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We evaluated the performance of an ad hoc network in a mobile environment in order to access its feasibility as an infrastructure for vehicle-to-Internet communication services. To realize this kind of service. The infrastructure should provide wide range where the service is available. We expected that by using an ad hoc network, spatial service range, connection time to the access point while driving, and amount of data transferred from the access point would be better than in existing public wireless LAN services. In the experiment, three cars acted as mobile nodes, and we measured the connection time to the access point and the amount of data that could be given via the access point. The result confirms the feasibility of using an ad hoc network as an infrastructure for vehicle-to-Internet communication services.