What is the purpose of blinking runway lights?

Blinking runway lights serve a critical role in airfield operations by providing visual cues to alert vehicles and pedestrians that they need to vacate the runway area. When these lights are blinking, it is a clear indication that the runway is either active or in use, signaling non-aircraft personnel to stay clear for safety reasons. This functionality is vital in preventing accidents and ensuring that aircraft can operate without obstruction.

In contrast, other options represent different functions that runway lights do not fulfill. For example, while signaling an active runway might involve lights, blinking lights do not specifically indicate an emergency landing or signal aircraft to take off. Similarly, guiding aircraft for landing typically relies on steady or directional lights rather than blinking indicators. The primary and most accurate interpretation regarding the blinking lights is their role in maintaining runway safety by advising all ground personnel to clear the area.