【今日演講快訊】 Speaker: Dr. Wantanee Viriyasitavat, Research Scientist, Department of Electrical and Computer Engineering, Carnegie Mellon University Topic: Modeling Vehicular Traffic in Urban Areas: A Cellular Automata Approach Time: July 11th (Thur) 2PM-3PM Place: 資工系館110演講廳 Abstract: Modeling complicated traffic behavior in urban areas has been a challenging task for the past several years. In contrast to one-dimensional traffic observed in highway scenarios, traffic in urban areas can move in a two-dimensional fashion. The crossing of two different directional flows gives rise to intersections and their control mechanisms which further complicate the behavior of urban traffic. Modeling such traffic is therefore more complicated and difficult than that of highway traffic. In this paper, we employ a powerful Cellular Automata concept to construct an urban traffic mobility model. Based on the developed model, characteristics of global traffic pattern in urban areas are studied. Our results indicate that despite its two-dimensional nature, the inter-vehicle spacing of urban traffic can be approximated by an exponential distribution. We also observe a non-uniform traffic distribution: regardless of traffic density, while some areas are congested others have very low traffic. This coexistence of dense and sparse traffic regimes can be observed globally (over an entire network) and locally (within a small segment of network). These findings provide important insights into the network connectivity behavior of urban traffic which is essential for designing appropriate routing protocols for vehicular ad hoc networks in urban scenarios.
Posted on: Thu, 11 Jul 2013 04:55:50 +0000
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