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A row of approach lighting system (ALS) with sequenced flashing lights, commonly used at airports to guide aircraft during the landing phase. The lights are mounted on tall, slender yellow poles, arranged in a straight line receding into the distance

A row of approach lighting system (ALS) with sequenced flashing lights, commonly used at airports to guide aircraft during the landing phase. The lights are mounted on tall, slender yellow poles, arranged in a straight line receding into the distance