Understanding the terminology used in truck accident cases can help you navigate the legal process. This glossary covers FMCSA regulations, legal terms, and insurance concepts.
A common term for a tractor-trailer combination that has 18 wheels total. Also called a semi-truck, big rig, or tractor-trailer. The tractor (front portion) has 10 wheels, and the trailer (rear portion) has 8 wheels. These vehicles can weigh up to 80,000 pounds when fully loaded, compared to approximately 4,000 pounds for an average passenger car.
An accident occurring when another vehicle is in one of the truck's blind spots, also called "No-Zones." Commercial trucks have large blind spots on all four sides: directly behind the trailer (up to 200 feet), along both sides (especially the right side), and directly in front of the cab. Approximately one-third of crashes between trucks and cars occur in blind spots.
The Engine Control Module (ECM) or Event Data Recorder (EDR) in a commercial truck that records vehicle data before, during, and after a crash. This data can include speed, brake application, throttle position, seat belt use, and other critical information. Unlike ELDs, black box data provides moment-by-moment details of the crash itself and is invaluable evidence in accident reconstruction.
A document issued by a carrier that details the type, quantity, and destination of goods being carried. In truck accident cases, bills of lading can prove what cargo was being transported, its weight, and whether overloading may have contributed to the accident. Overloaded trucks require longer stopping distances and are more prone to brake failure and rollovers.
A special license required to operate commercial motor vehicles (CMVs) including semi-trucks, tanker trucks, and large buses. CDL requirements include passing knowledge tests, skills tests, and meeting medical certification requirements. CDL holders are subject to stricter drug and alcohol testing requirements and a lower blood alcohol limit (0.04% vs 0.08%).
Source: FMCSA 49 CFR Part 383
A vehicle used in commerce to transport passengers or property that weighs 10,001 pounds or more, is designed to transport 16 or more passengers including the driver, or is used to transport hazardous materials. CMVs are subject to FMCSA regulations and their drivers must hold a CDL.
Source: FMCSA 49 CFR 390.5
Texas follows a "modified comparative negligence" rule under Texas Civil Practice & Remedies Code Section 33.001. This means you can recover damages if you are partially at fault for the accident, but only if you are less than 51% responsible. Your compensation is reduced by your percentage of fault. For example, if you are 30% at fault and damages total $100,000, you can recover $70,000.
Source: Texas Civil Practice & Remedies Code §33.001
Monetary compensation intended to make the injured party "whole" by covering actual losses. This includes economic damages (medical bills, lost wages, property damage, future medical care) and non-economic damages (pain and suffering, mental anguish, loss of enjoyment of life, disfigurement). Texas does not cap compensatory damages in most personal injury cases.
A fee arrangement where an attorney is paid a percentage of the settlement or verdict amount rather than an hourly rate. The client pays no upfront costs, and the attorney only gets paid if the case is successful. Typical contingency fees for truck accident cases range from 33% to 40%, depending on whether the case settles or goes to trial.
A unique identifier assigned by the U.S. Department of Transportation to commercial motor carriers operating in interstate commerce. The DOT number is displayed on the side of commercial trucks and can be used to look up a trucking company's safety record, inspection history, and crash data in the FMCSA's Safety Measurement System (SMS) database.
Source: Federal Motor Carrier Safety Administration
A file that trucking companies must maintain for each driver under FMCSA regulations. The DQF must include: application for employment, motor vehicle record (MVR), road test certificate or equivalent, annual review of driving record, medical examiner's certificate, and any previous drug/alcohol test violations. DQF records can reveal negligent hiring or inadequate supervision.
Source: FMCSA 49 CFR Part 391
An electronic device required by federal law since December 2017 that automatically records a driver's driving time and Hours of Service compliance. ELDs connect to the truck's engine to capture data on whether the vehicle is moving, engine hours, miles driven, and more. This data is critical evidence in truck accident cases. Federal regulations only require ELD data to be retained for 6 months.
Source: FMCSA ELD Rule 49 CFR Part 395.8
The Federal Motor Carrier Safety Administration is the U.S. government agency responsible for regulating commercial motor vehicles (CMVs) and their operators. The FMCSA establishes and enforces safety regulations for commercial trucks, including Hours of Service rules, driver qualifications, and vehicle maintenance standards.
Source: Federal Motor Carrier Safety Administration
Federal regulations that limit the number of hours commercial truck drivers can operate their vehicles. Under current FMCSA rules, drivers may drive a maximum of 11 hours after 10 consecutive hours off duty. Drivers must take a 30-minute break after 8 hours of driving. These rules are designed to prevent fatigue-related accidents.
Source: FMCSA 49 CFR Part 395
An accident where a tractor-trailer folds at the pivot point between the tractor and trailer, forming a shape resembling a folding knife. This typically occurs when the tractor's drive wheels lock up during braking, causing the trailer to swing outward. Jackknife accidents are often caused by sudden braking, wet or icy roads, improper braking technique, or brake system failures.
FMCSA regulations require commercial trucks to carry minimum liability insurance based on the cargo they transport. General freight carriers must carry at least $750,000, oil transporters must carry $1 million, and hazardous materials transporters must carry up to $5 million in coverage. This is significantly higher than the minimum auto insurance required for passenger vehicles.
Source: FMCSA 49 CFR Part 387
The point at which an injured person's condition has stabilized and is unlikely to improve substantially with further medical treatment. Reaching MMI is important in personal injury cases because it establishes the permanent nature of injuries and allows for accurate calculation of future medical expenses and long-term disability.
The failure to exercise reasonable care that a prudent person would exercise under similar circumstances, resulting in harm to another person. In truck accident cases, negligence can include speeding, distracted driving, driving while fatigued, failing to maintain the vehicle, or violating FMCSA regulations. Proving negligence requires showing duty, breach, causation, and damages.
A legal claim against a trucking company for hiring a driver who was unqualified, had a poor driving record, failed drug tests, or lacked proper training. Trucking companies have a duty to verify driver qualifications and review their safety history before hiring. Failure to properly vet drivers can result in additional liability for accidents.
Additional damages awarded to punish the defendant for particularly egregious or reckless conduct and to deter similar conduct in the future. In Texas, punitive damages (called "exemplary damages") may be awarded in truck accident cases involving gross negligence, such as drunk driving, falsified logs, or knowingly allowing unsafe vehicles to operate. Punitive damages are capped in Texas at the greater of: twice the economic damages plus non-economic damages up to $750,000, or $200,000.
Source: Texas Civil Practice & Remedies Code §41.008
An accident where a truck tips over onto its side or roof. Rollover accidents often occur due to excessive speed in curves, improper cargo loading that shifts the center of gravity, driver overcorrection, or tire blowouts. Trucks with a high center of gravity, particularly tanker trucks and flatbeds, are more susceptible to rollovers.
A tractor unit designed to tow semi-trailers. The term "semi" refers to the trailer, which lacks front wheels and is supported by the tractor's fifth wheel coupling. Semi-trucks are the most common type of commercial truck involved in serious accidents due to their size and prevalence on roads.
The legal deadline by which a lawsuit must be filed. In Texas, the statute of limitations for personal injury claims from truck accidents is 2 years from the date of the accident (Texas Civil Practice & Remedies Code Section 16.003). Missing this deadline typically bars you from recovering any compensation. Claims against government entities may have shorter notice periods.
Source: Texas Civil Practice & Remedies Code §16.003
The intentional or negligent destruction, alteration, or failure to preserve evidence that is relevant to litigation. A "spoliation letter" is a formal legal notice requiring parties to preserve evidence. In truck accident cases, this is critical because ELD data, black box data, and driver logs may be routinely deleted if not specifically preserved. Spoliation can result in sanctions against the destroying party.
The legal right of an insurance company to pursue a third party that caused the insurance loss to the insured. For example, if your health insurance pays for medical bills from a truck accident, they may have a subrogation right to recover those payments from the truck driver's insurance or any settlement you receive.
A commercial truck designed to carry liquid cargo in a cylindrical tank. Tanker trucks carry fuel, chemicals, milk, and other liquids. They are particularly dangerous in accidents because liquids can slosh during sudden stops or turns (known as "surge"), making the vehicle harder to control. Tankers carrying hazardous materials require additional insurance coverage up to $5 million.
A brain injury caused by a blow or jolt to the head, or a penetrating head injury. TBI is common in truck accidents due to the violent forces involved. Symptoms can range from mild (concussion) to severe (coma, permanent disability). Importantly, TBI symptoms may not appear immediately after an accident, which is why medical evaluation within 24-48 hours is critical.
A catastrophic type of accident where a smaller vehicle slides underneath the trailer portion of a semi-truck, either from the rear or the side. Underride accidents often result in fatalities because the passenger compartment of the smaller vehicle can be crushed or sheared off. Federal regulations require rear underride guards, but side underride guards are not currently mandated.
A legal doctrine that holds an employer responsible for the negligent actions of their employees when acting within the scope of employment. In truck accident cases, this allows injured parties to sue the trucking company for a driver's negligence, not just the individual driver. Trucking companies typically have much higher insurance coverage than individual drivers.
Maximum legal weight for a fully loaded 18-wheeler, compared to approximately 4,000 lbs for an average passenger vehicle.
Source: FMCSA Weight Limits 23 CFR 658.17
Maximum driving time allowed per day under FMCSA Hours of Service regulations, after 10 consecutive hours off duty.
Source: FMCSA 49 CFR Part 395
Statute of limitations for filing a personal injury lawsuit after a truck accident in Texas.
Source: Texas Civil Practice & Remedies Code §16.003
Minimum required liability insurance for general freight trucks under FMCSA regulations. Hazmat carriers require up to $5 million.
Source: FMCSA 49 CFR Part 387
Understanding the terminology is the first step. Get a free case review from an experienced attorney who can explain how these concepts apply to your specific situation.
