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When emergencies occurred in densely populated place，people will feel panic in the absence of guidance and cause secondary accidents in the process of flurried escape. The police can't get to the scene quickly because of the distance or the traffic condition,and they can't reach the center of the crowd.The evacuation drones can reach the accident scene earlier than the police. The police can control the scene by operating the the evacuation drones, and use sound and light to direct the crowd to escape in the right direction.