NETWORK FLOW SIMULATION FOR URBAN TRAFFIC CONTROL SYSTEM
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THE REPORT DESCRIBES THE DEVELOPMENT, CALIBRATION AND VALIADATION OF THE NETWORK SIMULATION MODEL UTCS-1, DESIGNED TO SERVE AS A MECHANISM FOR EVALUATING ALTERNATIVE TRAFFIC NETWORK CONTROL STRATEGIES. THE UTCS-1 MODEL IS PROGRAMMED IN FORTRAN IV AND INCORPORATES THE FOLLOWING MAJOR FEATURES: (A) STOCHASTIC SIMULATION OF INDIVIDUAL VEHICLES BY TYPE, USING A SIMPLIFIED CAR-FOLLOWING MODEL WITH TIME- SCANNING PERIODS OF ONE SECOND; (B) CAPABILITY OF REPRESENTING A NETWORK OF, AT LEAST, 100 NODES; (C) A COMPLETE SET OF MEASURES OF EFFECTIVENESS OF THE TRAFFIC SYSTEM IN THE OUTPUT, (D) DETAILED TREATMENT OF PEDESTRIAN/VEHICLE INTERACTION, BUS TRAFFIC AND INTRA-LINK FRICTION SUCH AS ILLEGAL PARKING AND TAXICAB STOPPAGES; (E) SIMULATION OF ELECTRONIC SURVEILLANCE SYSTEMS; AND (F) REPLICATION OF ALL FORMS OF TRAFFIC CONTROLS INCLUDING REAL-TIME DYNAMIC SIGNAL CONTROL SYSTEMS. /AUTHOR/Keywords:
Network traffic simulation
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A modeling framework was developed to analyze the effect of traffic information strategies on the performance of congested traffic corridors with signal controlled intersections. The framework consists of three components: a traffic network simulation model, a route choice model to determine drivers' responses to given real-time information, and an information model. The traffic network simulation model is based on a periodic simulation approach and describes the dynamics of traffic flow in the network. The vehicles are moved each second according to car-following logic while responding to traffic control devices and movement of nearby vehicles. The driver decision component is microscopic and determines individual drivers' route choices based on available information at any node of the network. The information components calculate travel time information using traffic conditions predicted by traffic network simulation. This framework allows for the investigation of traffic information system performance under variable signal control, as well as under different information strategies. Results are presented for simulation experiments in a simplified actual network. The model gives simulated results close to observed values. The results illustrate the effect of the users equipped with in-vehicle navigation systems on overall system performance. In addition, to optimize system performance under advanced traveler information systems, signal control and informed rate must be evaluated at the same time. This modeling framework provides a useful approach in the design of traffic information systems throughout simulation experiments.
Network traffic simulation
Traffic simulation
SIGNAL (programming language)
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Urban regional traffic signal control and optimization is an important means to alleviate urban traffic congestion, and effectiveness evaluation is an important part of traffic signal optimization. The traditional traffic simulation softwares are generally evaluated by the built-in signal control module, which is out of connection with the actual signal control system and the accuracy of the evaluation is not high. In order to enhance the effectiveness of evaluation in connection with simulation software and signal control system, this paper presents an urban road network traffic control platform based on the hardware-in-loop simulation. The logical framework, function architecture, central system and controller interface etc. of hardware and software modules of the platform are designed. The arterial coordination control algorithm and regional cooperative control algorithm are integrated. The example analysis shows that the platform builds the bridge of the traffic simulation software and the traffic signal control system, and it can effectively evaluate the traffic control effect of the road network. Based on this platform, effectiveness evaluation of the regional traffic signal control, improvement for control algorithms and signal optimization can be carried out.
SIGNAL (programming language)
Traffic simulation
Simulation software
Interface (matter)
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After analyzing the current urban traffic network model, this paper presents a new method for building the new 3D simulation model by using ArcGIS software. We developed the 2D and 3D models of topology network, traffic inspection, traffic control and management. The 2D model of traffic intersection and 3D model of urban road network based on DEM are described in detail. At last, the results of simulation are analyzed, which shows that the road model effectively provides special reference, geometrical model and logical model for other mathematic models in the simulation system,and provides storage-space and operation-space for various traffic behavior models and scheduler interface for diversified arithmetics. As compared with forepassed urban traffic model, these models give a more accurate and detailed description of the road network topology and geometry, and lay a good foundation for the traffic simulation models to describe the network traffic state more realistically.
Network traffic simulation
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A method is described to connect microscopic, mesoscopic and cellular automaton based traffic models in order to allow the model's concurrent simulation. The traffic models are characterized by different levels of modelling detail and distinct simulation platforms. The approach includes the assignment of appropriate simulation tasks for the model components as elements of a complex hybrid model. Furthermore, implementation related aspects of network parts and the concurrent simulation of the hybrid model by means of separate simulation kernels are discussed. New approaches of simulation technology as High Level Architecture (HLA) were applied and adapted with regard to design of interfaces and synchronization management. A realistic model of an urban traffic network was developed as a reference and it demonstrated how to build up and transform each of the model types. To solve this task, the applicability of Geographic Information Systems was examined and in conclusion used for the purpose of model design.
High-level architecture
Network traffic simulation
Traffic simulation
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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.The system basically realizes the following functions such as network construction and management,simulation of animation for vehicle motion,traffic control simulation,data statistics,openly input of traffic schedule and so on.All of this has made a solid foundation for the further research about traffic flow simulation in the future.
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Simulation software
Network traffic simulation
Simulation Modeling
Three-phase traffic theory
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