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The authors propose a novel application adaptive (multi-mode) headway-based broadcasting protocol that is most appropriate for public-safety applications in VANETs. Being headway-based, the proposed protocol possesses unique robustness at different speeds and traffic volumes. Moreover, it addresses application differences with a new multi-mode feature. The logic behind the new concepts/approaches adopted in the protocol and their merits are highlighted, supported with analysis and simulation. Tens of millions of vehicles crash worldwide per year causing millions of injuries and fatalities with cost over $300 billions.
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