![]() Originally designed to improve air bag performance based on the severity of the collision, the event data recorder can tell traffic accident investigators about the car’s speed, engine RPMs, how far the accelerator pedal was pressed, if the brakes were applied, whether the driver’s seatbelt was buckle, whether passenger seatbelt was buckle, real mileage and what warning lights were on. ![]() In some ways similar to data recorders used on airplanes and trains, the car’s recorder springs into action as part of the air bag system. This data is not eraseable with normal commercial available diagnostic and can not be erased for investigation purposes. ![]() Some car and truck engines also have electronic control modules that will hold vehicle data that can be recovered following a crash or event. The recorder, a four-inch square metal box (airbag ECU), is currently installed in most recent vehicles. ![]() When a traffic crash reconstructionist wanted to know the speed of a car about 10 seconds before it crashed into the side of a school bus, he found that information, and more, in the car’s Event Data Recorder (EDR), a feature quickly becoming standard on all cars.
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