Box Boxes and Accidents
Certainly everyone has heard the term 'data recorder' in reference to aircraft. They are electronic devices designed to either record instructions relayed to the electronic systems of the plane. There are also cockpit voice recorders that tape all conversations in the cockpit between crewmembers as well as other conversations and sounds. These recorders are invaluable if the need arises to reconstruct an accident.
More and more, today's automobiles and trucks are also coming equipped with an Event Data Recorder, which is designed to serve a purpose similar to that in a plane. In other words in the case of a vehicle collision the 'black box' can inform the accident reconstructionist of such valuable information as the speed at which the car or semi truck was traveling, whether or not the brakes were applied and the degree at which the accelerator was being pressed down.
In addition, it will indicate if seat belts were in use and if any warning lights were displayed.
The EDR (Event Data Recorder) may be engaged when air bags are deployed in the vehicle (but not always) and they provide the accident reconstructionist with over half a dozen pages of relevant information related to the crash. This data is retrieved by trained professionals and used in conjunction with other crash information to provide a complete picture of the car or truck accident.
While these data recorders will not prevent a wreck - the information it provides can be referenced for the future development of safety features that may prove valuable in years to come. Additionally, the data can be used in a lawsuit to determine speed, braking and other factors a jury may consider in finding fault for causing an accident.

