Transportation systems are backbones of urban life serving thousands of people everyday, creating potential targets or environments for terrorist attacks which aim to put fear in people's minds and disrupt daily lives. Even if not targeted directly, better management of transportation systems are crucial after terrorist attacks, which may reach a disaster level, especially, if it includes CBRN elements. Evacuations are massive operations that require transportation of a large number of people outside a disaster zone and generally take place simultaneously with emergency operations. Thus, the need and main aspects of an evacuation traffic management methodology that includes an integrated look at different traffic flows and network management strategies is discussed in this paper.