Caught in the Act! Part Three

Mar 18, 2015

3D Laser Scanning – Determining & Illustrating Driver Eye View Obstructions:

In the reconstruction of vehicle accidents, particularly vehicle versus pedestrian cases, one of the issues that often arises is the portion of the scene that the pedestrian was visible to the driver in the moments immediately before impact. A common point of analysis is the so-called “Last Chance to Avoid” point for the driver of the vehicle. How much of the pedestrian, or other vehicle, was visible to the driver at this last chance point and position?

Often there are obstructions present to the drivers line of sight to the object impacted. These obstructions can be from objects in the environment outside the vehicle, such as telephone poles, street signs and foliage adjacent to the roadway and impact location. Other times the obstructions to the driver’s line of sight come directly from features within the vehicle itself. This is very common when commercial vehicles are involved. In a recent Bus vs. Pedestrian case, PSI devised a very accurate and repeatable method to determine and illustrate these obstructions. By utilizing 3D laser scan data and the 3D Working Model, it is possible to quantify the effect of these obstructions and illustrate how they impact the driver's view out on the roadway dynamically, as the objects and vehicles move over time towards impact.

In the recent case where a MUNI bus struck and injured the pedestrian crossing against the light, given the size and close proximity of the bus, (40 feet long, 8 feet wide, 8.5 feet high, the first vehicle in line and approximately 10 feet away when the pedestrian entered the street), it is certain that the bus was available to be seen by the pedestrian. However, the bus driver’s view towards the unexpected late crossing pedestrian is not as certain. The bus itself blocks the driver’s sight to portions of the roadway around the bus. The combination of these obstructions and the pedestrian’s 4’11” height may limit her visibility to the driver. Using the previously captured laser scan data, PSI created a 3D Working Model of the bus interior and driver’s eye position in order to analyze the issue.

Performing this task in the computer via the 3D Working Model has two distinct benefits: the precision and adjust-ability afforded by the computer and the ability to analyze it in context of the environment, derived motions and physical evidence of the virtual accident scene. Visualizing the results in connection with the accident reconstruction and signal timing elements allows a more detailed picture of the dynamic issues at play during the event. By modeling the bus interior and the driver’s eye position, the 3D Working Model creates visible geometry around the bus indicating which areas are not visible to the bus driver. By attaching this visible geometry to the 3D model of the bus as it moves, we can see the interplay between the line of sight obstructions and the position of the pedestrian as she crosses in front of the bus.


Read the Entire Case Study


Craig Fries


Craig Fries is the Founder and President of Precision Simulations, Inc., the foremost forensic analysis and animation firm in the US. In this role he has created or directed over 1,000 3D forensic animations for use in criminal and civil litigation and has maintained a 100% record of non-exclusion at trial. As a pioneer in the field of forensic laser scanning, Craig created the first 3D animation based upon laser scan data ever admitted at trial in the US, and has been at the forefront of the use of the technology in homicide and accident investigation since.

Add Pingback

Please add a comment

You must be logged in to leave a reply. Login »

Category List

Tag List

Muni Bus On-Board Camera System (1)
Litigation Declarations (1)
Analysis (1)
Laser Assisted Photogrammetry (2)
professional (1)
Animation over Video (1)
Crosswalk (1)
Ballistic Study (3)
Exhibits Foundation (1)
Surgical Animation (1)
scientific evidence (1)
2014 Annual Conference (1)
Sight Obstructions (1)
Trace back to shooter's location (1)
California Association of Criminalists (1)
body camera for deputies and officers (1)
infant death settlement (1)
Photometry (2)
Video Alignment (1)
Michael Brown (1)
Excellent Presentations (1)
Nieto (1)
Shooting (1)
First Degree Murder (1)
forensic expert (1)
Personal Injury (1)
9.75 million (1)
northern california chapter (1)
Seoul Korea (1)
Driver's Eye View Obstruction (3)
CA2RS (1)
South Lake Tahoe (1)
Officer Involved Shooting (3)
7 Days on Witness Stand (1)
Exemplar Life Sized Intersection (1)
Assault Rifle (2)
Fieldwork (1)
OIS (1)
Laser Scanning (3)
film (1)
Specific Calculations (1)
Variances (1)
evidence documentation (2)
largest infant death settlement in california (1)
Witness Testimony (1)
Nieto Verdict (1)
Expert's Preparation (1)
911 Call (1)
Expert Witness (3)
7.6 Mile Pursuit (1)
deposition (1)
Professional Association (1)
Medical (1)
Nighttime Video (2)
FEWA Secretary (1)
California District Attorneys Association (1)
.223 (1)
Reconstruction (1)
Eye (1)
Ballistics Analysis (5)
crash scene mapping (1)
3 (1)
forensic mapping (1)
Single Vehicle Accident (1)
California Association of Crime Lab Directors (1)
California Association of Accident Reconstruction Specialists (1)
3D Animation and Video Compositing (3)
Determine Driver's Eye View (2)
Incident and Exemplar Vehicles (1)
Radio Traffic (1)
animation (1)
GPS Analysis (1)
Construction Accident (1)
World Forensic Festival (1)
Construction Worker (1)
Plaintiff (2)
Video Analysis (2)
Autopsy Report (2)
CAC (1)
Bus vs. Pedestrian (1)
David vs. Goliath Case (1)
collaborative (1)
Video Capture Frame Rate (1)
Old Way vs Best Way (1)
Crosswalk in Shadow (1)
Side Bars (1)
News Van (1)
The Working Model (3)
Trajectory Rods (2)
3D Animation (10)
Error Analysis (1)
Trace Back Analysis (1)
Complete Analysis (1)
Guilty Verdict (1)
Ferguson MO (1)
AR15 (3)
Ohio vs Tensing (1)
Cross Examination (2)
CNN (1)
FEWA (1)
forensic consultant (1)
Capital Crime (1)
Ray Tensing (1)
Defense (2)
Expert's Analysis (1)
Visibility Studies (2)
seachao (1)
Reporter Injured (1)
CDAA Winter Conference (1)
3D crime scene mapping (2)
Power Line Wire Strike (1)
Explosion (1)
1000 Hours (1)
Accidental Shooting (1)
San Francisco Intersection (2)
reconstruction analysis (2)
Cone of Uncertainty (1)
Forensic Science International (1)
Operator Liability (1)
Visible Geometry (1)
Measurements (1)
nighttime visibility study (3)
Emergency Deployment Recorders (1)
ISO 17020 (1)
Camera Lense Distortion (1)
accident reconstruction (2)
Peer-Reviewed (2)
Physical Evidence (1)
Photogrammetry (3)
by eye (1)
New Forensic Technology (1)
Crush Analysis (1)
3D Working Model (18)
CalTrans (1)
Determine Degree of Error (1)
Shadow (1)
Body Camera (1)
Marco Topete Murder (2)
Laser Scan (4)
National News (1)
Nighttime Accident Reconstruction (2)
Criminalist (1)
Illustrate Driver's Eye View (1)
hot topic (1)
Sam Dubose (1)
Shadow Analysis (1)
Radio Traffic Audio (1)
Vehicle Crush Analysis (1)
TImeline from Audio (1)
Craig Fries (1)
Shooter's Location (1)
Driver's Eye Video (4)
Witness Stand (1)
Radiological (1)
Complex Accident Scene Reconstruction (3)
3D Laser Scanning (18)
3D Gunshot Wound Path Model (6)
Dr Judy Melinek (1)
Litigation (1)
3D Animation over Nighttime Video (2)
CDAA (1)
Trajectory (1)
Eye Witness (2)
Surgical (1)
911 Call Audio (1)
Objections (1)
Demonstrative Exhibits (1)
Forensic Expert Witness Association (1)
Ballistic Trajectory Analysis (7)
forensic (1)
Medical Animation (1)
CCSF (1)
402 Hearing (1)
Gunshot Wound Modeling (3)
Forensic Animation (1)
Downstream Benefits of 3D Laser Scanning (1)
Testimony (3)
Monte Carlo Method (1)
Vehicle 3D Laser Scan (1)
$84,000,000 Verdicts (1)
3d Visualization (6)
Wire Strike (1)
Mistrial (1)
Timing and Location of Evidence (1)
consultant (1)
.45 Caliber (1)
sacramento settlement (1)
Camera Lense Field of View (1)

Tag Cloud

Vehicle 3D Laser ScanAnimation over VideoTestimonyevidence documentationSeoul Koreasacramento settlementForensic Animation3D Laser ScanningBallistics AnalysisOISFEWA Secretarynorthern california chapterCalifornia Association of CriminalistsConstruction Worker.45 CaliberCraig FriesDr Judy MelinekDriver's Eye Videoscientific evidenceVisible GeometryVideo Capture Frame RateVideo AlignmentPhotometryTrajectory RodsProfessional AssociationDefenseOfficer Involved ShootingDetermine Degree of Error911 CallCone of Uncertainty9.75 millionPlaintiffMonte Carlo MethodMeasurementsExemplar Life Sized IntersectionCA2RSTImeline from AudioAutopsy Reportbody camera for deputies and officersSingle Vehicle Accident.223Accidental ShootingNieto VerdictForensic Expert Witness AssociationCriminalistCalifornia Association of Accident Reconstruction Specialistsinfant death settlementforensic expertPhysical EvidenceCamera Lense Field of Viewlargest infant death settlement in californiaNews VanDownstream Benefits of 3D Laser ScanningComplex Accident Scene ReconstructionLaser ScanNighttime Accident Reconstruction3D Animation over Nighttime Video$84,000,000 VerdictsCapital CrimeBallistic Trajectory Analysis402 HearingBody Camera3D Gunshot Wound Path ModelfilmSam DuboseExpert's Preparation2014 Annual ConferenceCNNforensic mappingCalTransISO 17020VariancesBus vs. PedestrianCross ExaminationCalifornia Association of Crime Lab Directorsreconstruction analysisprofessionalConstruction AccidentCalifornia District Attorneys AssociationDetermine Driver's Eye ViewFirst Degree MurderRadio TrafficComplete AnalysisMarco Topete MurderconsultantOld Way vs Best WayCACLDTrajectory3D Working ModelMuni Bus On-Board Camera SystemExplosionFEWAIncident and Exemplar Vehicles3New Forensic TechnologyObjectionscrash scene mappingNietoforensic consultantTrace back to shooter's locationTrace Back AnalysisExpert WitnessEyeNighttime VideoPersonal InjuryTiming and Location of EvidenceShootingOhio vs TensingforensicLaser Assisted PhotogrammetryDavid vs. Goliath CaseRadio Traffic AudiocollaborativeVehicle Crush AnalysisSan Francisco IntersectionanimationPhotogrammetry911 Call AudioDemonstrative ExhibitsMedical AnimationReporter InjuredRay TensingWitness StandPeer-ReviewedseachaoShooter's LocationFerguson MOCACNational NewsForensic Science InternationalCamera Lense DistortionAnalysisPower Line Wire StrikeMichael BrownGuilty VerdictWitness Testimony1000 HoursCrush AnalysisCCSFCDAA Winter ConferenceLitigation Declarations3D crime scene mappingAssault RifleWorld Forensic FestivalOperator LiabilitySide Barsby eyeReconstructionLitigationThe Working Model7 Days on Witness StandCrosswalk in Shadow3D Animation and Video CompositingMedicalIllustrate Driver's Eye ViewGunshot Wound ModelingDriver's Eye View ObstructionError AnalysisSurgical AnimationWire StrikeGPS AnalysisAR15Visibility StudiesExhibits FoundationSpecific CalculationsdepositionSight ObstructionsShadownighttime visibility studySurgicalShadow Analysis7.6 Mile PursuitFieldworkCrosswalkVideo Analysisaccident reconstruction3D AnimationEye WitnessExcellent PresentationsBallistic Study3d VisualizationRadiologicalLaser ScanningMistrialCDAAExpert's AnalysisEmergency Deployment RecordersSouth Lake Tahoehot topic