The lights marking the ends of the runway emit red light toward the runway to indicate the end of runway to a departing aircraft and emit green outward from the runway end to indicate the threshold to landing aircraft. VGLS is focused on sustaining and supporting Performance Based. Enabling pilots to more effectively identify the runway environment, align with the runway centerline and achieve stable, wings-level attitude for landing. On instrument runways, yellow replaces white on the last 2,000 feet or half the runway length, whichever is less, to form a caution zone for landings. Visual Guidance Lighting Systems (VGLS) provides visual guidance to pilots during the approach and landing phases of flight. The HIRL and MIRL systems have variable intensity controls, whereas the LIRLs normally have one intensity setting. These light systems are classified according to the intensity or brightness they are capable of producing: they are the High Intensity Runway Lights (HIRL), Medium Intensity Runway Lights (MIRL), and the Low Intensity Runway Lights (LIRL). Runway edge lights are used to outline the edges of runways during periods of darkness or reduced visibility. Three prerequisites must be met before a runway can be considered for REIL establishment. First, high-volume commercial and international airports have a variety of lighting systems to guide aircraft to the touchdown point, and to control ground traffic approaching the runways via. Red lights are faced inwards and signal the end of a runway, and green lights are faced outwards and signal the approaching start of a runway. At the very end, red or green lights are used. On instrument runways, yellow replaces white on the last 2,000 feet or half the runway length, whichever is less, to form a caution zone for landings. Airport lighting, to be used to guide and inform pilots, can vary widely from one airport to the next. Typically, yellow lights are used for the last 2,000 feet or half the runway length (whichever is less).
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