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Old August 24th, 2015, 01:48 PM   #921
VITORIA MAN
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Insane Roundabout by S.A.L., en Flickr
Swindon Magic Roundabout by JJ Willow, en Flickr
Magic Roundabout by terry joyce, en Flickr
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Old August 24th, 2015, 01:51 PM   #922
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Lalik Chowk Roundabout, Lahore





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Old August 31st, 2015, 03:44 AM   #923
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Brazil




Minha Casa Minha Vida em Catanduva (SP) by Blog do Planalto, no Flickr
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Old September 1st, 2015, 09:43 AM   #924
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I still don't understand; what is the idea of those British double-roundabouts? Seems like something mathematically quite difficult and like a traffic-light-hell. Why not to built a large single-carriageway roundabout or an interchange? It can't cost much more and certainly doesn't take so much space properly done.
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Old September 1st, 2015, 07:46 PM   #925
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Quote:
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This looks straight out of a 1960s dystopian sci-fi movie. My God.
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Old September 1st, 2015, 07:50 PM   #926
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I know, so much road, so much houses and no parking anywhere!
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Old September 1st, 2015, 07:54 PM   #927
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None of these houses seem to have any parking...

The Minha Casa Minha Vida programme consists of social housing.

Hasty development, the architect critiques, leads to problems with the new units, that are “almost always of poor quality, on cheap land to increase construction profits, apartments less than 42 square meters, far from centers of commerce and without proper transportation.”

http://riotimesonline.com/brazil-new...-development/#

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Old September 1st, 2015, 07:59 PM   #928
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here's the parking
Minha Casa Minha Vida em Catanduva (SP) by Blog do Planalto, en Flickr
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Old September 1st, 2015, 09:02 PM   #929
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Quote:
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Hasty development, the architect critiques, leads to problems with the new units, that are “almost always of poor quality, on cheap land to increase construction profits, apartments less than 42 square meters, far from centers of commerce and without proper transportation.”
This sentence can easily be the description of the "reconstruction" of L'Aquila after the 2009 earthquake.
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In real life, electronic toll collection was first introduced in Bergen, Norway in 1986, and well into the 21th century many countries still struggle to implement it.
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Old September 1st, 2015, 10:47 PM   #930
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Quote:
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I still don't understand; what is the idea of those British double-roundabouts? Seems like something mathematically quite difficult and like a traffic-light-hell. Why not to built a large single-carriageway roundabout or an interchange? It can't cost much more and certainly doesn't take so much space properly done.
Think positive. The inner circle runs anticlockwise, like the roundabouts in the countries of the right-hand side traffic. Something the people on the Fog Islands always dream about.
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Old September 2nd, 2015, 01:47 PM   #931
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Valence, France

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Old September 2nd, 2015, 05:32 PM   #932
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Nightmare!
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...per un'altra Repubblica!
[...for another Republic!]

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Old September 3rd, 2015, 04:24 AM   #933
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Still didn't get an answer - why do they built giant roundabouts in Britain when you can get an interchange with the same money and space?

Of course roundabouts are much more efficient than normal at-level crossings at fairly low traffic-density-areas - but a double roundabout doesn't seem like it is built for low traffic levels.

About that area in Brazil - I think they've got nothing to park...
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Old September 3rd, 2015, 10:11 AM   #934
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Quote:
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Still didn't get an answer - why do they built giant roundabouts in Britain when you can get an interchange with the same money and space?

Of course roundabouts are much more efficient than normal at-level crossings at fairly low traffic-density-areas - but a double roundabout doesn't seem like it is built for low traffic levels.
It is good to recognize that the UK is the largest outdoor museum in the Europe, and populated by zillions on nimbys. It is hard to reach a consensus to build anything involving a bridge, especially in built-up areas. Therefore, the roundabout is the basic element outside the motorways. If the capacity of a traditional roundabout is exhausted, more creative ideas are welcome.

The basic idea of those magic roundabouts is simple: the inner ring provides with a fast access to the exits at the right-hand size without driving the whole roundabout, thus improving the throughput. However, there is some gap between the theory and the real word: Quite many people say the structure is terrifying. There are not many such roundabouts built.

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Old September 3rd, 2015, 12:01 PM   #935
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Roundabout at Lund - Scania, on Swedens oldest freeway.

From here
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Old September 3rd, 2015, 12:16 PM   #936
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Roundabout at Lund - Scania, on Swedens oldest freeway.

From here
This is rather a typical construction in the UK, and less frequently seen in the continental Europe.
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Old September 3rd, 2015, 01:33 PM   #937
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Well makes sense, this is not continental Europe and they are very common in Scania and I think the rest of Sweden.

Or highway is elevated with the same result, like this new overpass.


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Old September 3rd, 2015, 04:45 PM   #938
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Well makes sense, this is not continental Europe and they are very common in Scania and I think the rest of Sweden.

Or highway is elevated with the same result, like this new overpass.
In my book of geography, even if Scandinavia is a peninsula, it still is part of the continent of Eurasia... :-)

The roundabout interchange has some drawbacks. If the secondary road is elevated, two curved bridges are required. If the primary road is elevated, and it is a motorway, typically there is a need for two short bridges or four long ones.

If the throughput of the secondary road is not an issue, the dogbone interchange is topologically equivalent, and requires one bridge only.

While looking at the new Spillepengen interchange, I am somewhat concerned about the short weaving areas. The diameter of the ring is rather large thus favoring high driving speeds. The length of the three-line weaving area at the west sector is 60 meters only.

Some of the roundabout interchanges in Sweden are badly designed. A few weeks ago, I drove on the exit 111 on E4 (Linköping West) from the west and turned to the north, and felt somewhat uncomfortable.



The area of the interchange is huge, about 60 hectares. It is more than six times more than the area of the newest dogbone interchanges of the new E18 section in Finland. Still, the curvature of the ring may lead to surprises.

The radius of the exit ramp from the west is about 250 meters. No problem with that. But the ramp joins a very short weaving area: The exit ramp leads out of the ring, and those ones turning to the north must suddenly change two lanes to the left within 100 meters only.



However, that is not the last surprise. The left curve is far too tight, its radius is 60 meters only. After surviving that, you are on the lane leading back to the E4. In order to exit the ring to 34 Motala, another lane change is needed, this time to the right.

Compared to that, one of the few such interchanges in Finland (roads 3/12 and 11, Nokia) is more civilized:

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Old September 3rd, 2015, 04:58 PM   #939
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Quote:
Originally Posted by MattiG View Post
It is good to recognize that the UK is the largest outdoor museum in the Europe, and populated by zillions on nimbys. It is hard to reach a consensus to build anything involving a bridge, especially in built-up areas. Therefore, the roundabout is the basic element outside the motorways. If the capacity of a traditional roundabout is exhausted, more creative ideas are welcome.

The basic idea of those magic roundabouts is simple: the inner ring provides with a fast access to the exits at the right-hand size without driving the whole roundabout, thus improving the throughput. However, there is some gap between the theory and the real word: Quite many people say the structure is terrifying. There are not many such roundabouts built.
I'm not sure an interchange would work well for these "magic roundabouts". There seems to be like five or seven different roads coming into the area, with no clear through-route. Typical interchange would only be four roads with at least one clear through route. To handle seven roads you'd have maybe interchange and extra roundabouts

But I really like the magic roundabout idea for its insane Britishness, it's like drinking gin or having bad teeth.
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Old September 3rd, 2015, 07:01 PM   #940
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In Finland roundabouts have worked quite well where needed. Everybody follow the key rule: the one already on the roundabout goes first.

Finland is also a country with millions of nimbys complaining about everything involving a bridge etc, and then you got the Greens, which are the second party in Helsinki and which asses the Right and the Left competitively lick. It is not even near as bad as the UK though, excluding the Greens (no other country in Europe has such problem, except Finland, maybe Germany in some areas and now Spain).

Last edited by RV; September 3rd, 2015 at 07:07 PM.
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