Dynamic Traffic Simulation Of At-Grade Intersection Based On Object-Oriented

To raise the utilization of the urban road availably and resolve the traffic blockage problem, it is necessary to analyze present urban traffic condition scientifically and find out the reasonable improvement measure. As an important traffic optimizing measure, microscopic traffic simulation is a technique of reproducing the dynamic process of traffic flow and is able to reflect complicated traffic phenomena by means of computer mathematics models. It can be widely used in many aspects such as evaluation of traffic management system design and road geometry design, traffic theory study, traffic safety analysis, new technologies and concepts testing. It has been an important assessment implement of the application of intelligent transportation systems (ITS).In this paper, based on the Object-Oriented Programming, microscopic simulation software of urban traffic is realized using vehicle-moving model from traffic flow theory and computer simulation theory, in which a main road consisting of three intersections in series is taken as research object. The establishment of the simulation software is based on the integrated development environment of Java which is named JBuilder6.0. The system basically realizes the following functions such as network construction and management, simulation of animation for vehicle motion, traffic control simulation, date statistic, openly input of traffic schedule and so on. Concrete contents are as following:(1) The urban microscopic traffic system simulator is developed with the Object-Oriented method and visualization technology. This paper accomplished the system need analyses, function model design, object model design and system frame design. In the simulator, a graphical user interface allows the users to visualize the simulation process, including animation of vehicle motion, state of traffic signals and indication of traffic condition.(2) The investigation of urban microscopic traffic simulation on model system.Model system is the core content of urban microscopic traffic simulation System. The validity of model system decided the success or failure of urban microscopic traffic simulation system directly. The thesis mainly based on modeling and practicing system of microscopic traffic flow simulation in urban arterial. First of all, we have established models of microscopic traffic flow, such as: network model, car-generation model, car-dynamical model, acceleration and deceleration model, free flowing model, car-following model, signal control model, event responding model, etc. Then have programmed module of all models, and determined the method of system simulation.(3) A concrete simulation experiment is introduced in the paper, which tested the software functions and validated the software realization of the traffic participant algorithm and the fidelity of the traffic participant behaviors. Adjustment scheme of the factor which impact arterial capacity and the real time adjustment flow of arterial control were presented. Additionally, comparison results of signal parameter and appraise indexes are given.Through establishment of the research work of which stated in this thesis, this paper have realized microscopic traffic flow model algorithm and real time green control of one-way street, and found the method of traffic flow simulation used Java, and done the 2D simulation software. All of this has made a good foundation of continuing the research job of traffic flow simulation lately.