Within a very short time I'm sure there would be radio broadcasts advising people where emergency shelters/aid stations are located. And since there are only so many main arteries in and out of cities I imagine most people would use the most obvious routes like freeways and interstates where traffic could easily be blocked or diverted by authorities. Not saying it would be well organized but there would be some order within the chaos. And if things got truly out of whack, wouldn't it be more likely people would head for super wal-mart and other big box/grocery stores rather than homes? As long as you're not a parking lot security guard you should be okay.