What is the primary purpose of categories A, B, C, and D in runway incursions?

The primary purpose of categories A, B, C, and D in runway incursions is to determine the severity of potential collisions. These categories help aviation authorities classify and analyze runway incursion events based on their potential risk and the consequences that could arise from them.

Category A incidents represent the most severe situations where a collision was narrowly avoided, while Category D incidents are generally less severe, involving close calls that did not result in any significant risk of collision. This system allows for a structured approach to risk assessment, enabling the aviation community to implement targeted safety measures, train personnel effectively, and improve runway safety protocols. Understanding these categories is crucial for enhancing visibility into the factors that contribute to runway incursions and for promoting a safer airport environment.