求翻译：　　7月9日，高速交警衢州支队四大队在京台高速衢黄路段执勤。下午1点20分，一辆挂着福建临时牌照的低平板半挂车经过卡点收费时，现场民警发现了奇怪的一幕：庞大的平板车上驮着一辆自卸货车，货车的驾驶室拉起车帘，挡住警察的视线。是什么意思？

　　On July 9, Quzhou, high-speed traffic police detachment patrol of four team in Beijing and Taiwan high speed chains yellow sections. 1:20 P.M., a Fujian hung low flat semi-trailer of a provisional licence after card fees, the scene police found a strange scene: huge bear on a Flatcar of a dump truck, lorry cab pull up the curtain, blocking police's line of sight.