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An automotive event data recorder (EDR), commonly referred to as a black box, is a device installed on most passenger vehicles that is usually a function of the airbag control module. It records from two to 25 seconds of collision-related data that may help determine speed, braking activity, stopping distance, impact severity, occupant kinematics, steering, avoidance measures, number and sequence of collisions, seat belt usage, airbag deployment, and more. The devices are designed to store data following airbag deployment, and non-deployment events where the change of velocity (Delta V) of the event is severe enough to “wake up” the system (usually 2-4 mph).

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