VANET (Vehicular Ad-hoc Network) is a new technology which has taken enormous attention in the recent years. It is a subclass of Mobile ad hoc networks which provides a unique approach for intelligent transport system (ITS). The design of routing protocols in VANETs application is very important and essential issue for supporting the smart ITS. A Complete understanding of the communications Channel between vehicles is required for realistic modeling of VANETs application and the development of related technologies and applications needs. This proposed paper gives a brief summary of different types of routing protocols which are adapted in various routing algorithms in VANET where it has been divided into four types they are unicast, broadcast, multicast, and geocast, however the multicast and geocast can be merged in one class because geocast usually is a unique type of multicast transmission..
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VANET, Transmission Strategies, ITS, Routing Protocols, UniCast, Multicast, Geocast