一个电子警察的红绿灯信号控制系统的信号灯显示系统，采用GDI的技术，可以动态显示信号灯的 状态，对交通有用-Police of an electronic control system for traffic lights signal lights display system, the use of GDI technology, you can dynamically display the status of traffic lights, traffic useful

实现交通信号灯，红绿黄等的切换，实现暂停，返回等需求功能！(It can achieve the traffic signal.)