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The articles in this special issue focus on advances in vehicular communications networks. The first four deal with the refinement of several different important mechanisms in vehicular communication protocols, with the aim of controlling and reducing the overall network offered load, while guaranteeing a good level of accuracy, efficiency, and security. The last article proposes a system architecture, called VISIONS, that makes use of the 3G network to disseminate control information. The control information helps routing protocols improve their route selections.