Written by Short answer: Dashcam footage is some of the strongest evidence available in a Chicago car accident claim because it captures speed, lane position, traffic signal phase, and driver behavior in real time. If you have your own dashcam, download that footage immediately, most cameras overwrite in as little as one to three hours. If the other driver had a dashcam, rideshare camera, or if the crash occurred near a business or Chicago traffic camera, send a preservation letter within 48 hours. That window closes fast, and once footage is overwritten it is gone permanently.
In my experience handling Illinois personal injury cases, dashcam footage is the single piece of evidence that most reliably resolves liability disputes. Defense attorneys in car accident cases almost always argue that their client had the green light, was not speeding, or that the other driver cut them off. When footage contradicts that narrative, the case changes, often within days of production. Knowing how to locate, preserve, and use every category of footage is something every accident victim and their attorney needs to think about from the first hours after a crash.
Types of Footage Available in a Chicago Car Accident Case
Chicago is one of the most heavily surveilled cities in the country. Multiple overlapping camera systems may have recorded the moments before, during, and after a crash. The categories attorneys look for in every case include:
- Your own dashcam, The most immediately available footage. If you installed a forward-facing or dual-channel dashcam, the recording is on your SD card or in cloud storage right now. Download it to an external drive or upload it to cloud backup before the camera loop overwrites it.
- The other driver’s dashcam, Many drivers operate dashcams without advertising it. Under Illinois discovery rules, a preservation demand sent to the at-fault driver’s insurer within 48 hours creates a litigation hold obligation. Failure to preserve after that demand can result in an adverse inference instruction at trial.
- Business security cameras, Storefronts, gas stations, parking garages, banks, restaurants, and ATMs often have cameras that capture adjacent roadways. The coverage area is usually 30 to 100 feet from the building entrance. These cameras typically overwrite every 24 to 72 hours.
- Chicago OEMC traffic cameras, The Chicago Office of Emergency Management and Communications (OEMC) operates hundreds of traffic cameras across the city’s arterial network. Footage is obtainable via Freedom of Information Act (FOIA) request under 5 ILCS 140/. The retention window varies but is often as short as 30 days.
- Red-light cameras, Chicago operates red-light cameras at major intersections administered by IDOT and the Chicago Department of Transportation. These cameras record the moments around a signal phase and are obtainable via FOIA. Footage often shows whether a driver ran a red light or was in the intersection on a stale yellow.
- Rideshare vehicle cameras, Uber and Lyft vehicles operated by drivers who installed their own dashcams, or in some cases company-issued cameras, are another source. If you were injured in or by a rideshare vehicle, a litigation hold demand should go to both the driver and the TNC (Transportation Network Company) immediately.
- City bus and CTA cameras, CTA buses and rail platforms have onboard cameras. If the accident involved a CTA vehicle or occurred near a CTA facility, a FOIA or litigation hold must be sent to the Chicago Transit Authority, which is a governmental entity with shorter notice requirements.
The 48-Hour Window, Why Preservation Is the First Priority
Most dashcams record on a continuous loop. Once the storage card fills, the camera begins overwriting the oldest footage with new recordings. Depending on card size and video resolution, a full loop can happen in as little as one hour and as long as three to four hours for a standard 16 or 32 GB card. For business security cameras, the retention window is longer, typically 24 to 72 hours, but it is not indefinite.
The practical consequence: if you are involved in a serious accident, getting medical care is the first priority. The second, as soon as you or a family member can act, is footage preservation. For your own camera, that means manually downloading the file or locking the clip (most dashcams have a manual save function triggered by a button press). For third-party footage, that means contacting an attorney who can send a preservation demand the same day.
The 48-hour preservation window is the most time-sensitive deadline in a car accident case, more urgent than filing a lawsuit, more urgent than getting an expert. You can file suit for two years. You cannot recover footage that was overwritten yesterday. Every attorney I know who handles serious accident cases sends a preservation demand the same day they are retained. If you have not hired anyone yet, send a certified letter yourself to the at-fault driver’s insurer saying you intend to pursue a claim and demand they preserve all dashcam, surveillance, and telematics data from the involved vehicles. That letter creates an obligation.
How to Obtain Third-Party Footage
Obtaining footage held by someone other than you or the other driver requires a different approach depending on who controls it:
Business cameras: An attorney can send a preservation demand letter via certified mail and email. Before litigation is filed, the business is under no legal obligation to produce the footage, but the preservation demand creates exposure for spoliation if they destroy it after receiving notice. Once suit is filed, a subpoena duces tecum compels production.
Chicago OEMC traffic cameras: Submit a FOIA request to the City of Chicago Department of Law or OEMC directly. Under 5 ILCS 140/3, the City must respond within 5 business days (with possible extensions). Identify the intersection, date, time, and direction of travel in your request. Be specific, requests that are too broad are often denied or delayed.
Red-light camera footage: FOIA request to the Chicago Department of Transportation or IDOT depending on who administers that particular camera installation. Footage tied to a red-light camera violation citation may also be obtainable directly from the citation record.
Vehicle telematics data: Modern vehicles record event data (speed, braking, seatbelt status, throttle position) in the Event Data Recorder (EDR). An attorney can demand EDR download as part of a preservation letter. EDR data must be downloaded before the vehicle is repaired or totaled, insurance companies sometimes rush vehicle disposal to prevent this.
Dashcam Footage Types, How to Obtain Them, and What Each Proves
| Footage Type | How to Obtain | What It Can Prove |
|---|---|---|
| Your own dashcam | Download to external drive immediately; lock clip if camera supports it | Vehicle speed, lane position, signal phase, other driver’s behavior before impact |
| Other driver’s dashcam | Preservation demand to their insurer within 48 hours; subpoena after suit filed | At-fault driver’s speed, phone use, lane changes, failure to brake |
| Business security camera | Preservation demand letter; subpoena duces tecum after filing | Vehicle positions, point of impact, pedestrian behavior, post-crash movement |
| OEMC traffic camera | FOIA request to City of Chicago (5 ILCS 140/) | Vehicle trajectories, signal phase at exact moment, traffic conditions |
| Red-light camera | FOIA request to CDOT or IDOT; citation record if a violation was issued | Whether driver ran red light; speed through intersection; vehicle identification |
| Rideshare / TNC camera | Preservation demand to driver and TNC; subpoena after filing | Driver distraction, TNC dispatch records correlated with crash time |
| Vehicle EDR (black box) | Preservation demand before vehicle is disposed; expert download required | Pre-crash speed, brake application, throttle, seatbelt use, delta-v at impact |
Admissibility of Dashcam Footage in Illinois Courts
Dashcam footage is generally admissible in Illinois courts, but it must be properly authenticated before a court will admit it. Authentication requires establishing:
- Camera was functioning at the time of the recording, evidence that the camera was powered and recording normally, not malfunctioning or in standby mode.
- Footage has not been altered, chain of custody from download to production. Any editing, transcoding, or compression after download can be attacked as alteration. Save the raw file in original format.
- Timestamp accuracy, dashcam clocks are often set manually and may drift or be set incorrectly. Defense attorneys will challenge timestamps that do not align with other evidence. Expert testimony on timestamp reliability may be needed.
- Camera position and angle, the foundation witness must be able to testify about where the camera was mounted, the field of view, and whether the footage accurately depicts the scene.
Illinois Rules of Evidence Rule 901(a) requires authentication as a condition precedent to admission. A dashcam recording from the plaintiff’s own vehicle can be authenticated by the plaintiff. Third-party footage typically requires testimony from a records custodian or an affidavit of authenticity under Rule 902.
What Footage Actually Proves, and Its Limitations
At its best, dashcam footage eliminates the “he said / she said” problem entirely. I have seen cases where the at-fault driver gave a sworn statement that they had a green light, their own dashcam showed the light was clearly red, and the case resolved within two weeks of production. Footage is powerful because it does not depend on memory, is not subject to bias, and presents the jury with objective reality.
What footage can show: the exact position of vehicles relative to lane lines, whether a driver was braking in the seconds before impact, traffic signal phase, whether a turn signal was activated, and in some cases driver behavior inside the cab (phone in hand, head turned away from the road).
Limitations are also real. A forward-facing camera shows what is ahead, not what the at-fault driver was doing inside their vehicle. Camera angle matters enormously: a camera mounted low on the windshield may capture a different perspective than what the driver actually saw. Wide-angle lenses distort distance and speed perception. Defense experts frequently argue that video footage makes vehicles appear to be traveling faster or slower than they actually were. A reconstruction expert may be needed to correlate the video with measured distances and calculated speeds.
Frequently Asked Questions
Can I use footage from a dashcam I installed in a company vehicle?
Yes, but the footage may be owned by your employer rather than by you. If you were driving a company vehicle with an employer-installed camera at the time of a crash, the recording is company property. Your attorney can subpoena it from the employer. If you were using a personally owned dashcam in a company vehicle, that footage is yours to preserve and use.
What if the other driver’s dashcam footage is unfavorable to my case?
Illinois discovery is mutual, both sides are entitled to evidence that exists. If footage from the other driver’s camera is unfavorable, the defense will use it. The same is true in reverse. An attorney reviews all footage before making decisions about how to proceed, and unfavorable footage often still contains useful details about road conditions, visibility, and the other driver’s behavior before or after the crash.
How do I file a FOIA request for Chicago traffic camera footage?
FOIA requests for City of Chicago records go to the applicable department’s FOIA officer. For OEMC traffic camera footage, the request goes to the City’s Department of Law. Identify the intersection by street names, the date and approximate time, and the specific camera location if known. The City has 5 business days to respond under 5 ILCS 140/3, with a possible 5-day extension. Denials can be appealed to the Public Access Counselor at the Illinois Attorney General’s office.
Will a court penalize the other driver if they deleted their dashcam footage?
Potentially yes. Under Illinois spoliation doctrine, if a party destroys or fails to preserve evidence after receiving a preservation demand, the court may instruct the jury that it may draw an adverse inference, meaning the jury can assume the destroyed evidence would have been unfavorable to the party who destroyed it. The strength of the sanction depends on when the demand was received, whether destruction was intentional or accidental, and whether the evidence was unique or available through other sources.
How long does the City of Chicago keep traffic camera footage?
Retention varies by camera type and system. OEMC traffic monitoring cameras typically retain footage for 30 days or less before overwriting. Red-light camera footage associated with a citation may be retained longer as part of the citation record, but footage from non-citation events is often on a shorter cycle. This is why FOIA requests or legal holds must be initiated within the first week after a crash, not weeks later.
Authoritative Sources
- 5 ILCS 140/, Illinois Freedom of Information Act
- 625 ILCS 5/7-203, Illinois Vehicle Code, Financial Responsibility
- 735 ILCS 5/13-202, Personal Injury Statute of Limitations
- City of Chicago Office of Emergency Management and Communications
Related Illinois Injury Guides
- Illinois Minimum Auto Insurance and What It Means for Your Injury Claim
- Chicago Car Accident Lawyer, How to Handle Your Claim
- Illinois Statute of Limitations for Personal Injury Claims
- Pain and Suffering Damages in Illinois
If you were in a Chicago car accident and need help locating and preserving dashcam or traffic camera footage, contact Phillips Law Offices at (312) 346-4262 for a free consultation. We send preservation demands immediately upon retention and have experience obtaining footage from OEMC, CDOT, and private business cameras throughout the Chicago area.
