When you have been in an accident or any incident that could lead to a legal liability claim, your first instinct is to check on injuries and exchange information with the other driver or person directly involved. That is necessary, but it is not enough. There is a third group of people at almost every scene who can make or break your claim: witnesses. These are neutral bystanders who saw what happened and have no stake in the outcome. Failing to get their information at the scene is one of the most common and preventable mistakes people make. By the time you realize you need a witness, they are usually gone for good.

Witnesses provide something that neither you nor the other party can offer: an outside perspective. In any liability claim, the version of events from the people involved is automatically suspect because they have self-interest. You want to minimize your fault, the other party wants to minimize theirs, and the insurance adjuster or judge knows that. A witness has nothing to gain or lose. Their account carries far more weight because it is seen as objective. A single, clear, credible witness can turn a he-said-she-said situation into a slam-dunk case for you.

The problem is that most people do not think about witnesses while they are still at the scene. They are shaken up, worried about their car, their injuries, or getting the other driver’s insurance card. They assume that witnesses will come forward later if needed. That is a dangerous assumption. Witnesses are under no obligation to stay or to contact the police later. They have their own lives, their own schedules, and their own reasons not to get involved. If you do not approach them immediately and ask for their contact information, they will drive away or walk away within minutes. After that, finding them is nearly impossible. You might get lucky and have a police officer note a witness’s statement, but that is not guaranteed. Officers often focus on the involved parties and may not interview bystanders unless asked.

So what should you do? As soon as you have confirmed that everyone is safe and that emergency services have been called if needed, look around for anyone who was watching. This includes people in nearby parked cars, pedestrians, shop owners, delivery drivers, or even passengers in other vehicles who were not involved. Approach them calmly, explain that you are trying to get a clear picture of what happened, and ask if they saw the incident. If they say yes, ask for their full name, a phone number, and an email address. If they are willing, also ask for their home address or the address of their workplace, but do not pressure them—phone and email are usually enough. Write everything down on a piece of paper or type it into your phone immediately. Do not rely on your memory, because stress and adrenaline can blur details.

You also need to ask one simple question: “What exactly did you see?” Write down their response in their own words as much as possible. This does not mean you should interrogate them like a detective. Keep it short and straightforward. The goal is to capture a rough statement while the memory is fresh. It does not have to be a formal affidavit. Even a few sentences—“I saw the blue car run the red light and hit the white car that had the green”—can be invaluable later. If they are hesitant to give a written statement, just get their contact information and reassure them that you or your insurance company may call them later.

There is a common fear that witnesses will not cooperate. In reality, many people are willing to help, especially right after an incident when everyone is still present and emotions are raw. They want to make sure the truth comes out. The key is to ask immediately. Do not wait for the police to arrive. Do not wait until you have finished arguing with the other driver. Do not wait until you have called your lawyer. The witness may be gone by then. Approach them while they are still standing there, before they decide it is not their problem.

Also remember that witnesses are not limited to people who saw the collision itself. They can include people who saw events leading up to the incident, like aggressive driving or a sudden mechanical failure, or people who saw what happened immediately after, such as an exchange of words or a person acting erratically. Sometimes a witness saw the other driver on their phone right before the crash, which is a goldmine for a liability claim. You will not know what they saw unless you ask.

Exchanging information with witnesses is not just about getting names and numbers. It is about securing the evidence that will support your version of events when the other party’s story changes. It happens all the time. A week after the accident, the other driver tells their insurance company that you ran the stop sign. They claim you were speeding. They say you caused the crash. Without a witness, it becomes your word against theirs. With a witness, you have a third party who can testify to what really happened. That testimony can be the difference between a fair settlement and a denied claim.

This applies to all types of liability claims, not just car accidents. If you are in a slip and fall at a store, look for other customers who saw the wet floor. If you are hit by a falling object at a construction site, ask nearby workers or pedestrians who saw the incident. If you are injured in a dog attack, find neighbors who witnessed the dog’s previous aggressive behavior or who saw the attack happen. In every case, the principle is the same: the people who are not involved are your best allies. Do not let them walk away without getting their information.

One more practical tip: when you approach a witness, be polite and clear. Say something like, “Excuse me, I think you saw what just happened. Could I get your name and number? My insurance company may want to talk to you.” That is direct, honest, and non-confrontational. Most people will comply. If they refuse, accept it and move on. But do not assume they will refuse without asking.

At the end of the day, your claim is only as strong as the evidence you collect at the scene. You have no control over what the other party says later. You have no control over how the police write their report. But you do have control over whether you approach every witness within your reach and secure their information before they disappear. That small action, taken in the first few minutes after an incident, can save you months of stress and thousands of dollars. Do not let it slip away.