A reliable and efficient highway broadcast model based on gain prediction is proposed to solve excessive information\r\nretransmission and channel conflict that often happen to flooding broadcast in vehicular ad hoc network. We take accountof the\r\nrelative speeds, the intervehicle distance, and the coverage difference of the neighboring vehicles into predicting the gain of every\r\nneighbor, and further select the neighbor with the maximum gain as the next hop on the every direction of road. Simulations show\r\nthat the proposed model is clearly superior to the original flooding model and a recent variant based on mobility prediction in\r\npacket arrival rate, average delay, forwarding count, and throughput.
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