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For vehicle users, content distribution through roadside APs is an important complement to that through 3G and other cellular networks. However, the unique features of such access scheme pose many challenges on effectively satisfying vehicles' data request. This paper proposes a cooperative content distribution system for vehicles(CCDSV), based on the network-coding, vehicle-AP contact prediction, and data-prefetching techniques. CCDSV uses network coding to distribute encoded data for the effective sharing of popular contents. CCDSV predicts the vehicle's future contact APs and adaptively prefetches requested data in advance before vehicle's arrival. The proposed system is implemented into ns-2 simulator and demonstrates its effectiveness in terms of throughput, reduced traffic load, and download volume.