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Vehicular Ad-hoc Networks (VANETs) is an improved form of Mobile Ad-hoc Networks (MANETs), where the vehicles moving in a predefined route with relatively high speed. Due to high rate of topology changes in VANETs, frequent disruption in link and excessive overhead occurs. An intelligent transportation system (ITS) is being approached by using VANET therefore the need of efficient VANET routing protocol is crucial. In VANET routing protocols, an efficient route must be established between nodes before communication can take place and it should adapt dynamic topology changes caused by rapid movement of vehicles. In this paper, different routing protocols in VANET are described which may help in designing improved routing protocols.
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