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In Vehicular adhoc networks, due to the limited bandwidth, high vehicle mobility and density of vehicles, scalability is a major problem. Data aggregation is a solution to this. The goal is to combine the information and disseminate this in larger regions. Another criteria is all the messages should be unaltered in the delivery and should be authenticated ie authentication and integrity of the messages should be verified. In this paper, a certificateless aggregate signature protocol for vehicular networks has been proposed which makes RSU responsible for authentication, aggregation and verification of messages sent from vehicles. The RSU is also responsible for notifying the results back to the vehicles within its communication range, to other neighboring RSUs and to the application server for further analysis. Here, we adopt batch verification technique such that verification time can be reduced. The proposed scheme is based on bilinear pairing and hard computational elliptic curve discrete logarithmic problems (ECDLP). The scheme achieves conditional privacy preservation due to the use of pseudoidentity, while a Trust authority (TA) can always retrive the real identity.