illustrates an application overlay functioning within a VANET, in which the overlay network is mapped onto the physical network. Thus, the overlay node placement is logically different to that of the physical placement of the nodes. We simulate a mesh architecture with all-to-all connectivity [7](Fig. 2). This approach is more robust than a tree-based architecture, because, when a stream comes from various sources, communication does not break down when a subset of peers disconnects. In the example scenario illustrated, seven nodes form a mesh within which two nodes are the original source nodes for the same video. A likely way that two nodes in a VANET could acquire the same video clip is that both could have passed a roadside unit offering informational/advertising video clips. However, it is also possible that these two nodes previously