Advancements in self-driving technology, facilitated by artificial intelligence and smart transportation systems, have significantly enhanced safety and efficiency in autonomous vehicles, particularly through the concept of platooning. Recent studies highlight the potential of vehicular adhoc networks (VANETs) in optimizing the performance of self-driving cars when they travel closely together. Nevertheless, these studies often neglect the coexistence of self-driving and human-driven vehicles on the road. Addressing this, WAVE emerges as a crucial technology for communication in such mixed traffic scenarios. The WAVE standard has one CCH and six SCHs. To ensure efficient communication the proposed work considers platoon based multi-channel access for broadcast. The broadcast mechanism incorporates RTS/CTS for a multicast mode of communication. This paper provides a comprehensive throughput performance analysis of both Simple and Platoon-Centric broadcast techniques.