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Old October 8th, 2013, 04:26 PM   #9921
ChrisZwolle
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The difference between a regular turbo roundabout and a mega turbo roundabout is that you have to give way to more than 2 lanes. The mega turbo roundabout is traffic light controlled for that reason.

A throughput of 11,000 vehicles per hour is possible, depending on the exact layout (number of lanes).

pros:

* higher capacity than a regular turbo roundabout
* requires less space than a traditional traffic circle
* lower speeds, resulting in much better safety than traffic lights
* two-phase traffic lights possible instead of branch-per-branch

con:

* requires very good signage and road markings
* unconventional design
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Old October 8th, 2013, 04:26 PM   #9922
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Quote:
Originally Posted by Surel View Post

It would be interesting to see an actual computer traffic flow simulation on it.
Indeed!
Quote:
Originally Posted by ChrisZwolle View Post
pros:

* higher capacity than a regular turbo roundabout
* requires less space than a traditional traffic circle
* lower speeds, resulting in much better safety than traffic lights
* two-phase traffic lights possible instead of branch-per-branch

con:

* requires very good signage and road markings
* unconventional design

How is it compared to an improved ( enlarged) classic traffic light controlled intersection though ?

Also, what about the time to clear such an intersection ? Cars are stuck much longer on this massive roundabout than on a classic intersection ?

Can you elaborate/explain how the traffic light phases work ?

Da_scotty says sharp turns are a disadvantage on a classic intersection ( so low speed), and you call it an advantage of this turbo roundabout... Which one allows higher speeds then on average ?

Last edited by snowdog; October 8th, 2013 at 04:32 PM.
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Old October 9th, 2013, 12:35 PM   #9923
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Quote:
Originally Posted by ChrisZwolle View Post
The difference between a regular turbo roundabout and a mega turbo roundabout is that you have to give way to more than 2 lanes. The mega turbo roundabout is traffic light controlled for that reason.

A throughput of 11,000 vehicles per hour is possible, depending on the exact layout (number of lanes).

pros:

* higher capacity than a regular turbo roundabout
* requires less space than a traditional traffic circle
* lower speeds, resulting in much better safety than traffic lights
* two-phase traffic lights possible instead of branch-per-branch

con:

* requires very good signage and road markings
* unconventional design
This design still doesn't make sense. Once the junction get signal controlled there is no point left in channelling all flows of traffic through individual and segregated carriageways. A signal-controlled conventional roundabout achieves exactly the same throughput. Yet, it avoids the sharp bends which this turbo-roundabout implies.
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Old October 9th, 2013, 01:36 PM   #9924
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N236 Weesp

Replacement of the N236 Weesp Bridge in one night.

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Old October 9th, 2013, 06:16 PM   #9925
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Quote:
Originally Posted by flierfy View Post
This design still doesn't make sense. Once the junction get signal controlled there is no point left in channelling all flows of traffic through individual and segregated carriageways. A signal-controlled conventional roundabout achieves exactly the same throughput. Yet, it avoids the sharp bends which this turbo-roundabout implies.
This is what I'm thinking.
Traffic lights defeat the whole point of a (turbo)roundabout.

Zuid Holland is probably the worst of all in terms of provincial roads overall ( in particular Rotterdam and its surroundings), speedbumps on through roads and generally a network that will not function at all without the motorways, it's just there to feed traffic into motorways or residential areas. Now these massive silly traffic light controlled turbo roundabouts.

I think a classic intersection with traffic lights, with enlarged (longer, and perhaps more) turning lanes, and bypasses for right turns ( eg. turn right without traffic lights and merge in after turning right) is FAR superior speed wise, capacity wise, and efficiency wise.
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Old October 9th, 2013, 09:47 PM   #9926
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A59 knooppunt Hooipolder

The Hooipolder motorway-to-motorway interchange features traffic lights and is due for replacement later this decade. The traffic lights were destroyed this evening during an accident.

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Old October 10th, 2013, 04:05 PM   #9927
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traffic congestion data

Rijkswaterstaat published a new report about rijkswegen (trunk roads).

Traffic congestion development, as measured in length * duration (= filezwaarte).


mileage on the trunk roads.
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Old October 10th, 2013, 09:09 PM   #9928
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About the portion of the A9 motorway between the Bodhoevedorp and Raasdorp interchanges, would the new 2x3 alignment between those interchanges result in the removal of the existing 2x2 alignment?
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Old October 10th, 2013, 09:15 PM   #9929
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Yes, the existing motorway will be demolished. The Badhoevedorp cloverleaf interchange will be completely reconstructed. It will become one of the most complex interchanges in the Netherlands (though not a high-level interchange).
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Old October 11th, 2013, 11:05 AM   #9930
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Chris, how low do you expect the eventual delay to be? Especially with the "Rotterdam Upgrades" still in the pipeline.
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Old October 11th, 2013, 03:04 PM   #9931
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That is dependent on economic growth, but it seems clear that per capita driving has more or less maxed out, so most traffic growth will come from population growth, which is projected to be low to stagnant over the next few decades.

Traffic has been stagnant in rural areas, but most growth is on the motorway network. They plan to construct over 100,000 new houses around Amsterdam in the next 25 years, so growth will likely continue in western and central Netherlands.

Then there will always be a substantial base level of congestion, caused by accidents, weather and a few remaining bottlenecks.

Fears that expanding motorway capacity would be useless due to lack of urban arterial capacity turned out to be unfounded though. Individual stretches which have been widened saw a reduction of traffic congestion of over 90%, leaving just irregular congestion due to accidents and weather (snow).
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Old October 11th, 2013, 04:20 PM   #9932
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A16 Rotterdam - Breda

The speed limit on A16 will be raised from 120 to 130 km/h between the Moerdijk Bridge and the Zonzeel motorway interchange (A59) in both directions. This will harmonize the speed limit with the segment further south, which will result in a 130 km/h speed limit throughout the Noord-Brabant province. This rural segment of A16 has 2x3 lanes and an AADT of 112,000.

Procedures for raising the speed limit have been initiated. It is unclear when the speed limit will actually be raised to 130, but it appears to be a matter of months.
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Old October 11th, 2013, 05:47 PM   #9933
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I remember when the limit as 100 after the bridge
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Old October 11th, 2013, 05:51 PM   #9934
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Yes, it was raised from 100 to 120 a year ago. This is the next step to uniformize as many stretches to 130 as possible.
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Old October 12th, 2013, 12:26 PM   #9935
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N295 Greenportlane, Venlo

The "Greenportlane" opened to traffic yesterday. The Greenportlane, also known as provincial road N295 is a 2x2 dual carriageway with turbo roundabouts and an 80 km/h speed limit. It runs from N556 to A73 northwest of Venlo. Construction cost was € 71.5 million.

The Greenportlane (Dunglish) will serve as the primary route to a new commercial area to be developed over the next 30 years. The area will be developed as an agriculture and horticulture processing center. It is strategically located near two motorways (A67 & A73) and it can reach the German hinterland within minutes (A40 to Duisburg and A61 to Koblenz).

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Old October 13th, 2013, 08:38 PM   #9936
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N260 + N261 Tilburg Ring Road

The northern part of the Tilburg Ring Road was completed in 2012. It's a divided highway with traffic lights. The western half is numbered N260 and the eastern half is numbered N261. Tilburg is the sixth largest city in the Netherlands.

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Old October 13th, 2013, 08:43 PM   #9937
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at Not worth mentioning and at the end

Nice video again! :thumb:
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Old October 14th, 2013, 12:28 AM   #9938
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Quote:
Originally Posted by ChrisZwolle View Post
The "Greenportlane" opened to traffic yesterday. The Greenportlane, also known as provincial road N295 is a 2x2 dual carriageway with turbo roundabouts and an 80 km/h speed limit. It runs from N556 to A73 northwest of Venlo. Construction cost was € 71.5 million.

The Greenportlane (Dunglish) will serve as the primary route to a new commercial area to be developed over the next 30 years. The area will be developed as an agriculture and horticulture processing center. It is strategically located near two motorways (A67 & A73) and it can reach the German hinterland within minutes (A40 to Duisburg and A61 to Koblenz).
This is near the site of former Floriade, right?
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Old October 14th, 2013, 12:44 AM   #9939
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This is near the site of former Floriade, right?
That is correct.
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Old October 14th, 2013, 05:44 PM   #9940
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A1 Diemen - Almere

A must-see video about the upcoming A1 widening that will start next year.



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