What is a characteristic of approach light systems related to distance from the runway?

The characteristic of approach light systems relevant to distance from the runway is that they are configured to extend 2,400 to 3,000 feet from precision runways. This design serves to assist pilots in visualizing the landing environment, especially during low visibility conditions, by providing a series of lights that guide the aircraft toward the runway.

For precision approaches, the longer extension of these lights enhances situational awareness for pilots, allowing them to better align and descend correctly onto the runway. The effective range of 2,400 to 3,000 feet is critical in providing the necessary transition from instrument flight to visual references, ensuring that pilots can safely navigate during the final approach phase.

The other options do not accurately represent the characteristics of approach light systems. For example, while approach lights start at the runway threshold, the specific distance related to precision runways is much longer.