1.5.2 Frequently changing topology The topology changes frequently and rapidly due to the fast-mobility of wireless nodes The high speed of mobile nodes directly affects the lifetime of links among wireless nodes, especially the links between two opposite direction nodes Since the roads limit the mobility of nodes, links among vehicles with the same direction on a road usually perform much more stable than that among vehicles with opposite directions1.5.2 Frequently changing topology ◼ The topology changes frequently and rapidly due to the fast-mobility of wireless nodes ◼ The high speed of mobile nodes directly affects the lifetime of links among wireless nodes, especially the links between two opposite direction nodes ◼ Since the roads limit the mobility of nodes, links among vehicles with the same direction on a road usually perform much more stable than that among vehicles with opposite directions