Numerical Validation of the Pedestrian Crossing Speed Calculator (PCSC) using Finite Element Simulations

Benjamin Rubrecht, Christophe Bastien, Huw Davies, Richard Wellings, Brian Burnett

Research output: Contribution to journalArticle

5 Downloads (Pure)

Abstract

In fatal pedestrian to vehicle collisions, accident investigators must attempt to reconstruct events that led up to the collision to determine liability in a court of law. In the absence of suitable video footage, the vehicle speed is calculated using particle based throw distance calculators such as the Searle method. Until recently, no methods concentrated on the velocity of the crossing pedestrian, vital for determining responsibility. A new approach, the Pedestrian Crossing Speed Calculator (PCSC), which uses evidence left on the bonnet and windscreen along with pedestrian anthropometry to calculate a pedestrian crossing speed, has been proposed in a previous research, and validated against three real accidents where the pedestrian approach was orthogonal to the vehicle. The range of application of the PCSC theory is investigated in this paper. This study has considered 48 Finite Element simulations to further validate the PCSC against a saloon type and SUV vehicles. In the case of the saloon type, the PCSC theory for a pedestrian crossing approach angle <10°, i.e. a pedestrian crossing trajectory no longer perpendicular to the vehicle trajectory, has been fully vindicated. The study has also confirmed the PCSC hypothesis stating that for saloon vehicles the relationship between and increase in bonnet dent width was caused by an increase in pedestrian gait angle. The study also concluded that the PCSC theory was less conclusive in the case of SUV collisions.This paper confirms that PCSC is unique and can have an important role in the field of accident reconstruction and for law enforcement; with the potential to determine vehicle speeds from a known pedestrian crossing speed, which will allow the calculation of the vehicle velocity in the absence of physical evidence left on the road surface.
Original languageEnglish
Article numberGJFSM-19-RA-525
Number of pages11
JournalGlobal Journal of Forensic Science & Medicine forensic
Volume1
Issue number4
Publication statusPublished - 1 Aug 2019

Fingerprint

Crosswalks
Accidents
Trajectories
Anthropometry
Windshields
Law enforcement

Bibliographical note

This work is licensed under Creative Commons Attribution 4.0 License CC-BY

Keywords

  • Accident reconstruction
  • Human model
  • pedestrian safety
  • pedestrian
  • PCSC
  • THUMS

Cite this

Numerical Validation of the Pedestrian Crossing Speed Calculator (PCSC) using Finite Element Simulations. / Rubrecht, Benjamin; Bastien, Christophe; Davies, Huw; Wellings, Richard; Burnett, Brian.

In: Global Journal of Forensic Science & Medicine forensic, Vol. 1, No. 4, GJFSM-19-RA-525, 01.08.2019.

Research output: Contribution to journalArticle

@article{e434864cb4d84cea83cbbf8ec8dbaa1c,
title = "Numerical Validation of the Pedestrian Crossing Speed Calculator (PCSC) using Finite Element Simulations",
abstract = "In fatal pedestrian to vehicle collisions, accident investigators must attempt to reconstruct events that led up to the collision to determine liability in a court of law. In the absence of suitable video footage, the vehicle speed is calculated using particle based throw distance calculators such as the Searle method. Until recently, no methods concentrated on the velocity of the crossing pedestrian, vital for determining responsibility. A new approach, the Pedestrian Crossing Speed Calculator (PCSC), which uses evidence left on the bonnet and windscreen along with pedestrian anthropometry to calculate a pedestrian crossing speed, has been proposed in a previous research, and validated against three real accidents where the pedestrian approach was orthogonal to the vehicle. The range of application of the PCSC theory is investigated in this paper. This study has considered 48 Finite Element simulations to further validate the PCSC against a saloon type and SUV vehicles. In the case of the saloon type, the PCSC theory for a pedestrian crossing approach angle <10°, i.e. a pedestrian crossing trajectory no longer perpendicular to the vehicle trajectory, has been fully vindicated. The study has also confirmed the PCSC hypothesis stating that for saloon vehicles the relationship between and increase in bonnet dent width was caused by an increase in pedestrian gait angle. The study also concluded that the PCSC theory was less conclusive in the case of SUV collisions.This paper confirms that PCSC is unique and can have an important role in the field of accident reconstruction and for law enforcement; with the potential to determine vehicle speeds from a known pedestrian crossing speed, which will allow the calculation of the vehicle velocity in the absence of physical evidence left on the road surface.",
keywords = "Accident reconstruction, Human model, pedestrian safety, pedestrian, PCSC, THUMS",
author = "Benjamin Rubrecht and Christophe Bastien and Huw Davies and Richard Wellings and Brian Burnett",
note = "This work is licensed under Creative Commons Attribution 4.0 License CC-BY",
year = "2019",
month = "8",
day = "1",
language = "English",
volume = "1",
journal = "Global Journal of Forensic Science & Medicine forensic",
number = "4",

}

TY - JOUR

T1 - Numerical Validation of the Pedestrian Crossing Speed Calculator (PCSC) using Finite Element Simulations

AU - Rubrecht, Benjamin

AU - Bastien, Christophe

AU - Davies, Huw

AU - Wellings, Richard

AU - Burnett, Brian

N1 - This work is licensed under Creative Commons Attribution 4.0 License CC-BY

PY - 2019/8/1

Y1 - 2019/8/1

N2 - In fatal pedestrian to vehicle collisions, accident investigators must attempt to reconstruct events that led up to the collision to determine liability in a court of law. In the absence of suitable video footage, the vehicle speed is calculated using particle based throw distance calculators such as the Searle method. Until recently, no methods concentrated on the velocity of the crossing pedestrian, vital for determining responsibility. A new approach, the Pedestrian Crossing Speed Calculator (PCSC), which uses evidence left on the bonnet and windscreen along with pedestrian anthropometry to calculate a pedestrian crossing speed, has been proposed in a previous research, and validated against three real accidents where the pedestrian approach was orthogonal to the vehicle. The range of application of the PCSC theory is investigated in this paper. This study has considered 48 Finite Element simulations to further validate the PCSC against a saloon type and SUV vehicles. In the case of the saloon type, the PCSC theory for a pedestrian crossing approach angle <10°, i.e. a pedestrian crossing trajectory no longer perpendicular to the vehicle trajectory, has been fully vindicated. The study has also confirmed the PCSC hypothesis stating that for saloon vehicles the relationship between and increase in bonnet dent width was caused by an increase in pedestrian gait angle. The study also concluded that the PCSC theory was less conclusive in the case of SUV collisions.This paper confirms that PCSC is unique and can have an important role in the field of accident reconstruction and for law enforcement; with the potential to determine vehicle speeds from a known pedestrian crossing speed, which will allow the calculation of the vehicle velocity in the absence of physical evidence left on the road surface.

AB - In fatal pedestrian to vehicle collisions, accident investigators must attempt to reconstruct events that led up to the collision to determine liability in a court of law. In the absence of suitable video footage, the vehicle speed is calculated using particle based throw distance calculators such as the Searle method. Until recently, no methods concentrated on the velocity of the crossing pedestrian, vital for determining responsibility. A new approach, the Pedestrian Crossing Speed Calculator (PCSC), which uses evidence left on the bonnet and windscreen along with pedestrian anthropometry to calculate a pedestrian crossing speed, has been proposed in a previous research, and validated against three real accidents where the pedestrian approach was orthogonal to the vehicle. The range of application of the PCSC theory is investigated in this paper. This study has considered 48 Finite Element simulations to further validate the PCSC against a saloon type and SUV vehicles. In the case of the saloon type, the PCSC theory for a pedestrian crossing approach angle <10°, i.e. a pedestrian crossing trajectory no longer perpendicular to the vehicle trajectory, has been fully vindicated. The study has also confirmed the PCSC hypothesis stating that for saloon vehicles the relationship between and increase in bonnet dent width was caused by an increase in pedestrian gait angle. The study also concluded that the PCSC theory was less conclusive in the case of SUV collisions.This paper confirms that PCSC is unique and can have an important role in the field of accident reconstruction and for law enforcement; with the potential to determine vehicle speeds from a known pedestrian crossing speed, which will allow the calculation of the vehicle velocity in the absence of physical evidence left on the road surface.

KW - Accident reconstruction

KW - Human model

KW - pedestrian safety

KW - pedestrian

KW - PCSC

KW - THUMS

M3 - Article

VL - 1

JO - Global Journal of Forensic Science & Medicine forensic

JF - Global Journal of Forensic Science & Medicine forensic

IS - 4

M1 - GJFSM-19-RA-525

ER -