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Among the others, online real-time vehicle tracking is a fundamental service in the SG project, which refers to tracking the current position of a certain vehicle in real time. A wide spectrum of compelling applications can be implemented on top of this basic service. For example, authorized users will be able to track individual vehicles that they are concerned with, such as their own or friends’ cars, public buses and taxies. In particular, there exist several critical types of vehicles in the city, which need to be located urgently, such as stolen cars, speeding cars, ambulances and police cars. Besides these application scenarios, it is also an indispensable building block underpinning many other high-level applications. For example, in the bus arrival prediction application, the tracking service is used to locate the nearest feasible bus.