Accident Reconstruction & Event Data Recorders Robert C. McElroy, Ph.D. www.ForensicAccident.Com
A Personal Introduction <ul><li>30+ years automotive experience. </li></ul><ul><ul><li>Automotive patents. </li></ul></ul>...
Presentation Overview <ul><li>Broad view of EDR </li></ul><ul><li>EDR - history </li></ul><ul><li>Analysis techniques - ex...
Surface Low-Altitude Mid-Altitude High-Altitude Space EDR Application In All Transportation Delivery   Levels Sub-Surface
EDR Event Notification & Monitoring Capability <ul><li>Transportation System </li></ul><ul><ul><li>Sub-Surface </li></ul><...
Applications EDR Equipment Receiver E-911 Organizations Insurance, OEM’s  Federal Government OHS, NHTSA, FBI, USCG, CDC, E...
Event Data Recorders (EDRs) <ul><li>What is an Event Data Recorder? </li></ul><ul><ul><li>1) record information related to...
Basic Definition :  “accident reconstruction” <ul><li>Figure out what happened, </li></ul><ul><li>based upon available dat...
Motor Vehicle Accident Reconstruction
Elements of TAR <ul><li>Speed analysis </li></ul><ul><li>Stopping distances </li></ul><ul><li>Reaction time </li></ul><ul>...
Accident Reconstruction -  Historic ELEMENTS Photograph Start Point Trajectory End Point
Accident Reconstruction -  Current ELEMENTS Photograph Start Point Trajectory End Point
Historical Analysis <ul><li>Skid marks, </li></ul><ul><li>Vehicle crush, </li></ul><ul><li>Tire type, </li></ul><ul><li>Ve...
Evidence Analysis Example #1 18’ chord  w/ 1’ offset Approach Turn & skid marks
Turn Radius & Critical Speed
Collision Analysis Diagram
Vehicle Damage = 37” Crush Ouch !! Evidence Analysis Example #2
POI to POR = 140’
Collision Analysis <ul><li>Car stopped at light </li></ul><ul><li>Locked rear wheels after impact </li></ul><ul><li>Road c...
Analysis Methods 43 to 45 MPH <ul><li>Slide-to-Stop </li></ul><ul><li>Calculation </li></ul>2) Crush Calculation
Minimum Data: No EDR Night Approach, Underride Impact Logging Road Evidence Analysis Example #3
 
End & Start of Impact
POI – Logging Tractor Trailer DOT Retro Reflective Tape Marker Lights
Frame Rail Impact Evidence transfer
Side Marker Light
? How Fast Was This Car Going ?
Historical Background -- or -- Could this have been an early example for The President’s Partnering Agenda ?
?
President George Bush Dr. Bob McElroy
Time between collisions:  400 ms  Rear-end collision Front-end collision Car to Car Collision Analysis Jan 13, 1953 Accele...
Tachograph Data Recorder EDR Example #1
How It Works Chart Paper on Clock Motor & Stylus
Analyze Scribe Lines
Electronic Tachograph EDR Example #2
 
 
 
Equipment
Crash Pulse  Time (msec) Delta-V (mph) 0 Increasing 0 20 150 100 80 60 40 120
GM EDR System Data EDR Example #3
Brake Pipe Failure
Accident Data Recorder EDR Example #4
 
EDR Tomorrow <ul><li>Multiple vehicle inputs and video that can be wirelessly transmitted. </li></ul><ul><li>Applications ...
 
EVENT
4) Vehicle Data Xxxx Xxxx Xxxx 2) Video - outside - inside 3) Travel Path 1) EVENT Advanced EDR System Components
A Final EDR Scenario <ul><li>Car at 40 mph through a school yard full of kids and the driver said: </li></ul><ul><li>“ I w...
EDR Benefit To Society The Real Bottom Line: Public confidence in and  integrity of  the transportation system.
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AA - Transportation Research Board 2003 PPT "Accident Reconstruciton & Event Data Recorders"

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Transportation Research Board presentation "Accident Reconstruction & Event Data Recorders" by Dr. Robert McElroy

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AA - Transportation Research Board 2003 PPT "Accident Reconstruciton & Event Data Recorders"

  1. 1. Accident Reconstruction & Event Data Recorders Robert C. McElroy, Ph.D. www.ForensicAccident.Com
  2. 2. A Personal Introduction <ul><li>30+ years automotive experience. </li></ul><ul><ul><li>Automotive patents. </li></ul></ul><ul><ul><li>Former GM technical executive. </li></ul></ul><ul><li>NHTSA EDR groups participation. </li></ul><ul><li>IEEE & SAE EDR Committees. </li></ul><ul><li>Consulting – EDR, vehicle technology, & collision analysis. </li></ul><ul><li>Ph.D. – Texas A&M </li></ul>PPV T&B Industrial Engineering Industrial Education
  3. 3. Presentation Overview <ul><li>Broad view of EDR </li></ul><ul><li>EDR - history </li></ul><ul><li>Analysis techniques - examples </li></ul><ul><li>Analysis with EDR - examples </li></ul><ul><li>Accident Reconstruction in the future </li></ul>
  4. 4. Surface Low-Altitude Mid-Altitude High-Altitude Space EDR Application In All Transportation Delivery Levels Sub-Surface
  5. 5. EDR Event Notification & Monitoring Capability <ul><li>Transportation System </li></ul><ul><ul><li>Sub-Surface </li></ul></ul><ul><ul><li>Surface </li></ul></ul><ul><ul><li>Air </li></ul></ul><ul><ul><li>Space </li></ul></ul><ul><li>Utilities </li></ul><ul><ul><li>Electric </li></ul></ul><ul><ul><li>Gas </li></ul></ul><ul><ul><li>Oil / Pipelines </li></ul></ul><ul><ul><li>Nuclear </li></ul></ul><ul><ul><li>Communication Networks </li></ul></ul><ul><ul><li>Satellites </li></ul></ul><ul><li>Infrastructure </li></ul><ul><ul><li>Bridges </li></ul></ul><ul><ul><li>Tunnels </li></ul></ul><ul><ul><li>Buildings </li></ul></ul><ul><ul><li>Subways / Rail </li></ul></ul><ul><li>Other </li></ul><ul><ul><li>Landmarks </li></ul></ul><ul><ul><li>Historic Places </li></ul></ul><ul><ul><li>Destination Points </li></ul></ul><ul><ul><li>Vaults (civilian, military, </li></ul></ul><ul><ul><li>government) </li></ul></ul>
  6. 6. Applications EDR Equipment Receiver E-911 Organizations Insurance, OEM’s Federal Government OHS, NHTSA, FBI, USCG, CDC, EPA, FDLE, FDA, CIA, FEMA, National Guard, FAA, FCC, FERC, FHA, NRC, DOD, NSA, NSC, Secret Service International UN, WHO, ARC, Interpol, Border Patrol, INS, Customs Community Agencies Police, Fire-Rescue, Hospitals, Schools, Business, Transit State Government FEMA, Reservists, Law Enforcement, Health, Media TV, Radio, Print Individual Driver Performance Assessment
  7. 7. Event Data Recorders (EDRs) <ul><li>What is an Event Data Recorder? </li></ul><ul><ul><li>1) record information related to event, </li></ul></ul><ul><ul><li>2) simple or complex, </li></ul></ul><ul><ul><li>3) airbag deployment data, </li></ul></ul><ul><ul><li>4) profound impact on: </li></ul></ul><ul><ul><ul><li>Technical analysis of collisions, and </li></ul></ul></ul><ul><ul><ul><li>Public confidence in transportation system. </li></ul></ul></ul>
  8. 8. Basic Definition : “accident reconstruction” <ul><li>Figure out what happened, </li></ul><ul><li>based upon available data. </li></ul>
  9. 9. Motor Vehicle Accident Reconstruction
  10. 10. Elements of TAR <ul><li>Speed analysis </li></ul><ul><li>Stopping distances </li></ul><ul><li>Reaction time </li></ul><ul><li>Lane change </li></ul><ul><li>Turning dynamics </li></ul><ul><li>Critical speed curve </li></ul><ul><li>Collision types </li></ul><ul><li>Photogrammetry </li></ul><ul><li>Delta “V” </li></ul><ul><li>Linear momentum </li></ul><ul><li>Damage analysis </li></ul><ul><li>Pedestrians </li></ul><ul><li>Motorcycles </li></ul><ul><li>Tire marks </li></ul><ul><li>Vehicle data </li></ul><ul><li>Scene data </li></ul>
  11. 11. Accident Reconstruction - Historic ELEMENTS Photograph Start Point Trajectory End Point
  12. 12. Accident Reconstruction - Current ELEMENTS Photograph Start Point Trajectory End Point
  13. 13. Historical Analysis <ul><li>Skid marks, </li></ul><ul><li>Vehicle crush, </li></ul><ul><li>Tire type, </li></ul><ul><li>Vehicle deformation, </li></ul><ul><li>Biomechanics, </li></ul><ul><li>Product performance . </li></ul>
  14. 14. Evidence Analysis Example #1 18’ chord w/ 1’ offset Approach Turn & skid marks
  15. 15. Turn Radius & Critical Speed
  16. 16. Collision Analysis Diagram
  17. 17. Vehicle Damage = 37” Crush Ouch !! Evidence Analysis Example #2
  18. 18. POI to POR = 140’
  19. 19. Collision Analysis <ul><li>Car stopped at light </li></ul><ul><li>Locked rear wheels after impact </li></ul><ul><li>Road coefficient of friction = .7 g </li></ul><ul><li>140’ POI to POR </li></ul>
  20. 20. Analysis Methods 43 to 45 MPH <ul><li>Slide-to-Stop </li></ul><ul><li>Calculation </li></ul>2) Crush Calculation
  21. 21. Minimum Data: No EDR Night Approach, Underride Impact Logging Road Evidence Analysis Example #3
  22. 23. End & Start of Impact
  23. 24. POI – Logging Tractor Trailer DOT Retro Reflective Tape Marker Lights
  24. 25. Frame Rail Impact Evidence transfer
  25. 26. Side Marker Light
  26. 27. ? How Fast Was This Car Going ?
  27. 28. Historical Background -- or -- Could this have been an early example for The President’s Partnering Agenda ?
  28. 29. ?
  29. 30. President George Bush Dr. Bob McElroy
  30. 31. Time between collisions: 400 ms Rear-end collision Front-end collision Car to Car Collision Analysis Jan 13, 1953 Accelerometer data from center car.
  31. 32. Tachograph Data Recorder EDR Example #1
  32. 33. How It Works Chart Paper on Clock Motor & Stylus
  33. 34. Analyze Scribe Lines
  34. 35. Electronic Tachograph EDR Example #2
  35. 39. Equipment
  36. 40. Crash Pulse Time (msec) Delta-V (mph) 0 Increasing 0 20 150 100 80 60 40 120
  37. 41. GM EDR System Data EDR Example #3
  38. 42. Brake Pipe Failure
  39. 43. Accident Data Recorder EDR Example #4
  40. 45. EDR Tomorrow <ul><li>Multiple vehicle inputs and video that can be wirelessly transmitted. </li></ul><ul><li>Applications across modes of transport. </li></ul>EDR Example #5
  41. 47. EVENT
  42. 48. 4) Vehicle Data Xxxx Xxxx Xxxx 2) Video - outside - inside 3) Travel Path 1) EVENT Advanced EDR System Components
  43. 49. A Final EDR Scenario <ul><li>Car at 40 mph through a school yard full of kids and the driver said: </li></ul><ul><li>“ I was pushing the pedal but the electrons did not activate the drive-by-wire brakes.” </li></ul>
  44. 50. EDR Benefit To Society The Real Bottom Line: Public confidence in and integrity of the transportation system.

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