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.The runway edge lights are white, except on instrument runways amber replaces white on the last 2000 feet or half of the runway length, whichever is less, to form a caution zone for landings.The HIRL and MIRL systems have variable intensity controls, where the RLs normally have one intensity setting. They provide a visual contrast between runway and the abutting terrain or shoulders. The 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 (RL). Runway side stripes delineate the edges of the runway.
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