At all major airports, air-traffic controllers deal with inbound and outbound aircraft, ground traffic on runways and flight- lines, taxiing aircraft, and airport maintenance, fire, oil, and support vehicles, among others. As well, they must watch for any possible intrusion by unforeseen hazards, such as illegally parked or moving vehicles and airplanes. These are all daunting tasks, particularly when weather is poor and controllers have limited visibility of ground operations. Yet, today, many airports, both large and small, do not have an automated warning capability for ground operations.
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