Yeah man I always tell people to buy a good road atlas and map out routes that avoid all interstates in case of an emergency situation like this, it's important to always have a backup "safe route" for various scenarios. In a state of emergency an interstate can be suicide for many reasons. I first learned these tips when I was serving in the Army. I had the joy of being stationed in Fort Polk LA during Katrina, and after that our brigade commander wanted us to be prepared to find "alternative routes" to get back to Post in case of an emergency situation where the interstates or other major highways are closed down or otherwise inaccessible.
I've even taken "practice trips" for example I can get from my ranch in Colorado to my parents' house in Chicago without ever touching an interstate, taking mostly county backroads and old US Highways. It takes a
little longer but not much, and it's a lot safer in an emergency situation. Safer for avoiding traffic stops, too, I've noticed