What visual signal is used to indicate the location of a runway end?

The visual signal that indicates the location of a runway end consists of red lights. These lights are located at the ends of the runway to define the boundary and help pilots identify the end of the usable runway. When approaching from the runway side, these lights are a solid red, clearly indicating that the runway has been terminated and is not safe for continuing operations. This is particularly important for pilots during landing and takeoff to ensure they recognize the limits of the runway.

In contrast, white lights are typically used on the runway edges and centerlines, guiding pilots during takeoff and landing phases. The combination of red and white lights may be used in other contexts, such as approach lighting systems, but in this scenario, only red lights specifically indicate the runway end. Yellow lights play different roles, such as in taxiway markings, and are not related to marking the end of the runway.