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Old June 20th, 2016, 01:05 AM   #1001
Verso
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Quote:
Originally Posted by keokiracer View Post
No it's not, it's just a regular 2-lane roundabout
The one in scotdaliney's link is a turbo roundabout.
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Old June 20th, 2016, 01:15 AM   #1002
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N80 X E313- all roundabout removed. Traffic jams reduced a lot here. There is one lane extra and more turning lanes. 2 lane roundabout clogged everything. Obviously no place for a propper turbo roundabout. I don't think there is any turbo at all in Belgium. We're still stuck in the 80ties!

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Old June 20th, 2016, 01:15 AM   #1003
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Quote:
Originally Posted by Verso View Post
The one in scotdaliney's link is a turbo roundabout.
Nope, as a turboroundabout requires seperated lanes on the roundabout.
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Old June 20th, 2016, 09:28 PM   #1004
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Quote:
Originally Posted by keokiracer View Post
Nope, as a turboroundabout requires seperated lanes on the roundabout.
I think it's a hybrid. You have to change lanes to stay and keep driving in the roundabout. This one is similar (and even less turbo):
Quote:
The turbo roundabout was formally developed in 1996 in the Netherlands by Lambertus Fortuijn, a researcher from the Delft University of Technology.[55] Similar roundabouts, with spiralling lane markings, have been used for many years in the UK e.g. the A176/A127 (eastbound) at Basildon, Essex (51.561399°N 0.452934°E).
https://en.wikipedia.org/wiki/Rounda...bo_roundabouts
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Old June 20th, 2016, 10:51 PM   #1005
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The point of the turboroundabout is that you don't have to/can't change lanes on the roundabout. I think it's more likely that it's regular-multilane-based than turboroundabout-based.
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Old June 20th, 2016, 11:21 PM   #1006
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Quote:
Originally Posted by keokiracer View Post
The point of the turboroundabout is that you don't have to/can't change lanes on the roundabout. I think it's more likely that it's regular-multilane-based than turboroundabout-based.
You don't have to change lanes in that roundabout. As for "can't": yes, you can easily change lanes in this roundabout, but theoretically you can keep driving in every (turbo) roundabout. Many turbo roundabouts don't even have physically separated lanes, just lines drawn between them.
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Old June 21st, 2016, 12:01 AM   #1007
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Quote:
Originally Posted by Verso View Post
Many turbo roundabouts don't even have physically separated lanes, just lines drawn between them.
Then it's not an official roudabout but a 'copycat' version. The official turboroundabouts need dividers.

I feel like we're talking about 2 different things here, is there another type of turboroundabout besides the 'Dutch turboroundabout'? Cause the big English ones are just big roundabouts. We in NL for example don't call the Joure interchange a turboroundabout.
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Old June 21st, 2016, 12:37 AM   #1008
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Quote:
Originally Posted by keokiracer View Post
Then it's not an official roudabout but a 'copycat' version.
Or a pre-turboroundabout.

Quote:
Originally Posted by keokiracer View Post
I feel like we're talking about 2 different things here, is there another type of turboroundabout besides the 'Dutch turboroundabout'? Cause the big English ones are just big roundabouts. We in NL for example don't call the Joure interchange a turboroundabout.
I don't know, but this is what it says in Wikipedia:
Quote:
Turbo roundabouts in continental Europe were initially built with raised lane separators. Newer implementations follow UK practice with only lane markings increase efficiency (regarding safety, speed and capacity) by reducing the safety risk and enabling maintenance vehicles such as snow ploughs.
https://en.wikipedia.org/wiki/Rounda...bo_roundabouts
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Old June 21st, 2016, 08:24 PM   #1009
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Quote:
Originally Posted by Verso View Post
Or a pre-turboroundabout.

I don't know, but this is what it says in Wikipedia:https://en.wikipedia.org/wiki/Rounda...bo_roundabouts
There is a distinction between a standard multi-lane roundabout. Where either the lanes are predefined all the way round. No lane changing needed.
https://www.google.com/maps/place/Jo...5.766111?hl=en

Then multi-lane roundabouts where to exit, you first have to change lanes from the inside lane.

Then the spiral marked multi-lane. Where the marking natuary take you to the outside lane. roundabout.https://www.google.com/maps/place/Re...97!4d-1.940936
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Old June 21st, 2016, 09:08 PM   #1010
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Quote:
Originally Posted by scotdaliney View Post
There is a distinction between a standard multi-lane roundabout. Where either the lanes are predefined all the way round. No lane changing needed.
https://www.google.com/maps/place/Jo...5.766111?hl=en
This is a dangerous roundabout.
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Old June 21st, 2016, 09:11 PM   #1011
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Those seem like 'race-through' roundabouts. Perhaps efficient to handle large traffic volumes, but not that much safer than an (un)signalized intersection.
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Old June 22nd, 2016, 06:25 AM   #1012
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Quote:
Originally Posted by Verso View Post
This is a dangerous roundabout.
It's a very standard Australian roundabout. There are thousands in that section of the city alone. Australia tends to be very uniform in its road building. Almost every multi-lane roundabout is identical to this.
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Old June 22nd, 2016, 02:14 PM   #1013
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I remember them mostly with full lines drawn, so that you weren't allowed to keep driving in the outer lane, you had to exit.
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Old June 22nd, 2016, 02:37 PM   #1014
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Quote:
Originally Posted by Verso View Post
I remember them mostly with full lines drawn, so that you weren't allowed to keep driving in the outer lane, you had to exit.
You can't drive around the outside lane. If you look at the arrows the outside lane can only turn left or go straight.
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Old June 22nd, 2016, 09:01 PM   #1015
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Quote:
Originally Posted by scotdaliney View Post
It's a very standard Australian roundabout. There are thousands in that section of the city alone. Australia tends to be very uniform in its road building. Almost every multi-lane roundabout is identical to this.
I know that roundabout. It is indeed dangerous and should be replaced with traffic lights or reconfigured to a turbo - roundabout.
Traffic on the roundabout travels way too fast and sometimes you can be waiting for ages to get on. Not a good design, and indeed way too common in Australia.
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Old June 22nd, 2016, 09:14 PM   #1016
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Quote:
Originally Posted by scotdaliney View Post
You can't drive around the outside lane. If you look at the arrows the outside lane can only turn left or go straight.
Yeah, if you look at arrows, you're right, but lines aren't so clear (although they suggest leaving the roundabout). For example, in Slovenia such arrows are just a recommendation (edit: I might be wrong), but you may still drive around on the outside lane (unless there's a full line drawn). I guess Australians know how to drive in this roundabout, but foreigners may be confused.

Last edited by Verso; June 22nd, 2016 at 09:29 PM.
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Old June 23rd, 2016, 02:47 PM   #1017
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Roundabouts only really work at junctions where there is a lot of turning traffic. We have loads of roundabouts in England...and I generally like them, but the worst ones are very small with a straight line dominant flow which makes turning onto them very hard an because they are small there isn't much space to pull out etc.

This is my least favorite roundabout! https://www.google.com/maps/@53.2593...!3m1!1e3?hl=en
Very busy, very small and an awkward shape!
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Old June 23rd, 2016, 03:51 PM   #1018
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It's not very clear to me why they have 3 arrows (left, straight and right) there. In a roundabout there are only 2 directions (straight and right).
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Old June 23rd, 2016, 08:03 PM   #1019
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^ Because some people like driving in roundabouts in wrong direction (witnessed by my sister today ).
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Old June 23rd, 2016, 11:04 PM   #1020
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Quote:
Originally Posted by g.spinoza View Post
It's not very clear to me why they have 3 arrows (left, straight and right) there. In a roundabout there are only 2 directions (straight and right).
If you want to take the third exit of that roundabout, you take take the lane with where the arrow is two the right.
So the arrows indicating how you would turn at a normal intersection, that's why there is a "wrong directing" arrow.
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