Decision support system for road trafic management can be used
	for freight transport, people transport but also for site evacuation. We
	deal with two aspects of the decision support system in a same global
	architecture: one for traf¿c regula- tion to avoid jam and the other for
	road users to choose the shortest path in time between two points. These
	two aspects interact. The cartography is represented by a weighted di-
	graph. The weights evolve according to the traf¿c and the graph is
	therefore dynamic. The regulation system is based on a neural network. The
	shortest path is based on an ant algorithm well suited for dynamic
	environments.