Which lights are used to outline the edge of the runway during low visibility conditions?

Runway edge lights are specifically designed to define the lateral boundaries of the runway, especially under low visibility conditions. They provide essential visual guidance for pilots during takeoff and landing, ensuring that the edges of the runway are clearly visible. These lights are typically white, with different configurations indicating the runway's width and whether it's in use.

Other types of lights serve different purposes, such as beacon lights, which are used to indicate the location of an airport to pilots, particularly at night or in conditions of limited visibility. Taxiway lights are employed to illuminate taxiways and assist aircraft in navigating the area around the runway, but they do not outline the runway itself. Approach lights are designed to aid in the final approach to the runway but do not mark the edges of the runway. Thus, runway edge lights are the most suitable for outlining the runway during low visibility.