Your forgetting something about this game obviously.The people in the city aren't the only ones who make up the traffic in the city,its the tourists,other people stoping at your city,people who come to your city for work like industry or the offices.Freight also makes up your traffic,so that could be realistic.People coming from the next door city,from the link of the city.Also one small density could hold dozens of people like you said,thats how some cities are in reality.Oh and just because the population density isn't like New York,it doesn't mean it has to be the same.One residential high rise skyscraper could hold thousands of people,one resdidential medium household could hold hundreds of people,and low residential household could hold like tens or dozens of people.Ive seen in reality in cities with more than 20 people in one household.So cities xl could possibly be realistic like reality.I consider it to be much more realisic than any other city simulation game.Hope this could of helped.=)
