crash, the loading party can be independently liable under Louisiana law. That liability is separate from the driver’s and the motor carrier’s. Your attorney needs to identify all parties in the chain.
Overloaded trucks create extended stopping distances and higher rollover risk. Hazardous material loads carry additional federal requirements under 49 C.F.R. Parts 171-180. A HAZMAT violation that contributes to a crash creates regulatory exposure that goes beyond standard negligence.
The bill of lading, the weigh station records, and the loading documentation establish who loaded the trailer and how. These documents are part of identifying every party in the chain of liability.
Mechanical Failure: When Equipment Is the Problem
Equipment failures play a role in approximately 10% of large truck crashes. Brake problems alone contribute to roughly 29% of truck accidents where equipment is a factor. Tire failures (blowouts, tread separation, underinflation) account for about 6% of equipment-related crashes.
Under federal regulations, commercial drivers are required to conduct pre-trip inspections before each journey and document the results. Carriers must maintain those inspection records and address any deficiencies before the vehicle returns to service. When a truck with a known brake problem or documented tire wear is put back on the road without repair, the carrier has independent negligence for that decision.
Strict Liability
A legal standard where the manufacturer is liable for a defective product without the injured person having to prove the manufacturer was negligent. You prove the defect existed and caused the injury.
Manufacturer defects create a separate legal pathway. If a truck component was defectively designed or manufactured, Strict Liability applies. You do not have to prove the manufacturer was careless. You prove the defect existed and that the defect caused your injury. This is a different standard with different proof requirements, and it expands the pool of responsible parties.
The physical vehicle and parts must be preserved for inspection. Once a truck is repaired and returned to service, the physical evidence is gone, and carriers have every incentive to put their equipment back to work quickly. Preserving the truck immediately is what keeps that evidence available.
Environmental Factors and Road Conditions
Weather-related factors (rain, fog, ice, high winds) account for roughly 3% of large truck crashes. That is a smaller share than driver error, but it is not a defense. Commercial drivers are trained and required to adjust speed, following distance, and driving behavior for conditions. A driver who fails to do so in rain or fog is negligent, regardless of the weather.
Louisiana’s highway network creates specific hazard patterns. The I-10, I-20, and I-49 corridors carry heavy commercial freight traffic through conditions that range from Gulf Coast humidity and fog to north Louisiana winter ice. Construction zones along these corridors are a recurring factor in truck crashes. When construction zone layout or signage contributed to a crash, the Louisiana Department of Transportation and Development (LaDOTD) or the construction contractor may carry independent liability alongside the driver and carrier.
Louisiana’s crash data reflects a state with above-average road risk. According to IIHS fatality statistics, Louisiana recorded a 2023 motor vehicle fatality rate of 21 deaths per 100,000 population, compared to the national average of 12.2. The FMCSA crash database recorded 3,875 large trucks involved in fatal and non-fatal crashes in Louisiana in FY2022. Parish-specific crash data, including corridor-level analysis, is compiled by LSU’s Center for Analytics and Research in Transportation Safety (CARTS).
Construction zone accidents involving trucks carry specific investigative requirements. The zone’s design, signage compliance, and contractor negligence all enter the liability analysis alongside driver conduct.
Government liability is in play in road condition and construction zone cases. LaDOTD and contractor negligence claims have different procedural requirements than standard car-versus-truck cases, and a liability analysis that focuses only on the driver and carrier misses that part of the picture.
What Does Louisiana Law Require You to Prove in a Truck Accident Case?
Louisiana follows a negligence standard: duty, breach, causation, and damages. The cause of the crash determines who breached a duty to you, and that is why the investigation comes first.
Comparative Fault
A legal rule that reduces your recovery by your percentage of fault. In Louisiana, if you are 51% or more at fault, you recover nothing. If you are 50% or less at fault, your damages are reduced proportionally.
Comparative Fault applies to truck accident claims in Louisiana. Under La. C.C. Art. 2323, effective January 1, 2026, if you are 51% or more at fault, you recover nothing. This is a hard cutoff, not a sliding scale. Insurance adjusters routinely build defenses around pushing your fault percentage above that threshold, which is why fault is contested at the investigation stage, before the other side builds its narrative.
Prescriptive Period
Louisiana’s term for statute of limitations. The legal deadline to file a lawsuit. For personal injury, it is two years from the date of injury under La. C.C. Art. 3493.1 (effective July 1, 2024).
The Prescriptive Period for personal injury claims in Louisiana is two years from the date of injury, under La. C.C. Art. 3493.1, effective July 1, 2024. The former one-year deadline was repealed in 2024 and no longer applies to injuries on or after that date.
Louisiana’s 2024-2025 tort reform also modified evidence presentation rules and comparative fault calculation procedures in ways that affect truck accident claims specifically.
Preservation Letter
A formal legal demand sent to the trucking company requiring them to preserve all evidence related to the crash. Stops the carrier from overwriting black box data or destroying driver logs on their normal retention schedule.
Evidence in truck accident cases is time-sensitive. The ECM data window is approximately 30 days. ELD records have defined retention periods. Driver qualification files, drug test results, and maintenance records are all subject to normal carrier document retention and destruction schedules. A Preservation Letter stops that clock. It must go out immediately after engagement, not weeks later.
Morris & Dewett: Experience Across the Liability Chain
Morris & Dewett has represented Louisiana truck accident clients for over 25 years. Our attorneys hold AV Preeminent ratings, the highest peer rating available from Martindale-Hubbell. We’ve earned recognition from Super Lawyers and maintain 2,498 five-star Google reviews from clients across Louisiana. We handle cases statewide, from the I-10 corridor between Baton Rouge and Lafayette to the I-20 and I-49 routes serving north Louisiana.
Our case results are available to review at our results page. We do not quote dollar amounts here. View the results and judge for yourself.