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The Public Evacuation Navigator is an UAV system that transforms an unorganized and unintentional evacuation into an orderly and stable evacuation in a crowded event in public places. It is part of the police force that can help police conduct evacuation in areas they can not reach on time. It shows people through screens and loudspeakers the escape route and the flow of people across the region, while guiding people to protect themselves. Its indicator visually shows the density of people in the area below it.