Roundabout junctions

[rawr apples]

Are there any roundabout junctions outside of New England?
Kinds like these

http://maps.google.com/maps?hl=en&q=I93&ie=UTF8&ll=42.419607,-71.103108&spn=0.010201,0.019312&z=16

I love these, but I havnt seen these outside of New England in this country

[deathtopumpkins]

Not that I've seen... They're the same basic design as a SPUI, which seems to be preferred around here.

[agentsteel53]

there are a couple down here in San Diego.  In La Jolla, to be specific.  I also see them sporadically elsewhere.

they're huge in Europe of course.

[Alex]

U.S. 61 and Causeway Boulevard, one of my all time favorite interchanges



Taken 11/20/08.

[Darkchylde]

I've seen a conventional diamond with roundabouts at the ends in Colorado, I-70 Exit 168.

[Alex]

I've seen a conventional diamond with roundabouts at the ends in Colorado, I-70 Exit 168.

You mean this one  :

[John]

Those ones are dumbbells, they are also in Ohio and other places. The only time I've seen the one rawr_apples talked about is in this thread and SC4.

[deathtopumpkins]

I thought they were called dogbones... 

[John]

Yeah I think they are also called that. Who knew, but they are also popular in Ireland. Oh yeah, and before I forget, exit 168 is part of a great road described here

[rawr apples]

ive heard both, but dumbbells is more prevelent I think. and theyre not really like SPUI's, not by a longshot.

[deathtopumpkins]

The one you posted is the same basic concept, if you think of a roundabout as a type of intersection.

[rawr apples]

Still dont get how theyre alike. Roundabouts allow traffic to keep going, and to give way of other cars. SPUI's require all vehicles to stop at certain points

[deathtopumpkins]

I'm talking about the actual interchange. You get off the ramp in the same place regardless of whether it's a SPUI or roundabout.

[Voyager]

I know what he's talking about. There are some in the US, but can't think of where. It's a roundabout placed right on top of an interchange, with the exit ramps leading onto it.

[deathtopumpkins]

I'm saying that both roundabout interchanges like the one rawr posted in the link at the top of the page and SPUIs like this one (that I drove through a lot.. I used to live off that exit) are exactly identical except for the type of intersection on the bottom. Sorry to confuse anyone.

As for the interchange you mentioned voyager, I actually built one of those a while back in SimCity: Actually, I converted it to a diamond and don't have a pic of the original, but here's one from a SC friend: http://img254.imageshack.us/img254/228/southclearviewoct241512sk8.jpg I've heard it called a volleyball too.

[Voyager]

Here you go: http://www.kurumi.com/roads/interchanges/volleyball.html

[deathtopumpkins]

Ahh... kurumi! I have that bookmarked.  Why didn't I look there...

[Alex]

There are two volleyballs that I know of: I-476 and U.S. 1 - http://www.northeastroads.com/pennsylvania001/us-001_nb_at_i-476_01.jpg and Interstate 240 at U.S. 70 - http://www.southeastroads.com/north_carolina050/us-070_wb_at_i-240_01.jpg. Both don't belong to this thread though. 

[Voyager]

Do you know what they're talking about with the roundabout mounted onto an interchange?

[deathtopumpkins]

I'm getting confused now...  So I think it's best to make this my last post on this thread for now.

[rawr apples]

Here is a proper example of what im talking about, this one is in the UK

http://maps.live.com/default.aspx?v=2&FORM=LMLTCP&cp=skx0qzh0x4cg&style=b&lvl=1&tilt=-90&dir=0&alt=-1000&scene=7715118&phx=0&phy=0&phscl=1&encType=1

[Voyager]

Yeah, they have a few of those in the US.

[rawr apples]

Just saying, I've never seen them outside of the North East though..there is one in Arlington,VA

[Alex]

Well the original post was about the rotary based interchanges that are found in New England.



Interstate 93 at Willard Street in Quincy, MA.

The twin-roundabout interchange was mentioned later in the thread, which incorporates roundabouts in place of intersections at the end of the respective off/on-ramps in a conventional diamond interchange.



Maryland 100 Freeway at Meadowbridge Road

[Chris]

they're huge in Europe of course.

Yeah, I had to negotiate 5 roundabouts to drive 1.5 miles in my former neighborhood. I hate them now, there are way too much of them in the Netherlands. They're extremely safe though, due to the slow speed, deadly collisions are rare.