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Though security and privacy are two important issues in vehicular networks, limited works are done on the design of communication protocol until recently. Several proposals tackle these issues in the cryptographic way, such as using group signature to construct vehicular communication protocol. The proprieties of anonymity and traceability make group signature to the purpose to be used in designing secure and privacy-preserving vehicular communication protocol. We would point out that a current communication protocol for vehicular networks is not privacy-preserved, for its basis, a group signature, is unsatisfied with anonymity. In the end, we propose a new one which is based on one current efficient group signature.