Lo de construir grandes carreteras es todo un arte. En este artículo recopilan varios de los diseños usados por los ingenieros para que los conductores puedan realizar cambios de dirección. Con alguno de ellos seguro que te topaste en alguna ocasió…

This post was mentioned on Reddit by mooseclamps: I live near where it’s going to be built, knowing how bad the drivers are here… I do not look forward to it….

Also, now I know what a spooey is! There are two in Bloomington, MN (well, between Bloomington and Richfield, spanning Interstate 494) and a third under construction. The first was 24th Street, redone to carry the anticipated new traffic loads when the nearby Mall of America opened. (It’s performed beautifully, BTW.) Several years later, the Penn Avenue bridge was demolished and replaced with a SPUI as part of the lead-in to Best Buy moving its headquarters to that location. (Basically, they were closing the roads *anyway*, so it was a good opportunity.) Now they’re working on doing the same on Lyndale Avenue, which probably needed it the most.

I used to call these “asterisk bridges” because they kind of resemble one from overhead. At first, I found them strange, but they really weren’t confusing. They’re actually pretty slick.

http://www.parsons.com/Media%20Library/1208_Dubai.pdf

http://en.wikipedia.org/wiki/File:Dubai_Roads_on_1_May_2007.jpg

http://archive.gulfnews.com/articles/07/05/10/10124218.html (scroll thru the photos)

…or just zoom in on Google Earth……

The original Lofthouse interchange, like many others of the same design (M25/A2, M25/A20, M62/M57) has more recently had by-pass lanes added allowing some turning traffic to by-pass the roundabout altogether.

There’s a good reference site for UK road interchanges at: http://www.cbrd.co.uk/reference/interchanges/

this is the best comment I could make, but done visually. I love good and well thought infrastructure that builds a strong foundation for the future. Modern Highways and especially interchanges are very rarely in this category.

http://www.youtube.com/watch?v=IxjVFhEm7iM

Really awesome set of posts, and site. Thumbs up.

Form follows function, IIRC.”

I think you missed his point entirely, Mrsizer. What he was saying is not that they aren’t apt for their function, but rather they don’t play well with others. Not everyone trying to get around a city is in a car but some of these interchanges effectively crowd out all other transportation routes and modes. He’s remarking on the balance, or lack thereof, of some transportation infrastructure. If you need to go to a place a half a mile down the street (to a place you can see from where you are) but to do so you effectively need to either buy a car or walk 10 miles around, then that might be an indication of a problem of balance.