What feature helps identify safe entry points onto a runway?

Runway guard lights are important for ensuring safety in the vicinity of runways as they provide a clear visual indication of where safe entry points onto a runway are located. These lights are used to alert pilots and vehicle operators when they are approaching a runway intersection or entrance, particularly in low visibility conditions. The illumination helps to differentiate between safe and unsafe areas, guiding operators to make informed decisions and reduce the risk of incursion onto active runways.

In contrast, runway edge lights mainly define the physical limits of the runway but do not specifically indicate safe entry points. Taxiway location signs provide information about the taxiway and can indicate distance to runways, but they do not serve the primary function of signaling safe entry onto runways like runway guard lights do.