It seems as if each state has a different style for their interchanges. California tends to build big: fivelevel stacks, and multiple freeways meeting at the same point providing for larger, higher, and more complex interchanges. Texas has its ubiquitous frontage roads, and almost exclusively builds fourlevel stacks for freewaytofreeway connections. Michigan tends to be innovative, coming up with designs that work well on paper but arent always the best in the real world. In the northeast, things are done differently; New Jersey just takes a standard cloverleaf and adds enough extra ramps to get the job done; of course, it has the Jersey Freeways where business get direct access to a road with no stoplights, too.

Website: http://whereroadsmeet.8k.com/