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Research comprises creative work undertaken on a systematic basis in order to increase the stock of knowledge, including knowledge of man, culture and society, and the use of this stock of knowledge to devise new applications. It is used to establish or confirm facts, reaffirm the results of previous work, solve new or existing problems, support theorems, or develop new theories. A research project may also be an expansion on past work in the field. To test the validity of instruments, procedures, or experiments, research may replicate elements of prior projects, or the project as a whole. - source wikipedia.org

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ARC-CSI Crash Conference

Join us in Nevada for the largest
crash conference of the year!
ARC-CSI Crash Conference

June 2-5, 2014


CDR User's Summit

Join us in Texas for the Crash Data
Retrieval User's Summit. This Summit brings together EDR/CDR professionals from all over the world to present on the newest technologies in CDR.
CDR User's Summit
January 26-28, 2015


Collision Magazine

Collision Magazine, the International Compendium for Crash Research is the top-rated print publication for accident reconstruction, traffic investigation, and crash research.
Collision Magazine


Bosch CDR Tool - Crash Data Retrieval

The CDR Tool is a commercially
available tool, allowing you to image crash data directly from all supported vehicles giving you a detailed report
of critical data parameters leading
up to and during a crash.
Crash Data Group

Accident Reconstruction Research: Crash Data Retrieval - CDR / EDR

What is CDR and EDR?

CDR Interface Module EDR Data“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.

>> Official Site of CDR


CDR and Evaluating Fraudulent Claims
posted October 2013

A new video from Crash Data Group that explains all about Crash Data Retrieval, EDR data, Airbag Control Modules (ACM) and how they all work when evaluating fraudulent claims. If you would like a copy of this video for training, please email your request to: arc@accidentreconstruction.com


What Gets Recorded and When Should You Image EDR Data?

Different make and model vehicles record different amounts of data and a different number of “events”. An “event” is a crash or other physical occurrence which causes a trigger threshold to be met or exceeded. Data from the collision is stored in the airbag control module as either a “non-deployment” event or a “deployment” event. You should ALWAYS image a supported vehicle even if the impact was so minor that an event was not recorded.

A non-deployment event is a sudden change in direction and/or rotation of the vehicle that “wakes-up” or “enables” the ACM but makes a decision not to deploy any of the safety restraints; for example, hard braking. On the other hand, you could have a deployment event. A deployment event is a sudden change in direction and/or rotation that “wakes up” or “enables” the ACM and is sufficient to warrant a command deployment.

Crash Data Retrieval How it works
Diagram of imaging an ACM

Some of the key data parameters that are recorded in the ACM are listed below and certain ACM types include up to 5 seconds (or more) of pre-crash data. With the CDR Tool you now have access to a physical, non-biased, representation of what the vehicle was doing 5 seconds prior to impact (typically recorded in 1 second intervals)!

Benefits of imaging vehicle crash data include:

  • Valuable crash evidence stored in the vehicle
  • Obtain pre-crash vehicle data
  • Obtain vehicle speed
  • Obtain delta-V (crash severity)
  • Obtain seat belt status
  • Obtain throttle position
  • Obtain brake status
  • Obtain ignition cycles
  • A proven track record of admissibility at trial 
  • and much more

When the vehicle data is imaged, using the CDR Tool, and used properly, it leads to a collection of data evidence that can be used for a multitude of information regarding a crash. If the data stored, is ignored and not imaged, it opens recontructionists and insurers to claims of bad faith and evidence spoliation. Always image the EDR data!


Currently used by private practice Collision Reconstuctionists and Traffic Investigators across North America

Crash Data RetrievalThe Bosch Crash Data Retrieval System is a proven tool that allows Collision Reconstructionists investigating vehicle crashes the opportunity to image crucial crash data parameters from a vehicle that has been in a crash. This crash data, which is stored in the vehicles airbag control module, may be used to make informed decisions about the crash based on the crash data "imaged" from the vehicle in question.

There is nothing to install, the event data recorder (EDR) functionality is already in most production vehicles today. Simply attach the correct CDR cable and image the vehicles crash data directly to your computer, then print a PDF version of the report. The Bosch Crash Data Retrieval System currently supports select GM, Ford, Chrysler, Honda/Acura, Nissan/Infiniti, Mazda, Fiat, Toyota/Lexus, Suzuki, BMW and Volvo vehicles.

For a complete listing of all vehicles covered by the Bosch Crash Data Retrieval System, simply download the vehicle coverage list.


Is the crash data obtained admissible at trial?

Yes. In more than 25 criminal and civil cases around the US, Crash Data Retrieval system recovered data has been admitted as evidence along with expert opinion over objection and after extensive admissibility hearing and challenges.


NHTSA 49 CFR Part 563 is here!

In August 2006, NHTSA published a final rule specifying uniform requirements for the accuracy, collection, storage, survivability, and retrievability of onboard motor vehicle crash event data in passenger cars and other light vehicles voluntarily equipped with event data recorders (EDRs). The final rule was intended to standardize the data collected through EDRs so that it could be put to the most effective future use.

Compliance Dates: Except as provided below, light vehicles manufactured on or after September 1, 2012 that are equipped with an EDR and manufacturers of those vehicles must comply with this rule. However, vehicles that are manufactured in two or more stages or that are altered are not required to comply with the rule until September 1, 2013. Voluntary compliance is permitted before that date.

Summary: By September 1, 2012 all vehicles manufactured and sold in North America must be in compliance and the crash data be accessible with a commercially available tool.

>> Read the ruling update


Bosch CDR Tool

The CDR Tool is an ever-expanding tool set for the accident reconstructionist, accident investigator, insurance claims adjuster, insurance SIUs, and many other industry professionals. The CDR Tool is commercially available for purchase through Crash Data Group, the exclusive distributor for North America.

For complete information on the Bosch CDR Tool and how it can be used for your business, please visit: www.cdr-system.com


CDR Experts and Trainers

If you are looking for a professional to image the EDR data from a vehicle or if you are looking for training on the Bosch CDR Tool please use the following links:


Privacy Concerns

Despite alerts and warnings in their vehicle owner's manual, many drivers are not aware of their vehicle's recording capability. Civil liberty and privacy groups have raised concerns about the implications of data recorders 'spying' on car users, particularly as the issue of 'who owns the data' has not yet been fully resolved, and there has been some controversy over the use of recorded data as evidence in court cases and for insurance claims against the driver of a crashed vehicle. But the use of EDR data in civil and criminal court cases is on the rise as they become more accepted as a source of reliable empirical evidence. There have been a number of trial cases in the US and internationally involving EDRs. Drivers have been both convicted and exonerated as a result of EDR evidence.

Not finding what you are looking for?

The ARC Network is continually searching the Internet and other data sources to bring you the most accurate and fresh data available. As we continually build this area of our web site we would like to hear your suggestions for research topics and helpful web site links. Simply contact us via email or phone and we will review your suggestions.

Join the ARC Network for access to additional research material

Members of the ARC Network have access to the members only portal web site that contains the following additional research information:

  • Vehicle Specifications Online Database
  • Crash Stiffness Online Database
  • Online Equation Solver
  • Motorcycle Specifications Online Database
  • Article Library

For more information about joining as a member of the ARC Network. Please visit the Membership Section.

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