Ok, a freind and I sat on the deck and spent some time contemplating a zombie apocolypse this weekend (children played in the yard and we threw back some beers, but I digress). We live in the western suburbs of Philadelphia and assumed the worst case quick spreading end of the world type zombie scenario.
Philly has about 1.4 million in it. We figured worst case 1/2 the population turns zombie, the other 1/2 dies outright or flees. That's 700,000 zombies expanding out of the city after the initial outbreak, when we assumed we would know what's going on and possibly have seen some zeds in our area. We dig in. Generator, enough gas for several days with minimal usage, food, 10,000ish rounds of ammo for various firearms, tools, vehicles, etc.
Now we make some assumptions. Most of the zombies move north out of the city, because there are rivers on 3 sides of the city and less will cross bridges than wander up open streets. Once they are at the north city limits they can go west, north, or northeast with most roads funneling north and northeast. We assumed 1/4 go west towards us. 175,000 zeds heading west. At this point we figure we live on the wrong side of the river. We also make the assumption that as it the horde will remain the same size (losses will equal new zombies). We are 30 miles from philly and guessed zombie horde travel at 10 miles per day.
Based on this we figure we can't stay. The plan has to be "bug out". So let the initial panic die down over 2 days, deal with local zombie threats and then bail. So out planning is now, after the social collapse, how to se move families overland and where. To be continued...