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摘要 随着我国改革开放的不断深入 ,城市化进程不断加快 ,交通事业飞速发展 ,交通拥挤已成为城市经济发展的“瓶颈”,特别是大、中城市不断增加的车辆和有限的道路空间矛盾日益加剧。近年来随着科技的飞速发展，单片机的应用正在不断深入，同时带动传统控制检测。在实时检测和自动控制的单片机应用系统中，单片机往往作为一个核心部件来使用，仅单片机方面知识是不够的，还应根据具体硬件结构软件结合，加以完善。 十字路口车辆，行人熙攘，车行车道，人行人道，有条不紊。那么靠什么来实现这井然秩序呢？靠的是交通信号灯的自动指挥系统。交通信号灯控制方式很多。 With the deepening of reform and opening-up of our country, rapid urbanization, rapid development of the cause of the traffic, traffic congestion has become the bottleneck of urban economic development, especially the increasing of large and medium-sized cities of vehicles and the limited road space contradiction growing. In recent years, with the rapid development of science and technology, the application of SCM is unceasingly thorough, and promote the traditional control test technology is updated. In real-time detection and automatic control of microcomputer application system, the single chip microcomputer often as a core component to use, only single chip microcomputer aspects knowledge is not enough, still should according to the specific hardware structure with hardware and software, to be perfect. Lane crossing vehicles and pedestrians bustling, garage, pedestrian humanitarian, in an orderly way. So on to achieve this in order? Depend on the traffic lights automatic command system. Intelligent traffic lights command and the safe operation of the various kinds of vehicles, realize the automatic command of red, yellow, and green is an important subject of modern traffic management in urban and rural areas. Traffic lights control mode. This system adopts the MCS - 51 series microcontroller AT89C52 as the center components to design traffic light controller, realized according to actual traffic by 8051 chip of P3 mouth set of red, green function; the depth of the time Traffic light cycle, the countdown with 5 seconds left yellow light flashing warning (traffic signal through the P1 mouth output, show time through P0 port output to double digital tube). This system design cycle is short, high r