Crash Forensics, Occupant Kinematics and Accident Reconstruction

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Event Data Recorder / Crash Data Retrieval Services

Downloadable Documents


Why Crash Data Retrieval?

Event Data Recorders are your vehicles Black Box.  They provide information about the vehicle just prior to and after a collision.  This information can include:

  • Change in Velocity
  • Number of Occupants
  • Usage of Seatbelt 
  • Airbag Deployment
  • Steering Wheel Angle
  • Seat Position
  • Break Usage
  • Lights On/Off

What is an Crash Data Retrieval?

"What is CDR and EDR?

“CDR” is the acronym for Crash Data Retrieval used to describe the CDR Tool and “EDR” is the acronym for Event Data Recorder which is a function of the airbag control module (ACM). The CDR Tool is a commercially available system comprised of hardware and software that is currently used by law enforcement, collision reconstructionists, fleet managers and government researchers to access and “image” EDR data which may be stored in control modules found in passenger cars, light trucks and SUVs.

The airbag control module's potential capability to save data after a crash has caused some to mistakenly refer to it as an "event data recorder” or EDR and moreover the “black box”. In reality, the airbag control module's primary job is to detect sudden changes in direction and/or rotation and, when appropriate, deploy restraint devices like airbags. The ACM uses certain bits of information including that from crash sensing systems, seat belt related sensors and occupant detection systems to decide whether or not and when to deploy airbags and other restraint system devices. When certain conditions are met, the airbag control module may record data associated with these sudden changes in direction and/or rotation (i.e.  a crash) which can later be “imaged” by the CDR Tool." - The ACR Network