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Many solutions have been developed for routing messages in ad hoc networks. However, few of them are efficient when the network is highly dynamic. Indeed, building a routing table, discovering and maintaining a route, or localizing a node is a great challenge when the dynamic is high. This topic is currently attracting attention with vehicular ad hoc networks (VANETs), which are a special case of highly dynamic networks. VANET may allow us to enhance road safety and to develop new driver-or passenger-oriented services. In this paper, we present a novel approach for routing in highly dynamic networks, relying on condition-based communication. Instead of transporting addresses (or positions), a message is sent with some conditions used for retransmission or reception. Owing to the dynamic evaluation of the conditions, we show that this solution can efficiently support the high dynamic of vehicular networks.