Well DUH! This is what happens when you fail to evacuate when there is a manditory evacuation. Gretna was empty. It was the job of the police to stop ANYBODY from coming in.
There does need to be some discussion in lots places that this is what happens when you don't evacuate. You can get stuck.
I will tell you that living as close to Detroit as I do, if I were ever told to evacuate, this computer comes with me.
I guess we just kiss the rest goodbye.
Yeah - but one doesn't expect to get stuck because the town next door closes a public roadway.
I doubt we'll ever grasp the details of the cordon of NOLA - but I suspect not all of the cordon was enforced by feisty neighbors.