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.

SiteLines.jpg

Read the Entire Case Study



Category:

Craig Fries

user_avatar

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

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

Tag Cloud

by eyeAnalysisOld Way vs Best Waycrash scene mappingLitigationISO 17020Nieto VerdictCACLDCACCalifornia Association of Accident Reconstruction SpecialistsLaser ScanTrajectory Rodsconsultantinfant death settlementTiming and Location of EvidenceConstruction AccidentCCSFPeer-ReviewedCDAA Winter ConferenceVariancesOperator LiabilityPhysical EvidenceMeasurementsRadiologicalShootingFieldworkMonte Carlo Method3D Animation and Video CompositingPhotometryDemonstrative ExhibitsIllustrate Driver's Eye ViewOfficer Involved ShootingFEWA Secretaryaccident reconstructioncollaborativeCalifornia District Attorneys Associationhot topicnighttime visibility studyCross Examination3D Animation over Nighttime VideofilmCrosswalk in Shadowdeposition911 Call Audio.223Exhibits FoundationBallistic StudyCrush AnalysisCamera Lense Field of ViewDriver's Eye View Obstruction402 HearingForensic Science International3D Working Model3d VisualizationNighttime Accident Reconstruction9.75 millionCalifornia Association of Crime Lab Directors3D Laser ScanningDr Judy MelinekNighttime VideoExpert WitnessShadowThe Working ModelMedical AnimationCA2RSAnimation over VideoVideo AlignmentDetermine Driver's Eye ViewSpecific CalculationsPower Line Wire StrikeExpert's PreparationCriminalistBus vs. PedestrianAR15Trace Back Analysis1000 HoursReporter InjuredCDAACNNforensic expertTImeline from AudioDownstream Benefits of 3D Laser ScanningGunshot Wound ModelingMistrialReconstructionExplosionSurgicalForensic Expert Witness Associationnorthern california chapterPhotogrammetryRadio Traffic Audiolargest infant death settlement in californiaseachaoGuilty VerdictShooter's LocationSide BarsVisibility StudiesCapital Crimesacramento settlementWitness Stand3D AnimationTrace back to shooter's locationAutopsy Reportforensic consultantEye WitnessProfessional AssociationComplete AnalysisAssault RifleError AnalysisFEWALaser Assisted PhotogrammetryOhio vs TensingSight Obstructionsforensic mappingCraig FriesRay TensingRadio TrafficNew Forensic TechnologyOISEyeConstruction WorkerWorld Forensic FestivalMedicalGPS Analysis3D crime scene mappingDavid vs. Goliath CaseDefenseAccidental ShootingCrosswalkLitigation DeclarationsSan Francisco IntersectionforensicEmergency Deployment Recorders911 Call2014 Annual ConferenceComplex Accident Scene Reconstruction3D Gunshot Wound Path ModelExcellent Presentationsbody camera for deputies and officersreconstruction analysis7 Days on Witness StandPersonal InjuryVehicle 3D Laser ScanTestimonyLaser ScanningNational NewsSeoul KoreaVisible Geometry.45 CaliberFerguson MOExemplar Life Sized IntersectionBallistic Trajectory AnalysisTrajectorySam DuboseFirst Degree MurderForensic Animation7.6 Mile PursuitWitness Testimonyscientific evidenceCalTransevidence documentationNieto$84,000,000 VerdictsSingle Vehicle Accident3Body CameraVehicle Crush AnalysisDetermine Degree of ErrorPlaintiffExpert's AnalysisVideo AnalysisCalifornia Association of CriminalistsprofessionalIncident and Exemplar VehiclesVideo Capture Frame RateSurgical AnimationShadow AnalysisNews VanCamera Lense DistortionMuni Bus On-Board Camera SystemCone of UncertaintyBallistics AnalysisWire StrikeMarco Topete MurderanimationSouth Lake TahoeMichael BrownDriver's Eye VideoObjections


Archive