The Miami Herald posted this story. Built for bottleneck: Is Florida growing too fast to evacuate ... The article made a good point that I hadn't considered. A good evacuation plan does not require 10 million people to drive 600-1000 miles away. It means driving 10-20 miles inland to a shelter. In south Florida, 10-20 miles inland puts you in the Everglades or Big Cypress Swamp. Those are really bad places to build 10000 shelter buildings, holding 1000 people each. But then I thought of I75. It is an elevated roadway that crosses south Florida east-west. Suppose we told people to drive onto I75 and park on the highway. Just that one highway could park 250000 passenger cars (200 miles * 6 lanes * 5280 / 25 feet per car). Alligator Alley and the Florida Turnpike Could also be used. Perhaps Quonset-hut-like shelters could deploy to shelter the parked cars and to provide services. Maybe not. I'm short on details other than the following two thoughts. A good plan would make use of our highways and private vehicles as resources to help provide the shelter, rather than being part of the problems to overcome. The engineering challenges to make such a plan practical and affordable would be enormous. I suspect that many of my fellow engineers would relish being assigned to the project to think such a plan through, complete the design, then implement it.