What is the main function of a runway safety area (RSA)?

The main function of a runway safety area (RSA) is to provide a buffer for aircraft in case of an overrun or incident. The RSA is a designated area surrounding the runway that is free of obstacles and designed to enhance safety by giving pilots a space to recover if they stray off the runway during takeoff or landing. This area is critically important as it reduces the risk of injury to both passengers and crew during an unintentional runway excursion.

Unlike other functions that might be associated with airport operations, such as accommodating additional parking or managing noise levels, the primary purpose of the RSA is directly linked to safety during flight operations. Additionally, the RSA does not specifically cater to visual guidance enhancements for pilots; that function is typically served by other airport infrastructure, such as lights and markings.