Considering the high-speed mobility of nodes, the need for low latency and high reliability of information transmission in vehicular ad-hoc networks (VANET), multi-network convergence has become an inevitable trend in the deployment of VANET architecture. Since information transmission only needs to occur between vehicles within a certain range in VANET, D2D technology was introduced into the communication mode of VANET for message transmission, which fully combines the self-organizing and hybrid networks within the coverage range of vehicles. An interrupt mode information transmission mechanism was proposed, where unless the driving state of the vehicle changes, other vehicles are notified, and at other times, only a confirmation message is sent to other vehicles at certain intervals in order to determine whether the vehicle is still in the protection circle or whether the link is unblocked. Simulation results show that the transmission mechanism can effectively increase the number of vehicles that transmit information to each other, save signaling overhead in order to avoid network congestion, and also increase the channel capacity of all nodes in the coverage circle.