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Vehicular Ad-hoc NETworks (VANETs), a special kind of Mobile Ad-hoc NETworks (MANETs), where wireless-equipped (road) vehicles form a network without any additional infrastructure. Due to the fast growing number of vehicles and saturation of the transportation infrastructure traffic congestion, accidents and transportation delays become unavoidable. Several measures are implemented in order to solve these problems and construction of more and better roads and highways and to develop safety applications like accident notification, traffic congestion warning and traffic congestion avoidance that lead to a significant reduction of critical traffic events. These applications utilize a variety of data obtained from the host vehicle, the road and surrounding vehicles. The information must be transmitted immediately with high reliability and low delay.
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