In a situation where national infrastructure and life sustaining resources are suddenly cut off , population density will have a lot to do with how well you get by in the days following the crisis. When it happens, what you have on hand will likely be all you have to work with for an extended time. Those that lack supplies will seek out and take what they need in an increasingly hostile manner as time goes on. This is why being in a large city will likely be hazardous to your well being.
Very few will argue that being in a rural area when something catastrophic happens will greatly increase your chances of survival. A lower population density and more available natural resources to help you get by will make long term survival much easier. This is why so many people advocate heading for a rural area when something happens. The problem is unless you are already established in a rural area, survival will not necessarily be easier.
Leaving the city when supplies and infrastructure are shut down would work only up to a point. Rural areas are like anywhere else. They have infrastructure designed to service a certain number of people that normally live there. The housing, restaurants, roadways, water systems and grocery stores will only handle a small excess of people even in the best of times. When the city dwellers suddenly evacuate to the rural areas in mass, they will simply be taking many of their big city problems with them. They will likely find no housing, food supplies or other infrastructure they need to live.
Because of this many small towns will likely close their roads at some point and prevent entry to anyone who does not live there. They will suddenly realize their already finite resources will not be enough for themselves much less thousands of new people.
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