前言随着我国交通事业的发展，交通需求的增加，很多大、中城市都建立或正在筹建交通指挥控制中心，采用现代化的手段对城市的交通信号进行集中式的控制，使之提高道路的通行能力，减少交通阻塞。作为交叉路口的信号控制设备，也从单点定周期，全感应控制方式，逐步发展到计算 Preface With the development of China’s transport industry and the increasing demand for transportation, many large and medium-sized cities have established or are planning to establish traffic command and control centers. They use modern means to centrally control the traffic signals in the cities so as to enhance the traffic flow of the roads Ability to reduce traffic congestion. As the intersection of signal control equipment at the crossroads, but also from a single point of fixed cycle, full induction control, and gradually developed to calculate