In a storm this big, boards don't do much either. They help protect the glass from wind, but if there's anything being blown by the wind, forget it. The big tape X's are only of any value if you're staying IN the house and if you don't have any kind of film on the glass. Most windows nowadays have a UV filter pre-installed, so they wouldn't shatter anyway. As to traffic, leave as soon as you can afford it. The drive will just take longer and longer as more time passes. Not to mention it will be easier to get supplies from the local stores there before all the other evacuees start showing up and raiding the shelves.