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Vehicular ad hoc networks (VANETs) have been proposed to provide safety and non-safety services for the passengers on board. Reliability in broadcasting of safety messages is one of the fundamental challenges in the design of such networks. In this paper, we study the impact of employment of repetition and piggybacking techniques on the performance of safety messages dissemination in an IEEE 802.11e-based VANET. The adequacy of the proposed techniques has been evaluated by a simulation. The results of this simulation show that the performance of VANET improves by setting proper parameters and the number of repetitions per priority class. Further, controlling the number of repetitions by piggyback technique can highly improve the performance of VANET for broadcasting of safety messages.