Abstract: Vehicular Ad-hoc Network (VANET) is a most critical class of mobile ad-hoc network (MANET) which enables intelligent communication among vehicles and also between vehicle and roadside infrastructures. It is a promising approach for the Intelligent Transport System (ITS). There are many challenges to be addressed when employing VANET. It has a very high dynamic topology and constrained mobility which makes the traditional MANET protocols unsuitable for VANET. The aim of this review paper is to give an overview of the vehicular ad hoc networks, its standards, applications, security issues and the existing VANET routing protocols.

Keywords: VANET, ITS, dynamic topology, mobility, routing protocols.