What is the purpose of Runway Edge Lights?

Runway edge lights serve a fundamental role in aviation, primarily to delineate the edges of the runway during both day and night conditions and in various weather scenarios. These lights are typically white and are positioned along the length of the runway to assist pilots in identifying the runway's boundaries.

When a pilot approaches a runway, especially in low visibility conditions, the presence of these lights is crucial for safely aligning and guiding the aircraft during takeoff and landing. The use of brightly visible edge lights enhances situational awareness, enabling pilots to maintain proper runway orientation.

The other options describe features or visual aids that may be relevant to runway operations but do not directly convey the specific function of runway edge lights as clearly as the correct answer does. Thus, identifying that runway edge lights are indeed the lights located on the edges of the runway accurately captures their primary purpose in aviation operations.