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With the recent rapid increase in the number of motor vehicles on roads, traffic accidents have increased, and emergency reporting processes have become essential. In this paper, a key agreement protocol for a real-time traffic sharing system is proposed for Vehicular Ad-Hoc Networks (VANETs), in which a broadcast center authenticates the legitimacy of a user when they report an emergency and issues a certificate of emergency to other users. This study uses a digital signatures mechanism, key agreement and authentication scheme to satisfy the security requirements for a VANET. Burrows-Abadi-Needham logic (BAN logic) is applied to prove that the proposed scheme achieves secure authentication. The proposed protocol ensures the privacy of the communication between fleets and provides a mechanism for immediate emergency reporting. The experiment results show that the proposed scheme is feasible and meets security requirements.