Highlighted terminology is explained at the bottom of the page.

Computer simulations use impulse-momentum rigid body dynamic models to simulate collisions between vehicles and objects. Computer simulations, more accurately crash simulations, are used by all crash testing companies and vehicle manufacturers. Crash simulations first started in the 1970s, and although early simulations were primitive, they are now very advanced and correlate exceptionally well with the results of real-life testing. Nearly all complex engineering projects start as simulations so that all variables and design parameters can be verified and validated prior to construction and implementation.

Specific to forensic collision investigation, we compile all the data and evidence from the on-scene investigation to create a series of video imageries assembled into a scientifically accurate simulation from an objective analysis of the collision dynamics. We use the collision scene evidence, vehicle damage profiles, tyre marks, road geometry, collision environment, road scars and all other sources of information to create computer simulations that correlate with the physical evidence.

A key factor in the production and credibility of computer simulations is that the author is a forensic collision investigator who applies their knowledge and objective reconstruction of the collision sequence and collision dynamics to overlay and correlate the identified collision scene evidence. A collision investigator is unable to do the same level of complex modelling and to achieve an entirely objective reconstruction of the collision scenario and collision sequence without computer simulation.

Computer simulations allow the examination of variable influences on the overall dynamics through a time-distance based relationship. This is vital when objectively analysing another expert's reconstruction opinion.

Numerous technological industries use computer simulations to design and test future products; from fighter jets to commercial planes, formula one racing cars to passenger motorcars, bridges to skyscrapers, and so on. Computer simulations allow the use of complex, and industry approved mathematical algorithms to determine the dynamics of an incident or collision scenario.

When instructed, our computer simulations are visually enhanced for litigation in our forensic animation service.

We offer a range of computer simulation services to:

✅ Simulate multiple vehicle collisions.

✅ Simulate competitions of vehicle performance (racing).

✅ Simulate pedestrian, bicycle, and motorcycle collisions.

✅ Simulate collisions involving commercial vehicles.

✅ Simulate all manner of accidents involving the human body.

✅ Simulate human body impact simulations.

Computers simulations allow exploring of what-if scenarios and another expert's opinion. They can determine the collision sequence, approach paths and associated travel speeds. Computer simulations use many of the fundamental and more complex scientific principles that underpin reconstruction calculations.

We ensure that our computer simulations correlate with our objective analysis and expert opinion, and in order to ensure the integrity of all control inputs, are only produced by qualified forensic collision investigators.

To provide an objective analysis of a collision or other incident, we strongly advise all our clients to consider computer simulations when instructing our consultancy services.

Computer Simulations Collisions
Computer Simulations Collisions
Computer Simulations Collisions
Computer Simulations Collisions



"Reconstruction of 60º Front-to-Side Staged Collisions with the Virtual CRASH Software Application"

Author: Bob Scurlock, Ph.D., ACTAR (University of Florida, Department of Physics)

Abstract: Virtual CRASH software is an application primarily used for motor vehicle accident reconstruction. In this article, results from a series of Virtual CRASH simulated vehicle versus vehicle collisions from the Research Input for Computer Simulation of Automobile Collisions (RICSAC) test series are presented; in particular, this article documents simulation results from the RICSAC 1, 2, 6, and 7 oblique 60° front-to-side impact tests. Validation study submitted to the Accident Reconstruction Journal

"Simulations of Pedestrian Impact Collisions with Virtual CRASH 3 and Comparisons with IPTM Staged Tests"

Authors: Tony Becker, ACTAR, Mike Reade, CD, and Bob Scurlock, Ph.D., ACTAR (University of Florida, Department of Physics)

Abstract: In this article, we present results from a series of Virtual CRASH-based pedestrian impact simulations. We compare the results of these Virtual CRASH pedestrian impact simulations to data from pedestrian impact collisions staged at the Institute of Police Technology and Management. 

Source: Accident Reconstruction Journal, March/April 2016. Cornell University Library: arXiv:1512.00790.


Fees & Lead Times

Our service level agreements for fees and lead times for our computer simulation services vary due to the complexity of each case and any additional investigative services required.

This service is part of our all inclusive investigative reconstruction package.

Please contact us to discuss your requirements.



Approach Path – The geometric description of the course over ground of the collision-involved vehicles, objects or persons during the pre-collision phase.

Collision Dynamics – The forces and motions occurring during a collision due to the interaction and engagement of collision-involved vehicles, objects or persons.

Collision Environment - The settings, surroundings and conditions concerning a collision site at the time of a collision.

Collision Involved Vehicle – A vehicle directly related to a collision.

Collision Scenario – The circumstances of a collision.

Collision Scene Evidence – Evidence from the collision scene concerning the pre-collision and collision phases.

Collision Sequence – The chronological sequence of events involving the collision-involved vehicles, objects or persons.

Computer Simulation - The reproduction of the behaviour of a system using a computer to simulate the outcomes of a mathematical model.

Crash Simulation - A computer simulation to examine the level of safety of a vehicle and its occupants.

Impulse-Momentum - A relationship between the change in momentum of an object and the impulse applied to it.

Point of Impact – The place and time of the initial touching of the collision-involved vehicles, objects or persons.

Point of Rest – The place and time where the collision-involved vehicles, objects or persons come to rest.

Rigid Body - A non-deformable and continuous system of particles.

Road Geometry – The geometric design of roads concerned with the positioning of the physical elements of it according to standards and constraints.

Road Scar – A mark created on a road surface or ground following damage by a collision-involved vehicle or object.

Separation Path – The geometric description of the course over ground of the collision-involved vehicles, objects or persons from the point of last contact to the point of rest.

Sightline – A visual axis for a normally unobstructed line of sight between an observer and a subject of interest.

Travel Speed – The speed of a collision-involved vehicle before any collision-related events.

Tyre Mark – A trace mark caused by a tyre.

Vehicle Damage Profile – An analysis representing the extent of damage to a collision-involved vehicle.


our Services

All Inclusive Service Collision Accident

All-Inclusive Investigation

Collision Reconstruction Collision Accident

Investigative Reconstructions
Desktop Analysis Collision Accident

Desktop Analysis
Claim Validation

Claim Validations
Vehicle Examinations Collision Accident

Vehicle Examinations
Laser Scanning Collision Accident

3D Laser Scanning
Forensic Animations Collision Accident

Forensic Animations
CCTV Digital Video Analysis Collision Accident

Digital Video Analysis
Collision Site Analysis Collision Accident

Collision Site Analysis
UAV Collision Accident

UAV Aerial Imagery
Collision Accident Computer Simulations

Computer Simulations
Collision Accident Vehicle Forensics Infortainment

Vehicle Forensics
Collision Accident Crash Data Analysis

Crash Data Analysis
Collision Accident Light Bulb Analysis

Lamp Analysis
Collision Accident Seat Belts

Seat Belt Examinations
Incident Analysis

Incident Analysis
Collision Accident Photography

Site Photography
Collision Accident Scale Plan

Scale Plans
Collision Accident Report Validation

Report Confirmations