Louisiana Highway Accident Lawyer

Morris & Dewett has handled Louisiana automobile injury cases for more than 25 years.

Why Highway Accidents Cause More Severe Injuries

Speed is the central variable. Louisiana interstates post limits of 65 to 75 mph on I-10, I-20, and I-49. At those speeds, kinetic energy at impact is exponentially higher than on surface roads. Crumple zones, airbags, and restraint systems absorb less of that force.

Multi-lane highways create crash patterns that surface roads don’t. Sideswipes, chain-reaction pileups, and wrong-way head-on collisions all occur at closing speeds that leave no margin for error. A rear-end collision at 65 mph is structurally different from the same collision at 35 mph. The physics are not comparable.

Emergency response is slower on rural interstate stretches. I-49 through central Louisiana, I-10 across the Atchafalaya Basin, and US-171 through western Louisiana parishes all have segments where EMS response time is measured in tens of minutes. That gap affects outcomes in serious trauma cases.

Traumatic Brain Injury

A brain injury caused by a sudden blow or jolt to the head. Symptoms range from concussion to permanent cognitive damage. Not always visible on initial imaging; follow-up neurological evaluation is often necessary.

Traumatic Brain Injury Louisiana consistently ranks among the highest states for traffic fatalities per vehicle miles traveled, according to NHTSA FARS data and the Louisiana Highway Safety Commission. Spinal cord injuries, multiple fractures, internal organ damage, and wrongful death are documented outcomes of high-speed highway crashes.

Cases at highway speeds require expert accident reconstruction and early evidence preservation that differs from typical surface-road collisions.

Common Causes of Highway Accidents in Louisiana

Speed and inattention drive most highway crashes. Excessive speed compresses reaction time. At 75 mph, a vehicle travels 110 feet per second. A two-second phone glance means 220 feet of unmonitored travel. Louisiana’s I-10, I-20, I-49, and I-220 corridors carry both high-volume daily traffic and long-haul commercial freight.

Distracted driving is a documented factor in a substantial share of fatal crashes nationally. Cell phone use at highway speed is the most common form. In-vehicle entertainment and navigation systems are secondary contributors. Distraction evidence comes from phone records, which require a subpoena and litigation to obtain. The window to demand preservation of that data is short.

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.

Drowsy and fatigued driving is a specific hazard on Louisiana’s freight corridors. Drivers on I-10 and I-20 are frequently operating on the edge of federally permitted Hours of Service limits. Commercial trucks are required to carry ELD data. That record is critical evidence in crashes involving commercial carriers.

Drunk and impaired driving remains a significant cause of Louisiana interstate crashes. Wrong-way driving on interstates is a related category. Causes include intoxication, medical emergency, and interchange confusion. These collisions are almost always head-on and catastrophic.

LaDOTD

Louisiana Department of Transportation and Development. The state agency responsible for designing, building, and maintaining Louisiana’s highways, bridges, and interstates.

Large commercial trucks on I-10 and I-20 create specific hazards: wide blind spots, extended stopping distances, and cargo that can shift or separate. Defective road conditions on LaDOTD managed routes are also a documented cause. Missing reflectors, faded lane markings, and poorly designed construction zones all contribute to crashes.

Government entity liability, truck carrier liability, and road defect claims each have separate procedural requirements.

Who Is Liable for a Louisiana Highway Accident?

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 Louisiana uses a modified comparative fault system with a 51% bar. Under La. C.C. Art. 2323, effective January 1, 2026, if you are 51% or more at fault for the accident, you recover nothing. If you are 50% or less at fault, your damages are reduced by your fault percentage. Insurance adjusters build their defense around pushing your percentage above 50%.

The at-fault driver is the most straightforward defendant. Proving negligence requires establishing duty, breach, causation, and damages. Police citations, witness statements, and crash reconstruction evidence form the core of that proof.

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.

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.

Trucking companies carry liability if the driver was on-duty at the time of the crash. Respondeat Superior applies to on-duty drivers. Negligent Entrustment applies when the carrier hired or retained a driver with a known disqualifying history.

LaDOTD or another government entity can be liable when a road defect contributed to the crash. Crumbling pavement, missing lane markers, inadequate signage in a construction zone, and defective drainage patterns are all documented defect types. A claim against the state or a political subdivision is subject to the same general two-year prescriptive period as any other delict; Louisiana imposes no pre-suit notice-of-claim requirement for these tort claims. The 90-day rule that applies is procedural: under La. R.S. 13:5107(D), service of citation on the government defendant must be requested within 90 days of filing the suit, or the suit may be dismissed without prejudice as to that defendant.

Vehicle manufacturers can be liable if a defective component caused or contributed to loss of control. Tire failure, steering malfunction, and brake failure are documented examples. Claims against manufacturers proceed under the Louisiana Products Liability Act, La. R.S. 9:2800.51 through 9:2800.59. Construction contractors working on highway projects can also be liable for unsafe work zones and inadequate temporary traffic control.

Government entity claims, product liability claims, and trucking company claims each require different investigation approaches and procedural steps.

What Evidence Determines a Louisiana Highway Accident Case?

The Louisiana State Police crash report is the starting point. State troopers respond to the vast majority of interstate crashes. The report documents the trooper’s findings, any citations issued, measurements, and contributing factors. Louisiana State Police Troop B covers the I-20/I-49 northwest Louisiana corridor (headquartered in Bossier City). Troop L covers the I-10/I-12 southeast Louisiana corridor. Troop E covers I-49 through central Louisiana. Request the full crash report, not just the summary.

Traffic cameras are the most time-sensitive evidence. LaDOTD operates a network of highway cameras along major corridors for traffic management. Commercial properties near interchanges also have exterior cameras. Footage is typically retained for 30 to 72 hours before it is overwritten. A preservation demand must go out within the first 24 to 48 hours.

EDR

Event Data Recorder. A device in modern passenger vehicles that captures pre-crash data including speed, braking, throttle position, and seatbelt status. Sometimes called the “black box.” Data can be overwritten or lost if the vehicle is repaired or destroyed.

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.

EDR data from the at-fault vehicle captures pre-impact speed, braking, and steering inputs. For commercial trucks, the ECM contains this data. Both require a formal preservation demand to prevent overwrite. Waiting forfeits this evidence permanently.

ELD data from commercial trucks documents hours of service compliance. If the driver was fatigued or over their permitted driving hours, ELD records prove it. Cell phone records document distracted driving. Both require litigation subpoenas. The demand for preservation must happen before litigation begins.

Witness accounts from other drivers, passengers, and commercial drivers on the same route are valuable in disputed-fault cases. Expert accident reconstruction is necessary in high-speed, multi-vehicle, or split-liability scenarios. Reconstruction experts work backward from physical evidence: skid marks, gouge marks, debris fields, and vehicle final positions. That analysis establishes what happened and at what speed.

Louisiana Legal Deadlines and Insurance Rules for Highway Claims

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).

Prescriptive Period The standard deadline for a personal injury claim in Louisiana is two years from the date of injury under La. C.C. Art. 3493.1 (effective July 1, 2024). Before the 2024 reform, the deadline was one year. Missing the prescriptive period bars your claim entirely.

Government entity claims run on the same general two-year prescriptive period; there is no special shorter deadline and no pre-suit notice-of-claim requirement for a tort claim against the state or a political subdivision. The 90-day rule that applies is procedural and runs from filing, not from the accident: under La. R.S. 13:5107(D), service of citation on the government defendant must be requested within 90 days of commencing the action, or the suit may be dismissed without prejudice as to that defendant.

UM/UIM

Uninsured/Underinsured Motorist coverage. A provision in your own auto insurance policy that pays you when the at-fault driver has no insurance (UM) or not enough insurance (UIM) to cover your damages. Louisiana law requires insurers to offer it, and it can stack across multiple vehicles on your policy.

UM/UIM Under La. R.S. 22:1295, Louisiana insurers must offer UM/UIM coverage. If the at-fault driver was uninsured or underinsured, your own policy may cover the gap. UM/UIM coverage can stack across multiple vehicles on the same policy, which is particularly valuable in serious injury cases.

Louisiana’s No Pay No Play rule under La. R.S. 32:866 bars uninsured drivers from recovering the first $15,000 in property damage and $25,000 in personal injury from another party. If you were driving without insurance at the time of the crash, this offset applies to your recovery. The rule does not bar the entire claim. It reduces what you can recover in those two categories.

Louisiana’s 2024-2025 tort reform package made several changes relevant to highway accident claims. The direct action statute, which allows injured parties to sue an insurer directly, was preserved. The collateral source rule was narrowed, limiting some double-recovery arguments. The Housley presumption, which had benefited plaintiffs in causation disputes, was eliminated.

How Morris & Dewett Handles Highway Accident Cases

Highway crashes require immediate action on evidence. Morris & Dewett’s process starts with a preservation demand for EDR and black box data, camera footage, and ELD records within the first 24 to 48 hours. That window matters because the evidence that wins these cases disappears first.

When liability is disputed or involves multiple parties, Morris & Dewett retains accident reconstruction experts. Reconstructionists can establish speed, point of impact, and fault allocation from physical evidence. In multi-defendant cases involving a trucking company, a road defect, and the driver, expert analysis provides the foundation for each separate claim.

Morris & Dewett has handled Louisiana automobile injury cases for more than 25 years, including serious highway and interstate crashes. The firm is AV Preeminent rated by Martindale-Hubbell, Super Lawyers listed, and has received more than 2,498 five-star Google reviews from clients. View our case results.

Contingency Fee

A fee arrangement where the attorney is paid a percentage of the recovery and only if there is a recovery. The client pays nothing upfront and owes no attorney fees if the case is unsuccessful.

Contingency Fee Morris & Dewett handles these cases on contingency. No fees unless there is a recovery.