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Recently, vehicular sensor networks (VSNs) have been paid much attention. In VSNs, the vehicular sensors are equipped on vehicles, such as buses and cars. They move fast and have no strict constraints on processing power and storage capabilities. In this challenging mobile and novel environment, routing is a hot issue which needs more attention in the future works when traditional wireless sensor network routing approaches for data reporting become unfeasible. In this paper, we overview challenging issues of routing protocols for VSNs, and summarize and compare routing protocols which are adaptable to VSNs.