Birdseye view : map of realistic metropolitan area One major city and five surounding towns Major city must have a downtown, and a few neighbourhoods ( about 3 million inhabitants ) Connect the bigger town with 2 two ways three lines highway and smaller one with two way roads Connect the major to a small city on the other side of the river with a sizeable bridge Make sure there is train network , a one taxiway aeroport and a cargo port visible Try adding a few forested areas and one big Mehr sehen