Title the Traffic Analysis and Prediction Systems under Intelligent Transportation Systems: Development of Real-Time Control Module(1/2)
Dept Transportation Energy and Environment Division
Year 2006
Month
Price
Summary The Institute of Transportation initiated the project entitled “Demonstration Project of Regional Intelligent Transportation Systems: Traffic Analysis and Prediction Systems“ since 2003, and the main purpose is to provide an advanced simulation-assignment model for traffic engineers as well as transportation planners under the environment of Intelligent Transportation Systems.  This project basically reviews current on-line Dynamic Traffic Assignment (DTA) models and algorithms, such as DYNASMART and DynaMIT, and takes into account some important native traffic flow characteristics and trip-maker behaviors.  The model developed through the project is named as DynaTAIWAN (Dynamic Traffic Assignment and Information in Wide Area Network), which exhibits most functional capabilities of traffic simulation and assignment in an information-based network. The conceptual framework of DynaTAIWAN includes two layers, namely the simulation layer and the real-time control layer.  The simulation layer is designed to simulate vehicular flows in a realistic traffic environment with considerations of traffic flow characteristics, pre-trip travel behaviors, and en-route behaviors.  The real-time control layer utilizes real-time data and predicts flow patterns for designing traveler information and traffic control strategies.  
  　The present research extends the functional capabilities of DynaTAIWAN, which develops multi-class Dynamic Traffic Assignment Algorithms with specific consideration of motorcycles, and implements the real-time control layer.  Four different behavior rules considered are PS (pre-specified), User Equilibrium (UE), System Optimization (SO), and Real-time Influenced (RI). In order to effectively predict short-term flow distribution, the real-time control layer adopts the rolling horizon approach to incorporate real-time flow data and simulates traffic flows from the simulation layer.  The OD (Origin-Destination) estimation and prediction is a critical issue in the real-time control layer
  　DynaTAIWAN can be applied to regional areas, including intercity highway and urban road systems.  Traffic control operators and/or transportation planner could evaluate flow distribution under a variety of strategies and scenarios through DynaTAIWAN, such as travel demand variations, work zone analysis, new transportation facilities, and traffic control measures.
Post date 2006/07/20
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