Browsing by Author "Wu, Yuh-Ting"

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Microscopic analysis of desired-speed car-following phenomena
(2005)
Cho, Hsun-Jung
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Wu, Yuh-Ting
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運輸與物流管理系註：原交通所+運管所
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Department of Transportation and Logistics Management
A car-following model is proposed in. this paper. The proposed model presents a new concept to describe car-following process. Repulsion and thrust act on a following vehicle, and the following vehicle chooses an appropriate speed under the repulsion and the thrust. Illustrative simulations are presented. The simulation result indicates that the proposed model is reasonable, and it can reflect some traffic flow phenomena, such as local stability, asymptotically stability, closing-in, and shying-away. It is worth mentioning that the proposed model employ driver desired speed as model variable so that the proposed model can explain why drivers keep different speeds or different gaps under the same condition. The proposed microscopic model can be the research basis of macroscopic traffic flow model.
Microscopic analysis of desired-speed car-following stability
(2008-03-01)
Cho, Hsun-Jung
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Wu, Yuh-Ting
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運輸與物流管理系註：原交通所+運管所
;
Department of Transportation and Logistics Management
A desired-speed car-following model is proposed in this paper. The driver's desired speed is considered so that the model can reflect the driver's characteristics and the difference between drivers. The model can explain why different drivers maintain different speeds or spacing under the same condition. The necessary and sufficient conditions for stability are discussed, and they indicate that if the driver's desired speed is close to equilibrium speed, traffic is stable. Otherwise, if the difference between the driver's desired speed and equilibrium speed is large, traffic may be unstable. (C) 2007 Elsevier Inc. All rights reserved.
Modeling and simulation of multiphase traffic flow
(2007)
Cho, Hsun-Jung
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Wu, Yuh-Ting
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運輸與物流管理系註：原交通所+運管所
;
Department of Transportation and Logistics Management
This study discusses and simulates certain macroscopic traffic flow phenomena based on a microscopic traffic flow model. The phase transition, "free flow to synchronized flow", is discussed, and the simulation indicates that the phase transition leads to capacity drop. Another important feature of multiphase traffic flow- traffic hysteresis is also reproduced. This study explains why capacity drop and traffic hysteresis form from the viewpoint of driver behavior. Simulation examples of capacity drop and traffic hysteresis are provided and they demonstrate that the proposed model can represent the two classical hysteresis pattern types founded by Treiterer and Maes.