Washington Semi-Truck/18-Wheeler Accident Lawyer

A semi-truck crashes into you, but the driver may be only one part of the story. The trucking company, the owner of the tractor or trailer, a maintenance provider, or another business may have made decisions that contributed to what happened.

A Washington semi-truck accident lawyer can investigate those relationships, determine which evidence matters, and identify the people or companies whose conduct may have contributed to the crash.

At Brett McCandlis Brown & Conner, we help injured people understand what happened, how Washington law may assign responsibility, and what sources of recovery may be available. Truck claims are not automatically more valuable because a commercial vehicle was involved. Their strength depends on the evidence, the parties involved, the injuries, and how fault is ultimately allocated. A careful investigation can clarify those questions before you make important decisions about your claim.

What Should a Washington Truck-Accident Investigation Determine First?

One of the first questions is not simply, “What did the truck driver do?” It is, “Who was responsible for each part of the operation that may have contributed to the crash?”

A commercial truck can involve several separate relationships. An investigation may need to determine:

• Who controlled the driver. The driver may have been employed, dispatched, or otherwise directed by a motor carrier.
• Who owned or leased the equipment. The tractor and trailer may have different owners or separate leasing arrangements.
• Who maintained the truck. Inspections, repairs, brakes, tires, or other systems may have been handled by the carrier, an owner, or an outside contractor.
• Who handled the cargo. Another business may have loaded or secured the freight if cargo movement or weight contributed to the crash.

Those relationships matter only when they connect to the cause of the collision. A maintenance contractor is not responsible merely because it worked on the truck, and a loading company does not belong in the case simply because it touched the cargo. The investigation must determine what each person or business actually did and whether that conduct contributed.

That distinction matters under Washington’s fault-allocation law. When more than one entity caused the claimant’s damages, the factfinder generally determines the percentage of total fault attributable to each responsible entity. The law also contains exceptions, including for certain agency or servant relationships.

For a semi-truck accident attorney, the early investigation is less about assembling the longest possible defendant list and more about building an accurate map of responsibility.

How Can a Lawyer Trace Responsibility Through the Trucking Operation?

A trucking company’s responsibility does not depend simply on its name appearing on the truck. The question is how the company was connected to the conduct that caused the collision. That may involve responsibility for the driver, the company’s own conduct, or both.

Was the Driver Acting for the Trucking Company?

If a driver commits a tort (i.e., harms someone) while acting within the scope of employment, the employer may be held vicariously liable for the driver’s conduct. The driver’s employment status and what the driver was doing at the time of the crash therefore matter.

A company’s own conduct can create a separate issue. In 2026, the Washington Supreme Court confirmed that negligent retention and vicarious liability are distinct theories and may be pleaded together. Negligent retention depends on evidence that the employer knew the employee was unfit or failed to use reasonable care to discover the unfitness, along with the required causal connection to the injury.

An 18-wheeler accident lawyer in Washington can review the employment relationship and company records to determine which theories the evidence supports, rather than assuming every truck case involves the same claims.

Did Another Company Contribute to the Collision?

A business outside the driver-employer relationship may matter if its own work contributed to the crash.

Depending on the evidence, an investigation may examine:

• Maintenance and repairs. Who inspected or repaired the brakes, tires, steering, or other relevant systems?
• Equipment ownership or leasing. Did an owner or lessor retain responsibility for maintenance, inspection, or another function connected to the crash?
• Cargo loading or securement. Did the way freight was loaded, distributed, or secured contribute to instability or loss of control?
• Other operational decisions. Did another company control a function that played a meaningful role in causing the collision?

A company’s place in the transportation chain is not enough by itself. The evidence must connect its conduct to the collision. A tractor-trailer accident claim therefore requires determining which companies actually belong in the liability analysis.

What Evidence Can Show Where the Breakdown Occurred?

The evidence can help separate problems that developed inside the trucking operation from what physically occurred on the road.

What Do the Trucking Company’s Records Show?

Depending on the operation and issues in dispute, useful records may include:

• Driving-time records. Logs and electronic records, where required, can help show how long the driver had been driving or on duty.
• Dispatch communications. Messages and trip information may show what instructions the driver received and how the trip was managed.
• Driver records. Qualification and training materials may help evaluate whether the driver met applicable requirements.
• Maintenance and inspection records. These documents may identify mechanical concerns, repairs, or responsibility for keeping the truck safe.

The Washington State Patrol has adopted many federal motor-carrier regulations for motor carriers used in intrastate or interstate commerce, including rules addressing driver qualifications, hours of service, vehicle equipment, and inspection and maintenance. A commercial truck accident lawyer in Washington can determine which requirements and records apply to the particular operation.

What Does the Physical and Electronic Crash Evidence Show?

Electronic vehicle data, post-crash inspections, photographs, video, witness accounts, vehicle damage, road evidence, and reconstruction may help establish speed, braking, movement, mechanical condition, and collision sequence.

Those sources can also test the company records. A maintenance file may show that work was performed before a mechanical failure, for example, while post-crash inspection findings may help determine whether the same system contributed to the collision.

A trucking safety violation can matter without automatically deciding the case. Under Washington law, most breaches of duties imposed by statutes or administrative rules may be considered as evidence of negligence rather than negligence per se. The statute identifies specific exceptions, so the effect of a particular violation should be evaluated rather than assumed.

A big rig accident lawyer can use company records and crash evidence together to test whether the claimed cause is supported.

How Does Washington Law Affect Who Pays and How Much?

A semi-truck collision does not come with a preset claim value. Recovery depends on the losses you can prove, how Washington law assigns fault, and which responsible parties and sources of recovery apply.

What If More Than One Person or Company Was at Fault?

Washington follows comparative fault. If you contributed to the collision, your percentage of fault reduces your compensatory damages but does not bar recovery.

For example, if a claimant proved they suffered $500,000 in legitimate compensatory damages but was found 20% at fault, their award would be reduced by 20%. When multiple defendants or other at-fault entities are involved, Washington’s allocation rules can also affect how responsibility and judgment are divided. Agency relationships and statutory exceptions may change that analysis.

A Washington semi-truck accident lawyer can compare fault allegations with the physical evidence, company records, and legal relationships rather than treating an insurer’s proposed percentage as the final answer.

What Makes a Truck Claim Worth More or Less?

The size of the truck does not determine the size of the recovery.

Important considerations include:

• Permanent impairment, lengthy treatment, and continuing limitations can affect the losses supported by the evidence.
• Future financial consequences. Ongoing medical needs and reduced earning capacity may matter beyond expenses and wages already lost.
• Strength of the evidence. Disputes over fault, causation, or whether particular losses resulted from the crash can affect value.
• Responsible parties and available coverage. Commercial operations can involve insurance and financial responsibility requirements different from those applicable to ordinary motorists.

Coverage still has to be verified for the particular carrier and operation. For example, FMCSA lists a $750,000 bodily-injury/property-damage insurance requirement for qualifying for-hire, non-hazardous property carriers with a gross vehicle weight rating of at least 10,001 pounds. Federal applicability depends on the carrier and operation, and other operations may have different requirements.

A tractor-trailer accident claim should be valued from its actual evidence and available recovery sources, not an online settlement average.

What Happens After the Responsible Parties and Evidence Are Identified?

Once the investigation shows who may be responsible and what evidence supports the claim, the focus shifts to building a complete case for recovery:

1. Confirming the parties and insurance. Identify the people and companies whose conduct may support liability and the insurance or other recovery sources that apply.
2. Developing the evidence. Analyze trucking records, crash evidence, medical records, employment information, and other documentation together.
3. Documenting the full losses. Account for current expenses and income loss as well as reasonably supported future treatment, earning consequences, and long-term limitations.
4. Evaluating fault disputes. Compare allegations that you or another party shares responsibility with the evidence and Washington’s fault rules.
5. Presenting and negotiating the claim. Pursue a resolution after the liability and damages picture is sufficiently developed.
6. Preparing for litigation when necessary. If a reasonable resolution is not available, the case may need to proceed through a lawsuit and toward trial.

Washington law generally requires an action for injury to a person to be commenced within three years. That filing period is not a reason to postpone investigating a commercial-truck crash. If a government entity may be responsible, additional claim-presentment requirements can also apply.

A semi-truck accident attorney can manage that progression while you make informed decisions about how the case moves forward.

What Should You Look for in a Washington Semi-Truck Accident Lawyer?

A big rig accident lawyer should treat the collision as a commercial-truck case from the beginning, not simply as a larger car accident. That means being prepared to analyze business relationships, truck-specific records and regulations, competing fault theories, available coverage, and the long-term effects of serious injuries.

Brett McCandlis Brown & Conner has more than 40 years of combined personal injury experience, with results that include a $1 million recovery for a client severely injured in a head-on tractor-trailer collision involving bad brakes. Those facts matter because a truck case may require counsel to connect technical and commercial evidence to the legal theory of responsibility and prepare the claim for litigation if necessary. Our team includes dedicated legal representation across Washington State, including working with an experienced Seattle truck accident lawyer to advocate for victims and their families.

Get a Clear Plan for Your Washington Truck Accident Claim

If you or a family member was seriously injured in a semi-truck or 18-wheeler collision, Brett McCandlis Brown & Conner can review what happened and explain which issues deserve attention. Our firm prepares cases for trial when necessary and offers free consultations. Contact our office to understand the next steps available in your claim.

Legal References Used to Inform This Page

To ensure the accuracy and clarity of this page, we referenced official legal and other resources during the content development process:

• RCW 4.22.005 — comparative fault and proportional reduction of compensatory damages.
• RCW 4.22.070 — allocation of responsibility among at-fault entities and statutory exceptions.
• Earl v. Campbell, No. 104495-0 (Wash. Sept. 3, 2026) — vicarious liability and negligent-retention theories.
• WAC 446-65-010 — Washington’s adoption of specified federal commercial-motor-carrier regulations.
• RCW 5.40.050 — statutory and regulatory violations as evidence of negligence and the listed negligence-per-se exceptions.
• Federal Motor Carrier Safety Administration — insurance filing and financial-responsibility requirements for regulated motor carriers.
• RCW 4.16.080 — Washington’s general three-year filing period for personal-injury actions.
• RCW 4.92.100 — claim-presentment requirements involving tort claims against Washington State.
• RCW 4.92.110 — filing requirements following presentment of a tort claim against Washington State.
• RCW 4.96.020 — claim-presentment requirements involving Washington local governmental entities.