In vehicular networks, sparse roadside vehicular communication (RVC) systems on highways are difficult to provide full coverage\r\nof existing roadways because the distance between the roadside units (RSUs) is farther than the RSU�s transmission range. In\r\nsparse RVC, collision-free communication is required because the time available for communication is very short. In addition, the\r\ncollision-free communication has an energy-efficient feature. Therefore, we propose an energy-efficient broadcastMAC protocol in\r\norder to expand the service coverage in RVC systems and collision-free communication. The proposed protocol performs a hybrid\r\nvehicular communication (HVC). It has a rebroadcast mechanism using a vehicle�s velocity, distance, and angle fromnearby vehicle\r\nfor collision-free communication. Then, we show our protocol�s performance evaluation using ns-2.
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