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Published online by Cambridge University Press: 18 January 2010
The post-war development of air transport has temporarily out-paced the ability of the air traffic control service to provide for safe conduct which is always expeditious, and it has certainly out-moded the concept of visual avoidance. To alleviate the situation in the areas of high-density traffic in the United States, the Air Transport Association of America outlined a requirement for an airborne collision warning device.