Preliminary Studies And Applications On Data-driven Based Grid Urban Traffic Information System

"Based on the data" refers to the starting point of research is the system practical operation data. By analyzing the data, we can obtain the characteristics, patterns and rules of the object, and then realize the management and control to the system."Gridding", also known as unitization, is a type of system division and organization method. The aim of it is to reduce the complexity of system in order to upgrade the management level and improve the control effect.The research object of this paper is the urban traffic systems, and the construction and implementation of the urban traffic system are discussed based on data-driven ideas and grid management theory. In this paper, the data-based gridding urban traffic information system framework is established. The principles of how to divide the traffic grid and deploy the collection equipments for flow data in gridding traffic are proposed, and further, how to evaluate the running status of the transportation system and so on is studied. In urban traffic system studies, the research and application of whether the theory based on data or the theory of gridding management are all cutting-edge issues. The main researches and innovations are summarized as follows:(1) The new concept of "Digital Traffic" is proposed, and doing a reaserch about the developing disciplines of urban transportation systems.By analyzing the current concept and connotation of "Digital Traffic", proposing the new definition of "Digital Traffic". Point out the3stages of the developing of urban transportation system. Analyze the features of the developing of traffic engineering, and digital traffic and intelligent traffic and the relations between them.(2) Proposing the research framework of the data-based gridding urban traffic system, and the running mechanism and trigger mechanism of data-based gridding urban traffic management system.(3) Proposing a notion of traffic grid. The principle of division of traffic grid and gridding traffic flow collection technologies selection is studied. On this basis, the gridding traffic flow detector distribution principle is proposed.(4) A data-based single intersection signal control performance measurement method based on dynamic data is proposed. A freeway congestion identification method based on section travel time is proposed. A traffic grid performance measurement method based on check line is proposed. (5) In the project of "The gridding vehicle license plate recognition information integrated application system of Shenzhen", a part of the theory in this paper has been implemented, and the shortages in system construction have been summarized.