One of the SurvivalBlog concepts that has fascinated (and haunted) me since learning of it has been the concept of the Golden Horde: the exodus of the unprepared-but-entitled softies, fleeing the cities in search of food, water and shelter after a SHTF scenario.
I say “haunted” because – out of necessity – my retreat lies in the middle of a triangle formed by three medium-size cities, so I’ve long suspected that I would be in prime Golden Horde country.
In order to understand what such an exodus might actually look like, I decided to make some assumptions about travel behavior and then superimpose those assumptions onto a map. I wanted to model something that I could actually prepare and plan for, rather than just worry about an invisible foe.
My nephew runs an instant oil change shop, and several months ago – when I first started reading SurvivalBlog – I asked him to begin noting the average amount of gasoline customers had in their tank when they brought them in.
This isn’t in any way scientific; I just wanted some sort of information to base my assumptions on. After about two months of watching, my nephew reported that the average is somewhere between 1/3 and 1/2 tank of gas.
I had assumed, if graphed out, it would probably be a bell-curve with a few people having a full tank and a few people running on fumes, and everyone else hovering somewhere around the middle. So I was a bit surprised that the average seemed to be quite a bit below half. I told this to a gas station owner friend of mine, and he said he wasn’t surprised. He said nowadays people tend to just buy gas as needed (usually in even dollar amounts), and rarely “fill it up”.
For my assumptions, I will say that most people have a gas tank that’s 40% full.
As for average gas tank size on the road today, I basically had to trust the web for this one, and most of what I read put the average at between 14 and 16 gallons. I decided to split the difference and say 15 gallons.
A 15 gallon tank that is 40% full contains 6 gallons.
According to web sites that track such things, the average highway MPG of the 20 most common new vehicles on the road is 22 MPG. This does not account for all the used vehicles on the road. Also, I couldn’t find average city MPG figures, but judging by the typical relationship between highway and city MPG, I’m assuming that the stop-and-start driving of a mass evacuation would be even worse than typical city driving, and would certainly offer no more than 18 MPG. I think 18 MPG would be generous.
Furthermore, after a genuine SHTF scenario, gas stations will be sold out within minutes, so for most people, additional gasoline above and beyond what they already have in their cars will simply not be an option. Which means that – to my surprise – after TSHTF, the majority of drivers fleeing the city will travel not much more than 108 miles before having to proceed on foot.
Based on disasters like Katrina and others, I assume at least 20% of the city will stay behind to try to make a go of it, and 80% will flee. Who knows if that will be accurate. Perhaps as many as half will stay behind, but for me, I used 80% as a kind of worst-case assumption.
Now, I had to formulate some route assumptions. These will vary from city to city, and you’ll have to arrive at your own assumptions about this, but in my particular area, here is what I’ve come up with: 70% of people will (try to) use interstates, 25% will use state highways and 5% will use rural and secondary roads.
I’ve further assumed that the city will disperse in all directions. In other words, there is no compass point that will be particularly favored. This may not be true everywhere, but in my area, there’s no real or perceived advantage to heading East vs. West for example.
I’ve been informally observing interstate traffic patterns in my area (something I’d advise you to do as well) and about 1 in 17 cars (say 6%) make a turn from the road they’re on to any given side road or exit.
In other words, if you start at some random point with 1,000 cars, at the next off-ramp, about 60 will exit, leaving 940 on the road. At the next exit, 56 cars will get off or turn and 884 cars will continue on the interstate.
In normal day-to-day life, cars also get on the interstate at these places too, but I suspect that in a genuine SHTF scenario, people who are already out of the city will be less somewhat less likely to join the extremely slow, Golden Horde on the interstates.
Again, trying to get accurate figures for these things is obviously extremely difficult, and who knows if these figures will hold after SHTF, but by erring on the high side of things, you can at least have something to plan for.
So armed with these assumptions, let’s now apply them to a roadmap.
Go to Google Maps and pick the major city that’s nearest your location, and multiple the population by .8 (or whatever your assumption is on how many people will be bugging out).
Now, distribute those people along all the outbound interstates, state highways and secondary roads according to your assumptions. (In my case, 70% interstate, 25% state highways, 5% secondary.)
Then follow each route that heads in your general direction, losing 6% at each exit, or intersection and continuing with this until you get about 110-120 miles. These are the locations where people are going to congregate and decide what to do next.
From here, these groups will disperse in a more scattered way (since they’re on foot), with perhaps 20% choosing to take exits and side roads, a few even going cross-country in search of something to eat.
Be sure to repeat this for other nearby cities, and when you’re finished, you should have a (very) rough idea of the number of hungry people who may be descending upon your area. The accuracy of these figures will be entirely dependent on the accuracy of your assumptions, but hopefully it will aid in your planning.
Prior to doing this experiment, I had a vague uneasiness about this issue, but now I know that there will be about 2,200 refugees that will pass directly in front of my property gate on foot, with some percentage of those probably daring to walk the mile-long driveway to my house. I’m still uneasy about the situation, but at least now it feels like a manageable problem instead of an unknown bogeyman. – Rex J.