What are the red and white alternating lights intended to signal in the context of runway lighting?

The red and white alternating lights on a runway are specifically designed to signal that an aircraft is approaching the end of the runway. This lighting system is strategically placed at the runway's threshold to provide visual cues to pilots during their approach and landing phases. The alternating red and white colors help to define the limits of the usable runway length, alerting pilots that they are nearing the end of the runway where they may need to take appropriate actions, such as initiating a go-around if they are unable to land safely within the remaining runway distance.

This information is critical for pilots, especially in low visibility conditions, as it aids in situational awareness while also enhancing safety during landing operations. Proper identification of runway markings and lights is essential in ensuring a safe landing and avoiding potential mishaps.