Community shelters would mainly work in town, in shopping areas, or wherever there are high numbers of people, which is fine. But it wouldn't be realistic to think people should try to get to them from outside the fairly immediate area. Tornadoes aren't that predictable, and can wipe you out on the road, esp in the dark, lightning or not.

Six sqft per person, almost 30x30"... I feel my claustrophobia flaring up...

Sue