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Efficient data delivery in vehicular networks has received increasing attention in recent years. Existing routing protocols for vehicular networks can be loosely divided into two classes: Road Based Routing (RBR) and Road Oblivious Routing (ROR). RBR finds a routing path along roads while ROR does not explicitly forward packets along roads. The authors have the observation that using either of an RBR algorithm or an ROR algorithm alone in a realistic vehicular network setting leads to deficiency. This results from the fact that network conditions can be different at different locations and evolving over time.
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