Many agglomeration are faced to multiple technological and
		natural hazards. The use of the road traffic by vehicles may cause big
		problems especially under evacuation situations. An accident on a main
		road may endanger many lives. A household survey was conducted in CODAH
		about people displacement in the Seine estuary. In this paper, we
		extracted and treated the survey result. We also compared results with
		a detection of organizations in large graphs algorithms.