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Vehicular Ad hoc Networks (VANETs) aim to improve transportation activitiesthat include traffic safety, transport efficiency and even infotainment on thewheels, in which a great number of traffic event-driven messages are needed todisseminate in a region of interest timely. However, due to the nature ofVANETs, highly dynamic mobility and frequent disconnection, data disseminationfaces great challenges. Inter-Vehicle Communication (IVC) protocols are the keytechnology to mitigate this issue. Therefore, we propose an infrastructure-lessTraffic Adaptive data Dissemination (TrAD) protocol that considers road trafficand network traffic status for both highway and urban scenarios. TrAD isflexible to fit the irregular road topology and owns double broadcastsuppression techniques. Three state-of-the-art IVC protocols have been comparedwith TrAD by means of realistic simulations. The performance of all protocolsis quantitatively evaluated with different real city maps and traffic routes.Finally, TrAD gets an outstanding overall performance in terms of severalmetrics, even though under the worse condition of GPS drift.

TrAD: Traffic Adaptive Data Dissemination Protocol for Both Urban and Highway VANETs