We have them in the states too... visit some small towns.. supposedly they have put them back in larger cities as well. They were common in the early 1900's.
Visit south 4th and I70 in Columbus some time, try to figure out how to get from 4th TO 70.

One of those, you can see it... but...
Same thing in Detroit, see the freeway but getting there is the trick. Labret should have chimed that one in. We had to get a girl in an ice cream truck to take us down to the freeway there years ago after circling about 20 times.
