Vehicular ad hoc network is a subtype of Mobile ad hoc network, which is design for the communication of vehicles. It is a technology in which moving vehicles create a network for the mobile communication, vehicles in network act as a node. In this network vehicles move rapidly and speed of vehicles in VANET is more than MANET. Some wireless technology support to the vehicle to vehicle (v2v) and vehicle to infrastructure communication (v2I) in VANET. Performance of communication between vehicles depends on the routing protocol. One of the main challenge in the VANET is transmit the data information and search the route. Routing protocols are used in the VANET. One of the most important routing protocols used in Vehicular ad hoc network is GPSR routing protocol is used for the congestion problem. In this paper we study all the routing protocol and comparison between three routing protocol.
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