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8月31日下午.郑州市副市长.市公安局局长黄保卫介绍.为了缓解郑州道路高峰期交通压力,准备启用直升机指挥交通。据介绍.警用直升机可以在500米以下空间自由飞行.20分钟可以到达城市的任何角落。一架警用直升机的
August 31 afternoon. Zhengzhou City Vice Mayor. Municipal Public Security Bureau Huang Baowei introduction. In order to ease the peak traffic pressure in Zhengzhou, ready to enable helicopter command traffic. According to reports, police helicopters can fly freely below 500 meters and reach the city in 20 minutes. A police helicopter