Mass evacuations are a monumental undertaking. As was apparent in New Orleans, they are not just about moving people from one place to another. They require equipping shelters with appropriate food and medical supplies, ensuring that security forces are where they are most needed, engineering traffic routes out of the region to prevent gridlock and, of course, educating the public so they know when and where to go.
And even with all that planning, some residents may still refuse to leave. What lessons does the Katrina evacuation hold for the future?
Laura Sullivan, NPR reporter
John Sorensen, distinguished researcher at the Oakridge National Laboratory in Oakridge, Tenn.
Guy Daines, former emergency management director for Pinellas County, Fla.
Fred May, professor of emergency management, Jacksonville State University in Alabama