What is the primary purpose of white runway edge lights at an aerodrome?

The primary purpose of white runway edge lights at an aerodrome is to mark the runway edge. These lights are crucial for providing clear visual delineation of the runway's boundaries, particularly at night or in conditions of low visibility. By marking the edges, they help pilots maintain proper alignment and prevent an inadvertent excursion off the runway, which is especially important during takeoff and landing phases of flight.

While indicating runway length, providing visual guidance during takeoff, and enhancing landing visibility are essential elements of airport operations, these functions are not the primary role of the white edge lights. The edge lights serve a specific function in creating a safe operational environment for pilots navigating the runway. Thus, understanding this purpose is vital for situational awareness during flight operations.