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In ad hoc networks, a diversity of routing protocols exists. Each network selects a routing protocol suitable for its own environment such as a vehicular ad hoc network (VANET), a wireless mesh network, or a mobile ad hoc network (MANET) that consists of pedestrians. Generally, since there is no interoperability between different routing protocols in ad hoc networks, the communication between different networks is impossible. Therefore, in this paper, we propose Ad hoc Traversal Routing (ATR) to provide interoperability between different networks. Because of ATR, any two nodes in different networks can seamlessly communicate with each other. ATR connects two different networks to each other by converting control messages from one network to another network and adding the node address of different networks into the routing table for routing protocols. In addition, we conduct simulation experiments to evaluate the performance of ATR in heterogeneous wireless network environment that consists of a vehicle ad hoc network, a wireless mesh networks, and a mobile ad hoc network.