What color are the lights used along the edge of the runway?

The lights used along the edge of the runway are white. This color designation is standardized in aviation to ensure that pilots and ground personnel can easily identify the boundary of the runway. White lights serve to delineate the edges clearly, especially during nighttime operations or low-visibility conditions.

Using white lights along the runway edge is crucial for maintaining safety and providing visual guidance to pilots as they prepare for takeoff or landing. This consistency in lighting color helps to prevent confusion, allowing for safer aircraft movements on the ground. The other colors mentioned have specific applications in aviation, such as red for indicating hazards or stop points and yellow for taxiways or additional guidance, but white is the definitive marker for runway edges.