What are the two main categories of serious events in collision analysis?

The classification of serious events in collision analysis into pre-scene events and on-scene events is crucial for understanding the sequence of occurrences leading to a collision. Pre-scene events refer to those actions or conditions that happen before the actual collision takes place—these could include factors such as driver decisions, vehicle preparation, or road conditions that may have contributed to the scenario. On-scene events involve the circumstances and actions that occur at the moment of the collision, such as the impact dynamics, maneuvers taken by the drivers, and immediate reactions.

This categorization is essential for thorough collision investigation, as it allows for a systematic approach to identify causative factors before and during the event, which can lead to improved prevention strategies. Analyzing both categories helps investigators establish a comprehensive understanding of how collisions occur and what preventive measures can be devised to enhance roadway safety.