Crash Reconstruction: A Complete Step-by-Step Procedure. Terry D. Day, P.E. Engineering Dynamics Corporation
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1 Crash Reconstruction: A Complete Step-by-Step Procedure Terry D. Day, P.E. Engineering Dynamics Corporation
2 Intersection Crash Reconstruction from Cradle to Grave Instructor: Terry D. Day, P.E. Engineering Dynamics Corporation
3 Outline Description of Crash Required Physical Data Police Accident Report Data Development Data Reduction Analysis Conclusions Discussion
4 Description of Crash Not a Real Crash MSU GOAL: Present a Procedure Not to Present a Case Study
5 Description of Crash Small, Rural Town 90-degree Intersection Relatively Level 4 Lanes (2 in each direction) 2 Vehicles (Passenger Cars) Stop Signs
6 Questions to Address Cause Vehicle Speeds? Inattention? Failing to Stop? Avoidability What If?
7 Required Physical Data Impact Speed Position at Impact Position at Rest Path between Impact and Rest Wheel Lockups (Drag Factor) Damage Profile Required for Collinear Collision Optional for Oblique Collision
8 Required Physical Data Begin Braking Speed Impact Speed (previous slide) Position at Begin Braking 13 ft of faint tire marks (ABS) Pre-impact Wheel Lockups (drag factor)
9 Police Accident Report Basic Scene Information General Location Rest Positions Crash-related Artifacts Skidmarks Gouge marks Glass Basic Vehicle Information Make/Model/Year Witness Statements Limited Emphasis
10
11 Vehicle Inspection Make/Model/Year/Body Style Dimensions/Inertias Wheel Damage/Lockups Damage Profiles Documentation Photographs Other Notes/Observations
12 Site Inspection Location/Direction Street Dimensions Skid/Scuff/Gouge Locations Surface Irregularities Survey Documentation Origin Photographs Other Notes/Observations
13 Data Reduction Vehicle Models Environment Model Crash-related Artifacts
14 Vehicle Model Dimensions Exterior Wheel Locations wrt CG Weight/Rotational Inertia Tires Friction Cornering Stiffness
15 Environment Model To Scale! Driving Surfaces with Skids/Scuffs/Gouges Sidewalks Buildings (vision obstructions) Stop Signs
16 Analysis Reconstruction Speed Estimates Simulation Confirm Speed Estimates Time-Distance Study Perception/Reaction Time Cause/Avoidability
17 Reconstruction Damage Analysis Crown Victoria Only Result: Speed Estimate Impact with Brick Building
18
19 Reconstruction Position at Begin Braking Crown Victoria Only Positions at Impact Positions at Rest Wheel Lockups Results: Speed Estimates Begin Braking Impact Separation
20
21 Simulation Initial Positions Driver Controls Steering Braking Throttle Wheel Impact Damage Results: Confirmation of Initial Speeds Time-Distance Study
22
23 Perception/Reaction Time Initial Visibility Position Time Begin Braking Position Time Difference is Maximum Perception/Reaction Time T P/R (max) = T Begin Braking T Initial Visibility
24 Result
25
26 Result Initial Visibility Time = 1.32 sec Position (to be used later) Crown Vic X = -73.2, Y = 20.0 Impala X = 18.0, Y = 97.4 Begin Braking Time = 2.52 sec So: T P/R (max) = = 1.20 sec
27 Observations Typical Perception/Reaction times 0.75 sec for Reaction Time Test 1.25 sec, min (lots of sources) 2.50 sec, max (AASHTO)
28 Conclusion Inattention Not a Factor Also Time at Begin Steering = 1.52 Driver began steering almost instantly (0.20 sec after initial vis) Driver was probably watching for cross traffic
29 Was Speed a Factor? Crown Victoria Speed = 40 mph Speed Limit = 25 mph To Find Answer: Position vehicles at initial visibility (from earlier result) Crown Vic X = -73.2, Y = 20.0 Impala X = 18.0, Y = 97.4 Reduce speed from 40 to 25 No steering/braking Re-execute
30 Result
31
32 Result At 25 mph, Crown Victoria passes behind Impala Misses by 25 ft Speed was a factor
33 Additional Information Did Impala Stop? To Find Answer: Position vehicle at stop line Accelerate at WOT to impact point Compare speed with impact speed
34 Result
35
36 Result Speed = 24 mph (less than impact speed, 35 mph) Impala did not stop at stop sign
37 Conclusions 1. Crown Victoria was exceeding the speed limit 2. Collision does not occur if Crown Victoria obeys the speed limit 3. Although collision is avoided, it is a near-miss 4. Impala did not have sufficient room to pull out safely 5. Impala did not stop
38 Discussion/Questions
39 Intersection Crash Reconstruction from Cradle to Grave Thank You Engineering Dynamics Corporation
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