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A multi-homed vehicular mobile network uses different wireless and radio communication technologies to reach the Internet through multiple routing paths. Because of network mobility and lack of reliable quality-of-service (QoS) support in these communicating technologies, it is challenging to guarantee high quality in vehicle-to-infrastructure (V2I) communications. In this paper, we evaluate a novel policy to support resource reservation for mobile networks. We also define a probing mechanism based on IPv6 messages and traffic load estimation at mobile routers and home agent to enable NEMOs choose the most optimal egress routing path to reach Internet. Intelligent transportation service providers (ITSPs) can deploy this proposed QoS architecture to realize Service Level Agreements (SLAs) based on QoS negotiation with NEMOs or quality in provisioned multimedia services for on-board users.