Tab #2 Elements of a Traffic Crash Elements of Investigation Interview Techniques.
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Transcript of Tab #2 Elements of a Traffic Crash Elements of Investigation Interview Techniques.
Tab #2
Elements of a Traffic CrashElements of Investigation
Interview Techniques
Possible Perception and Perception
Scanning Ahead to Identify Hazards
Possible Perception- Limited by Highway
Geometry
Possible Perception & Perception-Limited by
Topography
Encroachmentinto an adjacent lane
Start of Evasive Action
Initial Contact and Maximum Engagement
Distributed
Concentrated
Maximum Engagement
Final Rest
Classify by
How the Vehicle Arrived at Its Final Resting
Point
Elements of Investigation: “H-V-E”
Factors and Conditions Relating to the Crash…
Before Crash
DuringCrash
AfterCrash
Human
Vehicle
Environ- ment
BehaviorCondition ImpairmentPassenger(s)
Occupant MotionSeat belt usage?
Behavior
Personal InjuryPassenger InjuryDriver Interview
Human Factors
A Focus on the Role that Humans HaveDrivers and passengersWitnessesResponse personnel
Human Factors
Focus on the Driver and Passenger Identification and contact information Basic Review of Incident Injuries Received What alerted them to the impending
crash
Human Factors
Focus on Independent Witnesses Identification and contact information What they saw Where were they when they saw the
crash What alerted them to the collision Any relationship to accident
participants
Human Factors
Focus on Response Personnel Fire Department EMS Personnel Law Enforcement Personnel Motor Carrier Enforcement Personnel Tow truck drivers News Media (photojournalists, TV)
Vehicle Factors
Factors and Conditions Relating to the Crash…
Before Crash
DuringCrash
AfterCrash
Human
Vehicle
Environ- ment
Angle of ImpactSpeed at Impact
Position at Impact
Vehicle DesignPre-trip
InspectionLoad Securement
Exterior DamageInterior DamageOccupant EjectionFinal Rest
Vehicle
Vehicle dimensions, specifications, equipment and loadVehicle damage Direct or contact Indirect or induced Undamaged areas
Vehicle mechanical condition
Vehicle Damage – Impact Angle
Vehicle Damage – PDOF and Overlap
Vehicle Damage – Occupant PDOF
Vehicle Condition – Loading
Environmental Factors
Environment
Focuses on the general area where the crash occurredIncludes the physical evidence at the scene that was created prior to and from the collisionIncludes the highway geometryIncludes the weather conditions
Factors and Conditions Relating to the Crash…
Before Crash
DuringCrash
AfterCrash
Human
Vehicle
Environ- ment
Damage to RoadImpact Location
Direction of Travel
Highway DesignSurface
ConditionTime of DayTraffic Control
Dev.
Physical EvidenceDebris
Tire MarksGouges
Environment – Physical Evidence
Environment – Physical Evidence
Environment – Highway Geometry
Documenting Highway Geometry
Lane and shoulder Widths
Grade
Curvature
Cross-slope
Hwy Fixtures
Surface Condition
TrafficControl Devices
Land Use
Topography
Surface Type
Environment – Weather Conditions
How far could you see?
Environment- Road Surface Condition
Document the presence of snow, snow-pack, ice and evidence of sand/salt/plowing activities on the highway.
Interviewing
Prepare for the Interview Outline or Script Areas of Questions Identify the “who, what, when, where and
how” questions that you will be asking
Listen During the Interview