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I wanted the challenge of emulating a micro city-state like Monaco, but with the caveat of "not getting along with the surrounding country". So, using a map similar to the coast of the state of São Paulo (Brazil), I created a modern walled citadel in a one-tile peninsula that is self-reliant on food and fuel, therefore, imune to sieges.
Traffic flow: 81-83% during the day, 86-89% during the night
Budget: sustained by the special industries
Population: 19.500-20.500, the amount I calculated the tonnage of food the city produces to feed.