In which conditions are Runway Edge Lights utilized?

Runway Edge Lights are specifically designed to enhance visibility during periods of darkness or restricted visibility. Their primary function is to delineate the edges of the runway to assist pilots in safely navigating the airfield environment, especially when natural light is insufficient or when weather conditions such as fog, rain, or snow reduce visibility.

In contrast, while heavy air traffic may require more awareness and caution, it does not specifically necessitate the use of these lights. Similarly, clear weather does not require the use of lights for runway edge demarcation since conditions are usually visually adequate for pilots. Daytime operations also typically don’t rely on these lights unless visibility is compromised. Thus, the focus of runway edge lights is on ensuring safety during low visibility situations, making their role critical during darkness or adverse weather conditions.