From the system structure and control mode, there is a centralized computer control system and a distributed computer control system from the system control strategy, there are static and dynamic systems.

(1) British TRANsYT traffic signal control system [31TRANsYT (TrafficNetworkstud Xi tools) is by the British road research spent nearly a decade developed control system. TRANSYT system is used in more than 400 cities in the world. It is the most successful static system at present. TRANSYT system uses wired communication mode. The static mode is adopted to control the traffic signal lamp, and the parameters of the green signal ratio and the phase difference of the control scheme are determined by establishing the mathematical model. But the problem is that the computation of traffic data is large: it is difficult to get the whole optimal timing plan, and it needs a lot of network geometry and traffic flow data.

(2) Australia scAT [3]se lamp sydneyCoordinatedAdaptiveTraffieMethod is Australia in the late 1970s development. SCAT uses advanced computer network technology, computer hierarchical form. SCAT system uses wired communication mode. SCAT control mode is used in the regional level, in the central level of the online and offline at the same time. The parameters of the control scheme are determined by determining the parameters in advance and then changing according to the actual conditions. SCAT system fully reflects the outstanding advantages of computer network technology, the structure is easy to change, the control scheme is relatively easy to transform. However, SCAT system is too dependent on computer hardware, poor ability to transplant, select the control scheme, no real-time information feedback.

(3) British scoot system 12]seooT (SP a iteycleoffsetoptimizationTechnique) is by the British road research where TRANSYT system based on the adaptive control method, after eight years of research in 1980 proposed dynamic traffic control system. SCOOT using real-time control method, has been significantly better than the static system, the city road traffic signal control system for the ten wireless communications. SCOOT system uses wired communication mode. The control mode adopted is the on-line real-time control mode, that is, the dynamic mode. The parameters in the control model are determined by establishing an optimal mathematical model. Scoot system also exist problems and its phase can not be automatically increase or decrease, any intersection can only have fixed phase; the installation and the debugging are difficult, to the user of the high technical requirements.

The above information is provided by the traffic signal lamp manufacturer