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Intelligent transportation systems could improve transportation safety, driving assistance and traffic management system. Vehicular Ad hoc NETwork (VANET) is an emerging field of technology, embedding wireless communication networks into vehicles to achieve intelligent transportation systems. The development of such systems pose many unique challenges like designing routing protocols that not only forward packets with good end to end delay but also take into consideration the reliability and progress in data packets forwarding. In this paper, the authors begin by presenting a review of recent unicast, geo-cast and broadcast routing protocols for message transmission. They, then outline a novel Delay and Reliability aware Routing (DR2) protocol that addresses these challenges (forwarding packets with low latency, high reliability and fast progress toward destination).
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