Urban Intelligent Traffic Signal Control System

The congestion of urban traffic is a crucial problem to be solved, and the base unit of the traffic control is the traffic semaphore. The paper introduces some details of the XATM Intelligent Traffic Semaphore. The paper focuses on the kernel control circuit, communication circuit, DOG circuit and so on. Moreover, the design thought of some programs according to all the above is also introduced. The using outcome show that the system can realize multiphase and variable phase sequence control, can solve the problem of mixture traffic flow, can be used conveniently and would be maintained easily.In the paper, the Tamura Time Delay Algorithm is applied to the program of allocating the time of the traffic signal on the basis of the XATM Intelligent Traffic Semaphore. The algorithm can change the fonctionelle optimization problem to the variable optimization problem, reduce the dimension of the matrix and overcome the calculation difficulty. The result of simulation indicates the algorithm can dispersal the length of traffic queue.The XATM Intelligent Traffic Semaphore has passed the check and accept presided by Shaanxi Science & Technology Committee, and the use of it is being popularized in Xi'an.