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Vehicular Ad hoc NETwork (VANET), a subclass of mobile ad hoc networks (MANETs), is a promising approach for the Intelligent Transportation System (ITS). The key difference of VANET and MANET is the special mobility pattern and rapidly changeable topology. Temporary network fragmentation problem and the broadcast storm problem are further considered for designing Message propagation in VANETs. The temporary network fragmentation problem which happens in free flow caused by rapidly changeable topology influence on the performance of data transmissions. The broadcast storm problem in congested flow network seriously affects the successful rate of message delivery in VANETs. This paper presents a connectivity analysis under free flow and congested flow scenario in Vehicular Ad hoc Networks.
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