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GPS-equipped taxis can be regarded as mobile sensors probing traffic flows on road surfaces, and taxi drivers are usually experienced in finding the fastest (quickest) route to a destination based on their knowledge. In this paper, we mine smart driving directions from the historical GPS trajectories of a large number of taxis, and provide a user with the practically fastest route to a given destination at a given departure time. In our approach, we propose a time-dependent landmark graph,doi:10.1145/1869790.1869807 dblp:conf/gis/YuanZZXXSH10 fatcat:c6r5v6qwfbeo5aiowxs3ytmfju