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Inter-contact time between mobile nodes that captures the temporal characteristics of Vehicular Ad Hoc NETworks (VANETs) has been intensively studied. Whereas the node spatial distribution is ignored in most existing mobility schemes, which is also worthy of investigation, particularly for real applications. Moreover, the node spatial distribution has a significant influence on the inter-contact time. In this paper, the authors study the empirical data acquired from taxis in Shanghai city. They find that most taxis distribute on some hot roads which makes the node spatial distribution appear power law.
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