说明：  本档含详细的电路原理、源程序，AT89C51主控，利用车辆检测器不仅可开发电子警察，还可开发出如：自动显示泊车数的停车场，实时配时的路口信号机系统，自动车库，交通车流量计数器等。
(The file containing detailed circuit principle, source, AT89C51 master the use of vehicle detector electronics can be developed not only the police, but also developed such as: automatically displays the number of parking spaces car park, with real-time signal at the junction system, automatic garage, traffic flow, such as counters.)