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As a fundamental network property, Inter-Contact Time (ICT) determines the critical performance metrics of a Vehicular Ad-hoc NETwork (VANET). In this paper, the authors extract the contact information from the traces of Global Positioning System (GPS) from public and semi-public vehicles in a large modern city, including both buses and taxis. By exploring the spatial and temporal properties of the contact behaviors between both types of vehicles, they propose a multi-modal VANET message dissemination scheme, by allowing buses to assist the message dissemination among taxis.
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