Highlighted terminology is explained at the bottom of the page.

Fundamental to those tasked with forming judgements on a road user's actions is their understanding of the geographical location of the collision or incident. The collision site (collision locus) holds a significant amount of information pertinent to forensic collision investigations and is one of the three main collision factors to explore.

When our clients first become aware of a large and catastrophic loss case, we strongly advise that they seek to secure all evidence. While we may not get access to the vehicles immediately while the police perform their examinations, we are able to attend and analyse the collision site. A timely site examination can identify evidence that is relevant to the collision, that may or may not have been identified during the on-scene investigation. During a timely collision site analysis we will locate any digital video evidence covering the collision sequence. We will observe and record traffic flow and and consider the collision environment; which concerns the settings, surroundings and conditions concerning a collision site at the time of a collision.

The collision environment is one of the primary collision factors we consider in all our investigations. The elements that make up the collision environment may include the road geometry, road profile, road alignment, signage, road structure, street lighting, sunlight azimuth and elevation, drainage, viewpoints, sightlines, approach paths, sources of distraction and weather to name only a few. In many cases, the collision environment plays little if any part in causing the collision, as most collisions are as a result of road user error. However, various collision environment factors may be contributory to the failure of a road user.

The vast majority of collisions occur on the road and taken as an entity itself, the road requires a thorough examination to determine its road condition and any defects which may have been a contributory or causative factor. The design of roads is regulated, and often the design manuals for specific local highways departments are available online, and we can compare these to any national guidance if required.

During a collision site analysis, we consider the visibility conditions for all road users relative to their respective approach paths during the pre-collision phase. When considering the visibility afforded to drivers on the approach to a hazard, we consider the difference between reduced visibility and obstructions; both partial and total. Obstructions range from fencing and hedgerows, through to building lines and the road geometry and road profile. When the view of a hazard is obstructed, either partially or totally, when it does come to be visible then it may appear suddenly without warning, with no looming up. The road geometry is unlikely to alter over the passage of time but any roadside objects may.

Any further analysis we perform may revolve around a road user's optical and colour resolution in relation to the collision environment. Although these factors tend to be specific to the collision scenario itself, there have been many occasions when the same or similar circumstances have been identified during collision site analysis. Furthermore, when glare is a potential source of road user disablement, it is advantageous to reattend the collision site when the sun is at the same azimuth and elevation, this is close to but not the same as reattending exactly one year after the collision date.

Of interest to our clients, is when the road geometry or signage has changed as a result of the collision. When a change is identified, we contact the associated highways agency or local council to determine the reasons behind the modifications.

From experience we have identified many issues, such as covered signage, poor road paint, significant bitumen deposits on junction approaches, severely reduced sightlines from signage and many others. Unless there is a full inspection from the eyes of an expert, there is a good possibility contributory factors will be missed.

We offer our clients varying levels of collision site analysis. Our clients who use this service have been rewarded with significant and evidentially robust findings such as carriageway defects, inadequate signage, confusing road geometry, conspicuity issues and obstructed sightlines to name a few.

Our UAV services offer a great way to capture and present the collision site from all different angles, and we can show road user approach paths from both aerial and in-vehicle views.

Ordinarily, a forensic collision investigator attends the collision site and reports on their findings having taken a few photographs and measurements. However, we strongly believe that a generic and limited approach is not objective enough for many of the collision scenarios, and so we offer additional enhancement services to our clients. The additional services are 3D laser scanning and UAV aerial imagery, and we strongly advise our clients to consider these when instructing our services.

We provide our clients with a fully customisable service and produce either a CPR-compliant or a non-disclosable collision site report.

Collision Site Analysis
Collision Site Analysis
Collision Site Analysis
Collision Site Analysis


Fees & Lead Times

Our service level agreements for fees and lead times for our collision site analysis 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.

Causative Factor - An event, circumstance or condition that causes a collision.

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

Collision Factor – An event, circumstance or condition relating to a collision scenario.

Collision Site - The geographical location of a collision scene.

Colour Resolution – The ability of an observer to resolve colour in an object in their field of view.

Conspicuity - The extent to which an object is discernible from its surroundings.

Contributory Factor - An event, circumstance or condition that contributes to a collision.

Forward Field of View (FFOV) – The extent of the observable world that a road user has looking forward at any particular moment.

Obstruction – A reduction, blockage or prevention of the available view of an observer due to the presence of something.

Optical Resolution – The ability of an observer to resolve detail in an object in their field of view.

Partial Obstruction - A reduction of the available view of an observer due to the hindrance of something.

Pre-Collision Scene – The area involving the collision-involved vehicles, objects or persons during their pre-collision phase.

Road Alignment – The top view (plan view) of the road geometry.

Road Condition – The status of maintenance and condition of a road surface.

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

Road Profile – The longitudinal side view of the road geometry.

Road Users – Persons on the road including drivers, vehicle riders, pedestrians or passengers.

Roadside Object – Natural or manufactured object at the roadside.

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

Total Obstruction - A complete loss of the available view of an observer due to something.

Visibility Conditions – Those that may possibly affect visibility for the driver.


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