Along with advances in technologies and equipment of vehicles with communication devices, vehicular networks were developed. Various applications are proposed and defined for these networks, and as the number of deaths caused by accidents are increasing, safety applications became the most important one. Dynamicity of the nodes in addition to wireless transmission problem cause challenges for disseminating safety data in these networks. One of the main challenges is increasing network congestion while data is disseminating in a geographical region. This paper deliberates the importance of selecting a bounded region for disseminating more precisely to decrease the number of forwarding. This selection depends on geographical placement of roads and information of urban maps such as number of lanes and direction of roads. We have shown that these considerations can reduce region of interest to disseminate a message and consequently the congestion will be decreased.
Vehiclar ad-hoc Networks; Map-based Approach; Data Dissemination; Region of Interest