109 MPH Crash, Collision Magazine Article, msmac3D Recon

Decided this might be a good time to add a specific topic on Electronic Data Recorders (EDR) and/or Crash Data Recorders (CDR)
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109 MPH Crash, Collision Magazine Article, msmac3D Recon

Post by MSI »

  • NOTE: FIREFOX ISSUE: IF WHEN YOU CLICK PLAY YOU SEE ONLY A CIRCLE (NO VIDEO), FIXED: see link for information if you have similar issue.)
Dec 2023: Here is a draft copy of the article: Dec 2023 NOTE: We'll be presenting topics related to this paper and much more at:
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We did a quick Crash Reconstruction with msmac3D of a 109 MPH Crash documented in Collision Magazine, Vol 15, Issue2
The following is from the published paper by McHenry
  • "Investigation of EDR Data from A High Speed Crash with 3D Simulation" Collision Magazine, Vol 16, Issue 1 :
  • Introduction
    • Volume 15, Issue 2 of Collision Magazine contains a case problem article entitled "Did you find any errors when you read through the data?" by W. R. Rusty Haight & David W. Sersen.

      The case problem documents a real-world crash, captured in part on video, where both involved vehicles have similar, nearly identical data sets. Both vehicles had EDRs (Electronic Data Recorders). Both vehicles were General Motors (GM) vehicles, both are "49CFR563 compliant" in terms of the data sets recorded. They are from the same direct to module (D2M) cable family (the "F00K108454" D2M cable family of GM ACMs). The data translation reports for both are almost identical including much of the Data Limitations text. The most significant difference is the actual module variant. One vehicle – a 2013 Buick LaCrosse (Allure) – had what is identified as an "SDM10P-conti" airbag control module (ACM). The other involved vehicle, a 2017 Chevy Tahoe, had an ACM identified as a "SDM30-delphi."

      The first reason for a review of the case problem is the fact that the crash had some EDR (Electronic Data Recorder) anomalies, documented in the article, which demonstrate and caution that EDRs are not infallible, and you always must use caution when reviewing the EDR results. EDR data and information provide additional data for crash reconstruction which needs to be carefully analyzed in concert with other analyses and examinations to come to final conclusions on each individual crash reconstruction.

      The article brought up many important issues which need to be considered and addressed when reconstructing a crash with one, or two, EDRs. EDRs tell part of the reconstruction story…they are a great additional piece of the crash reconstruction puzzle however they can and do have issues/failures and don't tell you everything you need to know about a crash. The referenced article included possibilities for corruption or inadequacy of the EDR data due to proximity of the EDR to the crush zone (does it possibly move during the crash?), collisions wherein the accelerations on vehicles may exceed the limitations of the maximum acceleration which can be recorded by the EDR (many have 50 g-unit limits which represent an approximation of the actual limit) and there are other items which also need to be considered.

      A second reason for interest in the subject crash is that although one vehicle was at an extremely high speed (>100 MPH closing speed), the combined speed is like what might be encountered in 2 lane at-speed highway crashes so the anomalies brought up in the article are applicable to many highway crashes.
Below are initial comparisons of EDR accelerations and DeltaV calculations with preliminary msmac3D results.
look for our upcoming paper in the next issue of Collision Magazine
  • Investigation of EDR Data from a High-Speed Crash with 3D Simulation
    Brian G. McHenry, McHenry Software
With a presentation of comparison results and discussion of evaluation of the EDR data, etc.
stay tuned!
Tahoe EDR msmac3D Comparison.jpg
Buick EDR msmac3D comparison.jpg
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