Black Boxes: The Secrets Your Vehicle Keeps

By Brian Butler

Many do not realize modern vehicles are always ready to record critical driving information. As with airplanes, most passenger vehicles are now equipped with Event Data Recorders (EDR), or “Black Boxes.” This information may be critical after an accident to show what happened, and who was at fault.

EDRs may record pre-event data for five seconds before and one second after an accident, possibly including vehicle speed, engine speed, percent throttle, change in velocity, and whether the brakes were applied. The make and model of the vehicle will determine what data is available. If you want this data, you must act quickly because it will be “overwritten” at some point if the vehicle continues in use.

It is also important to retain a competent expert to download the data. In Laborde v. Shelter Mutual Insurance Co., 82 So. 3rd 1237 (La. 3/9/2011), the trial court excluded the printout of data downloaded from a Black Box because of the boxes “chain of custody” and the method the information downloaded.  It is important that your legal team knows how to obtain and preserve this evidence.

Data from Black Boxes can be useful in many ways. In some cases, it may help to prove that the accident involved a low impact or to show that no brakes were applied. In other cases, it may harm your position, but the data is almost always relevant. There are costs in downloading and interpreting the data. But in the right case, the secrets kept in the Black Box may be the only way to reveal the truth.

Brian has been doing defense work for the last 28 years. He has handled all types of defense matters over his career, but in recent years his practice has been focused in serious injury or damage cases and has worked extensively with experts involving complex cases, fire cases, and forensic work. 

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