Skid marks and a crumpled bumper sit in plain view, ready for your phone camera. What the vehicle’s software detected, which driving mode was active, and what a remote operator said before impact may sit locked inside the car or on a corporate server you will never see.
This is no longer hypothetical. Robotaxis and driver-assistance systems share California roads every day, and with the state DMV tracking millions of autonomous miles driven annually by 2026, the records they generate can help establish what happened. Those records also sit on servers with retention schedules nobody publishes to crash victims, and identifying who holds each one before it is overwritten is the core ofKent Pincin’s autonomous vehicle liability practice. Here is the sequence for protecting evidence you cannot photograph.
The Seven-Step Autonomous Vehicle Crash Evidence Preservation Sequence
Work through the steps in order. The early ones protect your health and the visible record. The later ones follow the digital trail, and speed matters most once a proprietary system or company server is involved.
- Get Medical Care Before Investigating the Technology
- Safety first, evidence second. Get out of traffic and stay clear of the vehicle, because damaged components and high-voltage systems can remain dangerous after a crash. No photograph outranks an ambulance ride.
Once you receive treatment, document the visit. Keep the discharge paperwork and written follow-up instructions, and note your symptoms while they are fresh. Those records describe your condition at a specific moment. They do not, by themselves, establish liability or compensation.Report the Collision and Describe the Automation Carefully - Ask for a police response when the situation warrants one. Give the officer what you actually observed rather than what you assume, including the operator’s statements, an illuminated dashboard indicator, an empty driver’s seat, and a fleet logo on the door.
Write down the agency name and incident number, plus the responding officer’s name. Ask where and how you can request a copy of the report later.
NHTSA’s Standing General Order on Crash Reporting also requires specified manufacturers and operators to report certain crashes involving automated-driving or advanced driver-assistance systems.Photograph the Scene Before Vehicles or Debris Move - Photograph the scene before anything moves, if you can do so safely. Capture every side of each vehicle, including license plates and any fleet numbers painted on the bodywork.
Then capture the surrounding context. Photograph the traffic signal and lane markings. Note the weather and any road obstructions. Mark roughly where each witness stood, and combine wide establishing shots with close detail shots.
Preserve the original files with their metadata intact. Do not crop them or apply filters. Resaving a file can strip the timestamp and location data that may help authenticate a photograph.Capture Witness Details and Nearby Video Sources - Collect each witness’s name and phone number, along with a short note about what the person actually saw. Ask whether anyone recorded the collision or noticed whether someone was seated behind the wheel.
Then scan the area for cameras. Storefront systems and residential doorbells are obvious candidates, while parking-garage cameras, transit buses, and intersection systems often get overlooked.
Ask politely and act lawfully. Do not trespass or demand another person’s footage. At this stage, you are identifying possible sources rather than attempting to seize evidence.Record Every Clue About the Vehicle’s Operating Mode - If you cannot tell whether the car was driving itself, document everything that might settle the question later.
Photograph the dashboard and center display. Photograph the exterior sensor array and steering-wheel position, along with any warning message on the screen. Record fleet branding and any visible operator station.
Write down exact statements from anyone connected to the crash, identifying the speaker and time. That may include the driver or tow operator, and a fleet representative or police officer.
Document uncertainty as uncertainty. A driver-assistance feature does not make a car fully autonomous, so do not label it that way. Record what you observed and nothing more.Identify the Technical Records That May Exist - Modern vehicles generate multiple layers of data, and knowing what to look for helps you preserve the right information:
- You usually cannot extract proprietary logs yourself. Do not power-cycle the vehicle or attempt repairs, and do not sell or dispose of it before obtaining case-specific advice.Preserve Messages and Original Files
Keep the rideshare receipt and booking details. Save the trip map and the app messages. Keep emails and texts in the same folder as insurer letters and tow records. Add repair communications and any manufacturer notice.
Export or download files where the service allows it, but leave the original account data in place. Screenshots can supplement the originals, but they do not replace them.
Then make a backup copy on a separate device or in a secure cloud folder. Keep the original files unchanged.
How to Preserve Vehicle Event Data You Do Not Control
Saving your own photos and app records is preservation you control directly. Embedded vehicle data and server-side logs belong to someone else, and retaining those records requires a different process and timeline.
Preservation Is Different From Extraction
Photographing a car may take only a phone and a few minutes. Retrieving embedded or server-side data may require the owner’s consent, a qualified forensic professional, a written preservation request, or formal legal process. Even a well-sent request cannot guarantee the data still exists or will be produced.
Send Accurate Information Quickly
A useful preservation request identifies the incident precisely. Include the collision date and exact location. Add the license plate and the VIN if you lawfully have it. A fleet number or trip receipt can further identify the incident, and so can a police report number.
Identify the collision and ask that relevant records be retained. Include vehicle and account data, along with communications, maintenance files, and software histories.
Troubleshooting When the Vehicle or Mode Is Unclear
The Vehicle Belongs to a Rideshare or Robotaxi Fleet
Start with your own app. Save the ride receipt and trip ID, then note the pickup and drop-off points with their timestamps. Record the fleet unit number and license plate. Capture the in-app support thread and any remote-assistance contact or safety-driver identification you can observe.
Company-held records may also exist, though retention practices vary and some data may be overwritten quickly. These critical files often include:
- Dispatch data and precise route histories
- Remote-support communications and remote-operator interventions
- Vehicle maintenance logs and software-deployment records
- Internal fleet safety procedures and driver protocols
The California Department of Motor Vehicles publishes autonomous-vehicle collision reports. A public report may help identify the permit holder behind a vehicle, but it won’t include every underlying log. Treat it as a starting point, not a complete account.
Nobody Can Confirm Which Mode Was Active
Work from observations only. Record what the dashboard displayed and where each occupant sat. Note whether hands were on the steering wheel and whether warning tones sounded. Write down what company or police representatives said as accurately as possible.
If you cannot determine the operating mode, write mode unknown. Record every visible indicator and relevant statement without converting a suspicion into a factual claim.
The Vehicle Has Already Been Towed or Repaired
Record the tow company and storage location. Note the release date and repair facility, identify the insurer, and note who currently has custody of the vehicle.
Retain estimates and invoices. Keep intake photographs and scan reports with them, along with any communications about inspection or disposal.
Do not interfere with lawful towing or repairs. Document the chain of custody instead. Obtain case-specific advice before authorizing destructive testing or disposal, because some procedures can destroy the data you are trying to protect.
A Company Representative Contacts You
Preserve the caller’s name, company, phone number, and the exact time of the contact. Save any voicemail or written follow-up.
Avoid speculation and do not alter your records. Consider obtaining legal advice before consenting to an inspection, a release, or a recorded statement.
How a Lawyer Can Help Map the Evidence
Identify Who May Hold Each Record
The relevant data rarely lives in one place. The vehicle owner may hold some of it, while the manufacturer may hold other records. The automated-driving-system developer and its component suppliers may each possess a portion. An insurer or rideshare platform may also hold relevant information, and so may a repair facility or towing company.
A lawyer can help identify these custodians and describe each record specifically enough to support a preservation effort. Not every crash involves every party on that map.
Coordinate Technical and Legal Preservation
Counsel may work with appropriate specialists to inspect the vehicle and preserve available data. Documenting who handled the vehicle and when matters, as does distinguishing event-recorder information from proprietary automation logs.
What is available depends on who owns the vehicle and where the collision occurred. What data the system created matters just as much, and no lawyer can guarantee access to those records or prevent every deletion.
Keep the Digital Trail Intact
The principle behind all seven steps is consistent: preserve what you can see, and record what remains uncertain without dressing it up as fact. Act quickly when a company controls the evidence, because its retention period may be short or unknown.
Start by creating one folder. Add the untouched photo set, ride receipt, and police incident number. That simple record gives you a preserved account of the crash information within your control.
