I only made it as far as the "Officer Friendly" scene so far, but there's a couple of things I don't understand. First, why was he in such a hurry to get out of the tank? Couldn't he just wait a while for the Zombies to wander off, and then find a better escape route? A lot of the roads were completely clear when he arrived.
Second, what's the advantage of camping out in the open rather than finding a secure place to hunker down? The campers don't seem to be going anywhere; they seem to have created a very vulnerable encampment.