After a crash, the footage on your dash cam can vanish in a few ways: the camera overwrites it, a card fills up, power cuts out, or you simply do not know how to save it. Save the clip before you leave the scene if you can, and certainly the same day. Most dash cams record in a loop, which means the oldest files are overwritten first, and a clip that is not protected will eventually be erased.
This article covers what to do in the hours after an accident, what the law says about keeping evidence, and what we cannot tell you: what your insurer will accept. That varies by company and policy, and we found no source that would let us say anything general about it, so we will not.
At the scene
- Make everyone safe and call emergency services if anyone is hurt. Footage comes later.
- Leave the camera running if it is still working, then press the lock or event button if it has one. Many models protect a file this way so loop recording cannot overwrite it.
- Photograph the scene, plates and damage with your phone. The dash cam is one source, not the only one.
- When you can, stop the recording and take the card out before it records over the aftermath. Keep the card somewhere safe.
How event protection works
Dash cams with an impact sensor lock the clip when they detect a collision. Garmin’s manual for its 47, 57 and 67W models states the default is to save 15 seconds of video before and after an event, stamped with time, date and location. Other makers have different defaults, so read your own manual and do not assume 15 seconds. A short clip may miss what led to the crash, such as a car running a light a half-minute earlier. If your camera lets you change the length, think about that setting before you need it.
Impact sensors are not perfect. A minor tap in a parking lot may not exceed the threshold, and a camera without power in the moment records nothing at all. For parked cases, see our piece on parking mode and hardwire kits, which covers keeping a camera powered when the car is off.
Copy first, then protect the original
Once home, make two copies of the files to a computer and ideally a second drive or cloud folder, before you do anything else. Do not edit, trim, rename or compress the original; keep it exactly as recorded. If you need a short clip to send to someone, create it from a copy and keep the original untouched. Write down when the crash happened, when you pulled the card and where it has been since. A sentence or two is enough.
Check that the files play, and that the date and time stamp are correct. A clock that is wrong by an hour or off by a daylight saving change is a small problem in an explanation and a bigger one in a dispute. Our article on dash cam video as court evidence covers how footage is authenticated and challenged.
Why you should not delete anything
If a claim could turn into a lawsuit, you may have a duty to preserve relevant material. The Federal Rules of Civil Procedure, rule 37(e), deals with electronically stored information that should have been preserved in anticipation or conduct of litigation and is lost because a party failed to take reasonable steps, when it cannot be restored or replaced. On a finding of prejudice to another party, the court may order measures no greater than necessary to cure it. Only on a finding that the party acted with intent to deprive the other party of the information may a court presume the lost information was unfavorable, instruct the jury that it may or must do so, or dismiss the action or enter default judgment.
That is federal civil procedure. Most car-crash disputes are handled in state court and by insurers, where the rules differ, and the point stands as a principle: a video you erased can be held against you, and a video you kept can be used to help you. If you are unsure, keep everything.
Your own footage can hurt you
Footage shows what happened, not who is right. If the clip shows you speeding or on your phone, it can be used against you, and you cannot pick the parts you like. Deleting the clip after a bad crash is the worst of the available options. Talk to an attorney before you hand a recording to anyone beyond the police.
Giving it to others
The police will ask for it if there was a report. Your insurer may ask for it. We cannot say what any insurer accepts, how fast, or whether a clip changes the outcome of a claim; that depends on the company and on your policy, so ask yours directly and keep the answer in writing. Give a copy, not your only original. If the other driver or their insurer asks for footage, you can say that you will provide it through your insurer or an attorney.
One more point: audio. Many dash cams record the cabin, which can pick up conversations of passengers. State laws on recording conversations differ, and our article on whether dash cams are legal covers the basics.
Memory cards wear out
A card in a dash cam is written to constantly, and cards for that use are sold as high-endurance for that reason. A worn card can fail without warning, and the clip you needed may be unreadable. Format the card in the camera on the schedule your manual recommends, and replace it before it fails. Check a recent clip every month or so; a camera that has quietly stopped recording is the most common way to have no footage when you need it.
What else to capture
The video shows the road in front, and sometimes behind. It does not show who stopped to help, what the other driver said, or the damage after the vehicles moved. Take the other driver’s name, plate and insurance details, and get contact details for witnesses. Photograph skid marks, traffic signs and signals, and the position of the cars before they are moved if it is safe to do so. A dash cam clip combined with these gives an adjuster or a lawyer something to work with, and covers the gap if the clip turns out to be unusable.
If the camera was not running, say so honestly when asked. Nobody can make you produce footage that does not exist, and a claim that it was recording when it was not is the kind of statement that does damage later.
Behind this review
TrueSpyTech does not operate a test lab, and no article here rests on a unit we plugged in ourselves. Research pulls the spec sheets and the relevant law, the pattern in owner reports fills in what a spec sheet will not admit, and an editor signs off before anything goes live. Ratings are locked before affiliate links go in, never after. The full protocol is on our How we review page.
Google lets you pick which sites come up first in your own results.
