VANET has emerged as a new network environment for intelligent transportation applications. Numerous research issues have recently been identified and should be tackled before real implementations of pervasive vehicular applications and location-based services. The design and the implementation of efficient and scalable routing protocols constitute one main issue. In this paper, the performance of three geographic routing protocols are studied and evaluated using network simulator ns2 in city environments. Several performance metrics, such as end-to-end delay and packet delivery ratio, are evaluated and results are reported to provide an assessment of the suitability of these protocols for vehicular ad hoc networks.
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