Answer :
Final answer:
Runway End Identifier Lights (REILs) are flashing white lights that emphasize the approach end of a runway, aiding in its identification during landing, especially in poor visibility or complex backgrounds.
Explanation:
Runway End Identifier Lights (REILs) are designed to provide rapid and positive identification of the approach end of a particular runway. The correct answer to the question "What are Runway End Identifier Lights?" is option 1) Flashing white lights emphasizing the approach end of the runway.
These lights consist of a pair of synchronized flashing lights located on each side of the runway threshold. REILs are especially useful in conditions of reduced visibility or in the environment where the background is complex, making it difficult to distinguish the runway threshold. REILs are part of a suite of lighting systems that enhance the pilots' situational awareness during takeoff and landing phases.
It is important to note that the other options provided in the question refer to different kinds of lighting. Option 2) is incorrect as red lights are typically used to indicate the end of the runway, not the center. Option 3) refers to taxiway edge lights which are blue. Finally, option 4) is incorrect because green lights indicate the threshold of the runway for landing, not the departure end.
