I'm sure a lot of people have been thinking lately, "If I was told to evacuate my house, what would I do?" If the roads were like they are in Texas, would you still try to drive?
Personally, if we couldn't get out by car, I would hoof it. We've got 3 rolling backpacks, and bags could pile on top of the backpacks as they rolled too. We've got kangaroo-type pouches, plus leashes, for the cats. And we've got non-rolling backpacks. So, we could pack up, pack a bunch of non-perishable foods up, pack the tent, and hike to an area where we may be able to find transportation out of there (like a horse!). It'd be hard, but I think we could do it.