5月2日，交警通过无人机回传的画面对高速公路路况进行监控。今年“五一”小长假期间，广州交警首次使用无人机巡逻，重点针对车辆违法占用应急车道行为进行抓拍。 [新华社记者 梁旭 摄]
A traffic police monitors highway condition through images sent back by a drone in Guangzhou, capital of south China's Guangdong Province, May 2, 2016. The traffic police used drones to help them patrol during the three-day May Day holiday. (Xinhua/Liang Xu)