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The name of the 3rd place was Gas Town.
That's what I was saying was the answer to the high use of cars in this movie, considering in The Road Warrior, there was a shortage of gasoline. You had three dominate communities. One controlled water, the other controlled gasoline and the other controlled bullets. Someone was disappointed in the lack of backstory, but it was easy to figure out that these three communities traded with each other and were all vital to each other's existence in this type of world. Sometimes there is nothing wrong with letting the viewer use his imagination about the backstory by giving them just enough info about what happened..