last I heard I-75 was still both ways in north FL but they have opened up the shoulders to traffic flow. highways near the coasts of FL and GA should be one-way by now.
I've seen governors and mayors on tv announcing phone numbers for those who cannot move themselves out of the path to get free transport. for the remaining who can't manage to make that call or aren't watching the news or weather channel, I've seen footage from prior storms where the cops go down street by street with loudspeakers.