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How Can You Prove Liability in Auto Accident Cases Involving Multiple Parties?

Gerstner Adam Law Sept. 13, 2025

When injuries are severe, building a compelling case is essential to clearly establish accountability and the extent of liability. In Montana, auto accident liability involving multiple parties is often governed by comparative fault principles. Understanding how these rules apply, identifying the most critical evidence, and employing effective strategies are key to strengthening a personal injury claim in such cases.

At Gerstner Adam Law, we have represented countless clients in auto accident cases involving more than one responsible party. We know how stressful these accidents can be for the victims, as questions of liability become harder to sort out when multiple drivers, companies, or even government entities may share responsibility. Located in Billings, Montana, our firm serves communities in Glendive, Miles City, and Sidney.

Comparative Fault Under Montana Law

In Montana, auto accident cases involving multiple parties are decided under the principle of comparative fault. This means that a court or jury assigns a percentage of responsibility to each party whose actions contributed to the accident. 

A plaintiff can still recover damages as long as they’re found to be less than 51% at fault. However, the amount recovered will be reduced in proportion to their percentage of fault. When multiple defendants are involved, the court divides liability among them based on their share of fault. 

This system makes it especially important in personal injury cases to gather evidence that accurately demonstrates the conduct of each party involved.

Common Multi-Party Auto Accident Scenarios

Auto accidents involving multiple parties can take several forms. Some of the most common situations we see include chain-reaction crashes, collisions involving commercial vehicles, and accidents where defective products or unsafe road conditions play a role. In each of these cases, establishing liability requires careful investigation.

Chain-reaction crashes are common during Montana winters, when icy roads and poor visibility increase the risk of pileups. In such accidents, determining who struck whom first and whether one driver’s negligence set off a chain of events becomes central to the personal injury claim.

Collisions involving commercial trucks often bring additional parties into the picture, such as the trucking company, the cargo loader, or even a vehicle maintenance provider. 

Defective parts, like faulty brakes or tires, can also give rise to claims against manufacturers. Similarly, if unsafe road design or lack of maintenance contributed to the accident, a government entity may also bear liability.

Gathering Evidence to Prove Liability

In cases involving multiple parties, the foundation of a strong personal injury claim is the evidence gathered. At Gerstner Adam Law, we focus on collecting, preserving, and presenting evidence that clarifies each party’s role in the accident. This evidence may include:

  • Police accident reports that describe the scene and initial assessments of fault.

  • Witness statements that corroborate the sequence of events.

  • Photographs or videos from the scene, including dashcam or surveillance footage.

  • Vehicle damage assessments that help reconstruct the accident.

  • Expert testimony from accident reconstruction professionals.

  • Medical records documenting the extent and cause of injuries.

Each piece of evidence helps establish the connection between a party’s actions and the injuries suffered. In multi-party personal injury cases, small details often make a significant difference in how liability is apportioned.

The Importance of Accident Reconstruction

In accidents with several drivers, it’s often unclear who caused what portion of the damage. Accident reconstruction specialists can be invaluable in these cases. 

Using physical evidence, vehicle damage, skid marks, and other data, these experts recreate the accident to show how it unfolded. Their testimony can help a jury understand which driver or entity was primarily responsible.

Accident reconstruction is particularly important in Montana winters, where icy or snowy conditions often contribute to crashes. An expert can distinguish between unavoidable consequences of weather and negligent behavior, such as speeding, tailgating, or failing to maintain control. 

By clarifying these distinctions, we strengthen our clients’ personal injury claims and highlight the specific acts of negligence that caused their injuries.

Comparative Fault and Insurance Companies

Insurance companies play a significant role in multi-party accidents. Each insurer seeks to minimize its client’s share of liability, which can result in disputes between carriers. For injured parties, this means that insurance companies may attempt to shift blame or reduce payouts by exaggerating the plaintiff’s fault.

As attorneys practicing in Montana, we’re familiar with these tactics. In personal injury cases, we counter them by relying on thorough evidence collection and strong presentation of facts. By documenting injuries, damages, and the negligent conduct of each defendant, we reduce the likelihood that an insurer can unfairly shift liability.

How Courts Divide Liability

When a case proceeds to court, Montana law requires judges or juries to allocate liability among all parties. This process often involves weighing conflicting testimony, reviewing expert opinions, and assessing the credibility of witnesses. Courts must also apply the state’s comparative fault rule, reducing the plaintiff’s recovery if they share in the blame.

The division of liability isn’t always straightforward. For example, if three drivers contribute to a chain-reaction crash, one may be found 60% at fault, another 30%, and a third only 10%. 

The injured plaintiff may be one of these drivers or an innocent passenger. In each scenario, the recovery depends on the precise allocation of fault, making careful advocacy critical in personal injury cases.

Strategies for Strengthening a Claim

Over the years, we’ve developed strategies that improve the chances of success in multi-party auto accident claims. In personal injury cases, our focus is on thorough preparation and careful use of evidence. Some of the most effective strategies include:

  1. Promptly investigating the accident and preserving evidence.

  2. Identifying all potentially liable parties, including drivers, employers, manufacturers, and government entities.

  3. Consulting accident reconstruction specialists and medical professionals.

  4. Reviewing insurance policies to determine available coverage.

  5. Preparing for comparative fault arguments by gathering evidence that minimizes our client’s share of responsibility.

By following these strategies, we help clients pursue the maximum recovery available under Montana law.

Pitfalls to Avoid in Multi-Party Cases

Just as there are strategies that strengthen a case, there are also pitfalls that can weaken a personal injury claim. Some common mistakes include failing to identify all responsible parties, underestimating the impact of comparative fault, and accepting early settlement offers without fully understanding long-term damages.

Insurance companies may pressure injured parties to settle quickly, especially when multiple defendants are involved. However, accepting such offers often results in less compensation than the injured person is seeking. We caution clients to avoid signing anything before consulting with an attorney familiar with Montana personal injury law.

Damages Available in Multi-Party Accidents

Even in cases involving multiple defendants, the types of damages available remain consistent with other personal injury claims in Montana. Injured parties may seek compensation for medical expenses, lost wages, loss of earning capacity, pain and suffering, and property damage.

In cases of serious negligence or reckless behavior, punitive damages may also be available. For example, if one driver was intoxicated or a trucking company knowingly violated safety regulations, a court may impose punitive damages to punish and deter such conduct.

Reach Out Today

Proving liability in auto accidents involving multiple parties requires careful attention to detail, strong evidence, and knowledge of Montana’s comparative fault rules. At Gerstner Adam Law, we help clients secure the best possible outcome in personal injury cases. By gathering evidence, consulting experts, and countering insurance company tactics, we build strong cases that protect our clients’ rights and secure compensation. We’re proud to serve Billings, Montana, and the surrounding areas of Glendive, Miles City, and Sidney. Call today for a consultation.