I hope this isn’t a detraction from the OP’s point,but I wonder if we all know our cities disaster plans, and how the problem would be solved.
Chicago and all large cities would have to move thousands if not millions out of the area; what plans are there in place should a dirty Bomb or other disaster happen? Each citizen should ask their representatives and also have a family plan.
A lot of what happened in New Orleans could have been avoided if people knew the plan ahead of time,then those who had no transportation would know what to do,and could have escaped to a safer area away from the storms path. When they heard the possibility that a Hurricane could hit, they should have been able to know there was transportation out and away from the city.
City and school buses, large vans etc. should have been made available to take people supplies and pets to a safe area before the hurricane hit
If a terror attack took place it would require another plan, as it would be difficult to just get away before the disaster hit.
Monavis