What Is an Affidavit in Truck Accident Cases?

In commercial trucking accident cases, the word affidavit comes up frequently — during investigations, insurance claims, and litigation. But many people aren't sure what an affidavit actually is, who creates one, or why it matters. Here's a plain explanation of how affidavits function in the context of truck accident cases.

What an Affidavit Is

An affidavit is a written statement of facts, made under oath, and signed in front of a notary public or other authorized official. The person signing it — called the affiant — swears or affirms that the contents are true to the best of their knowledge. Providing false information in an affidavit can constitute perjury, which is why these documents carry legal weight.

Affidavits are used across many areas of law, but in truck accident cases they serve a specific function: they allow individuals to put their version of events — or their knowledge of facts — into a sworn, documented form that can be used in insurance investigations, pre-litigation negotiations, and court proceedings.

Why Affidavits Matter More in Trucking Cases

Commercial trucking accidents differ from ordinary car crashes in important ways. They often involve:

• Multiple parties — the driver, the trucking company, cargo loaders, maintenance contractors, and their respective insurers
• Federal regulations — the Federal Motor Carrier Safety Administration (FMCSA) sets rules around driver hours, vehicle maintenance, load limits, and licensing
• Complex evidence — electronic logging devices (ELDs), black box data, driver qualification files, and maintenance records

Because so many parties may have competing interests, and because the damages in serious truck crashes tend to be significant, the factual record matters enormously. Affidavits help establish that record early and formally.

Who Typically Creates Affidavits in a Truck Accident Case

📋 Several different parties may produce affidavits at various stages:

In litigation, affidavits from expert witnesses are especially common. An accident reconstruction specialist might submit an affidavit explaining how the crash occurred based on physical evidence. A medical expert might attest to the long-term effects of a spinal injury. These sworn statements can support motions filed in court or be used during depositions.

Affidavits in the Insurance Claims Process

Before a case ever reaches a courtroom, affidavits may surface during the insurance investigation. A claims adjuster gathering facts about a commercial trucking accident might request sworn statements from witnesses or the parties involved. In some states, insurers have specific procedures for taking examinations under oath (EUO) — a more formal process that functions similarly to an affidavit but involves direct questioning.

An affidavit submitted during the claims phase can influence how fault is assessed. In states that use comparative negligence rules, the degree of fault assigned to each party affects how damages are calculated. A clear, consistent sworn statement that aligns with physical evidence carries more weight than an unsworn account.

How Affidavits Are Used in Litigation 🏛️

Once a truck accident case moves toward a lawsuit, affidavits become tools in the formal litigation process. Common uses include:

• Summary judgment motions — A party may submit affidavits to argue that there are no disputed facts and the case should be decided without a full trial
• Preliminary injunctions — If evidence needs to be preserved quickly (such as a truck's black box data), affidavits may support emergency court orders
• Discovery disputes — When parties disagree about what evidence must be shared, affidavits can document the scope of available records

It's worth noting that affidavits differ from depositions. A deposition involves live, recorded testimony under oath, with opposing attorneys able to ask questions. An affidavit is a one-sided written document — the affiant controls what's included, though they remain legally bound to accuracy.

The Variables That Shape How Affidavits Function

How affidavits are used — and how much weight they carry — depends on several factors:

• State procedural rules govern what forms affidavits must take, how they're notarized, and when they can be submitted in court
• Whether the case settles or goes to trial affects whether affidavits ever become central evidence
• The strength of other evidence (black box data, dashcam footage, ELD records) may make affidavit testimony more or less significant
• Whether FMCSA violations are alleged can expand the scope of facts that need to be established through sworn testimony
• Attorney involvement typically shapes when and how affidavits are prepared — an attorney representing either party will usually advise on the content and timing of any sworn statement

In some jurisdictions, there are also affidavit of merit requirements in personal injury cases involving professional negligence — though these are more common in medical malpractice than in trucking cases.

What This Means for Someone Involved in a Truck Accident

⚖️ If you've been in a crash involving a commercial truck, sworn statements — including your own — may become part of the evidentiary record sooner than you expect. The specific role affidavits play depends on your state's rules, how the claim is being handled, whether litigation has begun, and who the parties are.

Those details determine everything: what must be stated, by whom, in what form, and at what stage. General knowledge of what an affidavit is provides a foundation — but how it applies to any specific accident is a question shaped entirely by the facts of that situation.