Abstract
During a disaster warning phase or when a disaster strikes, controlling traffic flows on the road and street network is the major element in the r escue system. Unfortunately, in an urban environment, any risk is worsened by the risk of the arteries being congested, that risk being inherent to urban operation, and being amplified by transfer of traffic on the approaches to the disaster site. The vulnerability of urban zones is thus largely dependent on how vulnerable the road and street network is to traffic paralysis. Starting from this observation, we have created a tool for assisting in managing the intra-urban traffic in times of risk, that can be used by any urban municipality wishing to simulate a disaster