If things do go wrong: lessons learned concerning traffic management during mass evacuation in case of possible extreme flooding in the Netherlands.

By using transport models in case studies for preventive evacuation of coastal and river areas in case of possible extreme flooding many insights have been gained with respect to the modeling of possibilities and restrictions of mass evacuation. Limitation of the road capacity is an important factor in the delay during evacuation. In the case studies several traffic management strategies have been examined. It turns out it is impossible to perform a total preventive evacuation for the coastal area in a realistic 48 hour time span. For river areas it seems possible to complete a preventive evacuation in a realistic time span of 72 hours. The results are based on transport models using the Evacuation Calculator for static and MaDAM for dynamic calculations. It is described which lessons can be learned from these calculations and which extensions can be made to perform improvements with respect to the modeling