Traffic Accident Investigation Course

Lesson 1 • Introduction to Collision Causation Models

Presents foundational theories explaining how collisions occur through human, vehicle, and environmental factors. Prepares students to apply causal analysis in later chapters.

Lesson 2 • Types of Traffic Collisions

Classifies collisions by collision type, severity, and contributing factors. Provides a shared taxonomy used throughout the course.

Lesson 3 • Role of the Traffic Investigator

Defines the investigator's duties, authority, and ethical obligations at collision scenes. Establishes the professional baseline required for all subsequent fieldwork.

Lesson 1 • Scene Release and Handover Procedures

Outlines the criteria and process for releasing a scene to other parties. Ensures all investigative tasks are complete before control is relinquished.

Lesson 2 • Scene Perimeter and Traffic Control

Teaches methods for establishing and maintaining a controlled perimeter. Directly supports evidence preservation and public safety throughout the investigation.

Lesson 3 • Initial Scene Arrival Procedures

Covers the sequence of actions taken upon arriving at a collision scene. Establishes safe approach habits that protect investigators and preserve evidence.

Lesson 4 • Scene Preservation and Evidence Protection

Explains techniques for protecting physical evidence from contamination or loss. Bridges scene safety with the evidentiary integrity covered in later chapters.

Lesson 1 • Evidence Identification at the Scene

Trains students to recognise all categories of physical evidence relevant to traffic collisions. Builds the observational skills needed before collection begins.

Lesson 2 • Evidence Packaging and Chain of Custody

Covers proper packaging materials, labelling, and chain-of-custody documentation for all evidence types. Maintains admissibility from collection through court presentation.

Lesson 3 • Scene Photography and Videography

Establishes a systematic photographic protocol covering overview, mid-range, and close-up images. Visual documentation supports every subsequent analysis and courtroom presentation.

Lesson 4 • Measurement and Mapping Techniques

Introduces manual and instrument-based methods for accurately measuring scene geometry. Accurate measurements underpin all reconstruction work in later chapters.

Lesson 1 • Manual Drafting Methods

Teaches hand-drawn diagramming using graph paper, rulers, and protractors. Ensures students can produce diagrams when digital tools are unavailable.

Lesson 2 • Principles of Scaled Diagramming

Establishes the rules of scale, orientation, and symbology for collision diagrams. Provides the conceptual foundation before any drawing tool is introduced.

Lesson 3 • Diagram Quality Review and Testimony Preparation

Establishes a review checklist for accuracy, completeness, and clarity before submission. Prepares students to defend diagram methodology under cross-examination.

Lesson 4 • Computer-Aided Diagramming Software

Introduces purpose-built collision diagramming applications and their core functions. Digital diagrams produced here feed directly into reconstruction software used later.

Lesson 1 • Physics of Vehicle Motion

Reviews Newton's laws, friction, and energy concepts as applied to moving vehicles. Provides the mathematical foundation for all reconstruction calculations.

Lesson 2 • Speed Estimation from Skid Marks

Teaches the skid-to-stop formula and its variations for different surface conditions. Skid mark analysis is the most common speed estimation method in field investigations.

Lesson 3 • Reconstruction Software Applications

Introduces purpose-built reconstruction programmes for automating calculations and simulating collisions. Software outputs are validated against manual calculations from prior sections.

Lesson 4 • Energy Methods in Reconstruction

Uses work-energy principles to estimate speed from crush damage and post-impact travel. Provides an independent verification method for momentum-based results.

Lesson 1 • Perception-Reaction Time Analysis

Examines the stages of driver perception and reaction and their effect on stopping distance. Quantifies human delay as a measurable reconstruction variable.

Lesson 2 • Driver Behaviour and Decision Errors

Categorises common driver errors including misjudgement, inattention, and risk-taking. Provides a structured framework for attributing human causation.

Lesson 3 • Driver Impairment and Its Effects

Covers alcohol, drugs, fatigue, and distraction as performance-degrading factors. Connects impairment evidence to causal determination in the investigation.

Lesson 4 • Integrating Human Factors into Reports

Demonstrates how to incorporate human factors analysis into the formal investigation report. Ensures findings are expressed with appropriate scientific certainty.

Lesson 1 • Fatal Collision Investigation Procedures

Details the enhanced protocols, notifications, and documentation required for fatality investigations. Coordinates with medical examiners and prosecutors from the outset.

Lesson 2 • Multi-Vehicle and Chain-Reaction Crashes

Develops methods for sequencing events in crashes involving three or more vehicles. Requires mastery of momentum and energy methods from the reconstruction chapter.

Lesson 3 • Commercial Vehicle and Heavy Truck Incidents

Covers the unique dynamics, regulatory requirements, and data sources for commercial vehicle crashes. Heavy vehicle investigations require additional mechanical and regulatory knowledge.

Lesson 4 • Pedestrian and Cyclist Collision Investigation

Addresses unique evidence patterns and injury biomechanics in pedestrian and cyclist collisions. Requires integration of human factors and reconstruction skills from prior chapters.

Lesson 1 • Structure of the Investigation Report

Defines the required sections, logical flow, and formatting standards of a formal collision investigation report. A well-structured report is the primary deliverable of every investigation.

Lesson 2 • Direct Examination and Cross-Examination

Prepares students to present findings clearly on direct examination and withstand adversarial cross-examination. Effective testimony reinforces the credibility of the investigation.

Lesson 3 • Case File Management and Archiving

Establishes standards for organising, storing, and retrieving complete case files. Proper archiving supports future litigation, appeals, and quality audits.

Lesson 4 • Technical Writing for Investigators

Builds clear, precise, and objective writing skills suited to legal and technical audiences. Eliminates ambiguity that could undermine findings in court.