it is only 8.1% that live in the 10 largest cities.Obviously, the stats didn't make any sense; the current population of the US is 308 million, if 80% lived in the 10 largest cities, the 10 cities would have to have populations of 25 million each, but the largest city in the US is New York with only 8 million residents.Electronic traffic flow systems would help, but only to a point.