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![Page 1: 1 EDR User Perspectives on Parameters & Data Accessibility: Independent Investigator/Consultant Accident Reconstruction Robert C. McElroy, Ph.D. Forensic.](https://reader035.fdocuments.in/reader035/viewer/2022062809/56649ec85503460f94bd4b17/html5/thumbnails/1.jpg)
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EDR User Perspectives on Parameters & Data
Accessibility: Independent Investigator/Consultant
Accident Reconstruction
EDR User Perspectives on Parameters & Data
Accessibility: Independent Investigator/Consultant
Accident Reconstruction
Robert C. McElroy, Ph.D.
Forensic Accident Investigations, Inc.
SAENational Transportation Safety Board
EDR Symposium June, 2003
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2 SAE
A Personal IntroductionA Personal Introduction
30+ years automotive industry– Former GM technical executive
NHTSA EDR groups participation SAE & IEEE EDR Committees ( 3 )
Consulting – EDR, vehicle technology, & accident reconstruction
Ph.D. – Texas A&M
PPV T&B
Industrial Engineering Statistics
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3 SAE
Accident ReconstructionAccident Reconstruction
Traffic Traffic Accident Reconstruction is the effort to determine, from whatever information is available, how the accident occurred.
Reconstruction is not determining why an accident happened.
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4 SAE
ExamplesExamples
““Ouch”Ouch”
ImpactImpactExample #1:Example #1: out & downout & down
Example #2:Example #2: impact &impact & final restfinal rest
out
Down
Final RestFinal Rest
Crash analysis can beCrash analysis can besimple or complex,simple or complex,with or without EDR.with or without EDR.
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5 SAE
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6 SAE
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7 SAE
Accident ReconstructionAccident Reconstruction
Traffic Traffic Accident Reconstruction is the effort to determine, from whatever information is available, how the accident occurred.
Reconstruction is not determining why an accident happened.
![Page 8: 1 EDR User Perspectives on Parameters & Data Accessibility: Independent Investigator/Consultant Accident Reconstruction Robert C. McElroy, Ph.D. Forensic.](https://reader035.fdocuments.in/reader035/viewer/2022062809/56649ec85503460f94bd4b17/html5/thumbnails/8.jpg)
8 SAE
EDR User Perspective IssuesEDR User Perspective Issues
Data ownership Vehicles with downloadable data Data retrieval Data interpretation Correlation of data sources Report findings Frye hearings
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9 SAE
Data Ownership ( simplified )Data Ownership ( simplified )
Owner / Driver of the Owner / Driver of the vehicle owns the datavehicle owns the data
Insurance company Insurance company rights to the datarights to the data
Manufacturer proprietary Manufacturer proprietary datadata
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10 SAE
Does Vehicle Have Data ?Does Vehicle Have Data ?
Age / ModelAge / ModelManufacturerManufacturerType of impactType of impact
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11 SAE
Direct connection to EDRDirect connection to EDROBD connector under the dashOBD connector under the dash
Data RetrievalData Retrieval
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12 SAE
Data InterpretationData Interpretation
Type of crashType of crash– Front / Side / Rear / Pedestrian / etc.Front / Side / Rear / Pedestrian / etc.
Pre crash eventsPre crash eventsDelta VDelta VVehicle integrityVehicle integrity
– Electrical / PhysicalElectrical / Physical
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13 SAE
Correlation of Data SourcesCorrelation of Data Sources
EDR dataEDR dataVehicle damage dataVehicle damage dataSite dataSite dataPre impact dataPre impact dataImpact dataImpact dataPost impact dataPost impact data
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14 SAE
Technology ChallengesTechnology Challenges
LED and HID lamps do not have visible post impact damage profiles like “hot shock”.
Drive by wire, steer by wire, brake by wire systems eliminate traditional technology which can be examined after a crash.
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15 SAE
Report FindingsReport Findings
Are analysis and results consistent ? ? ?
– ABS Skid Marks
– Electronic Controls
– Non-Filament Lamps
– Vehicle Damage
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16 SAE
Frye HearingFrye Hearing
Data admissibility in court.Data admissibility in court.
– Does this technology have validity Does this technology have validity which permits it to be accepted as which permits it to be accepted as evidence.evidence.
– NHTSA EDR Working Groups.NHTSA EDR Working Groups.
– History and development of EDR.History and development of EDR.
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Traffic Accident Reconstruction
Practical Examination
Traffic Accident Reconstruction
Practical Examination2 Test Examples
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18 SAE
Real World Example # 1EDR or Conventional Analysis ?
Real World Example # 1EDR or Conventional Analysis ?
But I was pushingon the brake
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19 SAE
Real World Example # 2Real World Example # 2
1
2
3
4
Basic Analysis
Truck Energy (1) =Car Energy (2+3+4)
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20 SAE
Real World Example # 2Real World Example # 2Vehicle 1 = Vehicles 2+3+4Vehicle 1 = Vehicles 2+3+4Real World Example # 2Real World Example # 2Vehicle 1 = Vehicles 2+3+4Vehicle 1 = Vehicles 2+3+4
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3
4
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21 SAE
EDR NeedsEDR Needs
Standardized light vehicle data set Standardized heavy vehicle data set Common connector system Common retrieval method
EDR “Policy”
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22 SAE
EDR “Policy” FoundationEDR “Policy” Foundation
NTSB identifies need for EDR NTSB Symposiums, #1, #2, & #3 NHTSA working groups, PPV + T&B NHTSA EDR Petition Review SAE & IEEE Committees
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23 SAE
EDR Policy SolutionEDR Policy Solution
Standardize data set
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24 SAE
EDR Policy Benefits To SocietyEDR Policy Benefits To Society
Save lives, Increase public confidence in
transportation system, Provides inherent accountability for
collision vehicles, and Reduces, to some extent, the
complexity of collision analysis.
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Questions & CommentsQuestions & Comments