What is the Role of a Truck’s Black Box (Event Data Recorder) in an Accident Investigation?

The role of an event recorder in an accident investigation is critical. I have an expert that I can call up on any accident case and send him out there to do the download. The download will record the last five events that have happened on that truck or that car. We can figure out the speed that the truck was going, the car was going, how long it took them to stop, whether the brakes were working correctly—any number of things that are critical in determining fault.