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Old December 21st, 2015, 07:16 PM   #981
ChrisZwolle
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Two-lane roundabouts with a small radius hardly perform better than regular single-lane roundabouts in throughput. It's much better to construct a turbo roundabout, as it will utilize the available capacity better, while also improving safety (more predictable traffic flows).

In my city we have this large traffic circle / roundabout. It performs very well, even at rush hour there are almost no delays despite the traffic volume of 50,000 vehicles on the southeast branch and 30,000 on the northwest branch (and unknown volumes on the motorway ramps).
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Old December 21st, 2015, 08:46 PM   #982
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Old December 21st, 2015, 08:55 PM   #983
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A classic
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I've sold monorails to Brockway, Ogdenville, and North Haverbrooke, and by gum, it put them on the map!
Well, sir, there's nothing on earth like a genuine, bona fide, electrified, six-car monorail!

Marchionne means never having to say you're sorry.

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Old January 26th, 2016, 07:27 PM   #984
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"Roundabout" bridge in Uruguay (designed by Rafael Vinoly).






Yup the one that's been making the news a few days ago....
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Old January 26th, 2016, 07:42 PM   #985
[atomic]
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but why?
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Old January 26th, 2016, 08:59 PM   #986
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[QUOTE=Blackraven;130277726]"Roundabout" bridge in Uruguay (designed by Rafael Vinoly).

This is NO roundabout, for you cannot drive the full circle, nor can you decide turn back. It is just a bridge with an open circle in the middle.
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Old January 26th, 2016, 09:16 PM   #987
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Reminds me a bit of this, except that here you can actually drive the full circle and turn back: https://www.google.es/maps/@38.93565.../data=!3m1!1e3
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Old January 27th, 2016, 08:54 AM   #988
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Interesting setup: https://www.google.es/maps/place/Sev...f018621cfe5648

The roundabout at the W sector of the junction has one entry and two exits. It has two purposes: 1) Motorway access from the local streets. 2) Avoid sharp left turn, and lead the left-turning traffic around the circle.
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Old January 27th, 2016, 11:15 AM   #989
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Originally Posted by [atomic] View Post
but why?
They say it's to prevent high speed and reduce accidents.
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Old January 27th, 2016, 01:30 PM   #990
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It's for the panorama

Quote:
Originally Posted by Highway89 View Post
Reminds me a bit of this, except that here you can actually drive the full circle and turn back: https://www.google.es/maps/@38.9356516,-5.2039259,3634m/data=!3m1!1e3
What is this thing? I wasn't expecting it to be in the middle of a lake in the middle of Spain!

Quote:
Originally Posted by MattiG View Post
Interesting setup: https://www.google.es/maps/place/Sev...f018621cfe5648

The roundabout at the W sector of the junction has one entry and two exits. It has two purposes: 1) Motorway access from the local streets. 2) Avoid sharp left turn, and lead the left-turning traffic around the circle.
I usually call these things "the poor engineer's ramps". I find their usage despicable because they generate all the possible conflicts in the mix of fluxes. It's a really dirty trick to simplify the life of designers, assuming that all the roads involved have the exact same importance, and leaving all issues to the user... with an awful drop in speed and capacity.

Other examples:
https://www.google.es/maps/@45.54663.../data=!3m1!1e3

Seriously?
https://www.google.es/maps/@45.44396.../data=!3m1!1e3
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I've sold monorails to Brockway, Ogdenville, and North Haverbrooke, and by gum, it put them on the map!
Well, sir, there's nothing on earth like a genuine, bona fide, electrified, six-car monorail!

Marchionne means never having to say you're sorry.

Due to Photobucket f*cking up, most images won't be visibile in my old posts. If you need anything specific, please write me.
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Old January 27th, 2016, 02:02 PM   #991
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What is this thing? I wasn't expecting it to be in the middle of a lake in the middle of Spain!
It's the Embalse de la Serena, the second biggest in the Iberian Peninsula.

It seems that the road was built in the late 1980s to replace a former road which eventually was drowned once the reservoir was filled. But I don't really know why it was built that way, to be honest.
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Old March 3rd, 2016, 03:56 PM   #992
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This is the planned traffic light controlled turbo roundabout (or turboplein in Dutch) in Haabersti, Tallinn. It was designed according to the Dutch roundabouts design manual. The only peculiar thing is they've added an overpass for one of the directions:

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Old March 3rd, 2016, 04:07 PM   #993
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That overpass seems to be able to carry traffic in both directions.
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Old March 3rd, 2016, 04:18 PM   #994
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I think everyone's meaning the same thing but something got lost in translation

We might say that the overpass serves one of the fluxes (in both of its directions)?
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I've sold monorails to Brockway, Ogdenville, and North Haverbrooke, and by gum, it put them on the map!
Well, sir, there's nothing on earth like a genuine, bona fide, electrified, six-car monorail!

Marchionne means never having to say you're sorry.

Due to Photobucket f*cking up, most images won't be visibile in my old posts. If you need anything specific, please write me.
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Old March 3rd, 2016, 04:30 PM   #995
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Quote:
Originally Posted by Wilhem275 View Post
I think everyone's meaning the same thing but something got lost in translation

We might say that the overpass serves one of the fluxes (in both of its directions)?
Yes, exactly, my wording was a bit unclear The viaduct will have 1 lane for both of its directions.
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Old May 4th, 2016, 02:16 AM   #996
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A 7-way roundabout in Qatar



Src: http://hors-frontieres.fr/quatar/ (beware, very large photo collection)
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Old June 19th, 2016, 01:25 PM   #997
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Originally Posted by bgdimitrov View Post
This is the biggest intersection in the city of Ruse, Bulgaria.


Because of increasing traffic and danger for pedestrians and cyclists it is now in the final phase of reconstruction and will look like this when complete.
Terribly designed. You have to change lanes to exit.The lines should spiral out so lane changing is naturally done. Here is a much better example.
https://www.google.com/maps/@52.2819.../data=!3m1!1e3

Last edited by scotdaliney; June 19th, 2016 at 01:33 PM.
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Old June 19th, 2016, 02:34 PM   #998
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I don't really see a problem. Your example is more like a turbo-roundabout.
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Old June 19th, 2016, 07:13 PM   #999
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to be honest it looks still poorly set up because they spent all this money for making underpasses in a weird way
they could probably have just made half of them and a bit deeper so straight-through traffic can bypass the rondo and then the pedestrian problem would be solved by less traffic in the circle...
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Old June 20th, 2016, 12:39 AM   #1000
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Quote:
Originally Posted by Verso View Post
I don't really see a problem. Your example is more like a turbo-roundabout.
No it's not, it's just a regular 2-lane roundabout

(also, why does the lane for going right coming from every street have a stopping line? It has it's own conflict-free lane in the drawings... )
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