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Old March 7th, 2015, 01:43 PM   #12201
ChrisZwolle
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Large turbo roundabouts in Westland municipality.





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Old March 7th, 2015, 01:59 PM   #12202
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Such roundabouts are called in Hungary as 'Dutch Roundabout'.
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Old March 7th, 2015, 05:35 PM   #12203
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An unusual traffic light setup at the end of unsigned rijksweg 783 (A73 branch) in Nijmegen.


DSC_0001.jpg by jeroenvanlieshout, on Flickr


DSC_0004.jpg by jeroenvanlieshout, on Flickr


DSC_0014.jpg by jeroenvanlieshout, on Flickr
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Old March 8th, 2015, 12:04 AM   #12204
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Quote:
Originally Posted by ChrisZwolle View Post
Ice roads in the Netherlands? Yes, in 1963 the IJsselmeer (Lake IJssel) froze over, allowing a quick route across the lake. They even installed signs.



We have video!

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Old March 8th, 2015, 12:17 AM   #12205
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Quote:
Originally Posted by ChrisZwolle View Post
Large turbo roundabouts in Westland municipality.



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Turborotonde or turboplein :P ?

http://www.wegenwiki.nl/Turboplein
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Old March 8th, 2015, 12:18 AM   #12206
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Looking at the general area, its turbopolder
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Old March 8th, 2015, 11:04 AM   #12207
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Quote:
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Large turbo roundabouts in Westland municipality.

is that underpass for Bicycles?
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Old March 8th, 2015, 12:25 PM   #12208
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the Dutch sure love cyclists but not THAT much (I hope). It looks too big / wide for just bicycles.
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Old March 8th, 2015, 12:32 PM   #12209
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Turborotonde or turboplein :P ?

http://www.wegenwiki.nl/Turboplein
Technically they are a 'turboplein'. But there isn't really an English name for it. Sure, you can translate it into 'turbo square' or 'turbo circle', but would people understand what it is? A 'turbo roundabout' is probably dazzling enough
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Old March 8th, 2015, 12:43 PM   #12210
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What about channelized-flow roundabout?

Not, seriously, if a roundabout has flow separation and up to 5 lanes, it is past time to build a partially-grade-separated intersection. However, the Dutch seem to be very, very conservative in terms of building grade-separate junctions in built-up areas involving just regular roads, to the point relatively minor projects like that viaduct in Utrecht are major news.
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Old March 8th, 2015, 02:15 PM   #12211
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is that underpass for Bicycles?
I think the smaller tube (left side) is for bikes. The right side will be local-farm-traffic.
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Old March 8th, 2015, 10:51 PM   #12212
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I still don't really understand what the advantage is over a regular intersection with traffic lights ?

Takes much less space, and doesn't ruin your travel speed ( and thus fuel economy and valuable time) as much as a massive turbo roundabout like this.
Also there is no conflict with the opposite ends runing left, it allows a more flexible or ''traffic dependant'' traffic light setting that is more efficient.

If you have traffic lights, it defeats the point of a roundabout in the first place .


I also don't understand what the problem is with grade separation, it'll take much less space and with the ground prices in South-Holland I doubt it'd be much more expensive, while providing a far superior capacity and speed.

If that's to expensive, a simply high capacity traffic light setup with free right turns would be much better. Both in terms of time loss and space use.
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Old March 8th, 2015, 11:02 PM   #12213
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Simple


* there is no prevailing traffic flow, so traffic is busy from all directions, this means a simple grade separation won't work.
* free right turns work fine with car traffic, this is a high-truck-area (both going to the ferry and the agricultural sector). Resulting in a lot of back up.
* a simple traffic light setup won't work, this area is way to busy for a simple set-up with traffic lights. This roundabout setup is very very high capacity compared to normal roundabouts and junctions.


Chris knows the exact reasons but this is about as ideal as it gets for this region, unless you want a fully separated stack.
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Old March 8th, 2015, 11:11 PM   #12214
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Quote:
Originally Posted by da_scotty View Post
* free right turns work fine with car traffic, this is a high-truck-area (both going to the ferry and the agricultural sector). Resulting in a lot of back up.
Longer merge lanes, it's not hard, if trucks can accelerate long enough before merging there will be no problem.

Hell, this behemoth takes so much space, you can use very wide right turn curves, so they don't take so much speed out in the first place.
Quote:
* a simple traffic light setup won't work, this area is way to busy for a simple set-up with traffic lights. This roundabout setup is very very high capacity compared to normal roundabouts and junctions.
How is such a massive roundabout in any way more efficient than a wide ''normal'' intersection ( say 3 lanes for each direction, so 9 in total for each branch) ?

This roundabout creates extra conflict, you can't simultaneously let one branch turn left, and the opposite too at the same time.

Quote:
Chris knows the exact reasons but this is about as ideal as it gets for this region, unless you want a fully separated stack.
A setup like this:
http://goo.gl/maps/dskE0 ( but then 3 lanes for ''going straight'' instead of two, like on the turbo roudnabout)
Should be at least as efficient. It removes the conflict for left turns with left turn of the opposite direction, and thus allows more flexible light timings.
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Old March 8th, 2015, 11:18 PM   #12215
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Yeah i don't think right-turn wyes are an issue for trucks
but generally they don't help much unless there is a lot of right turns (normally, people drive straight on the main road)

Anyway you need turboplein because it is super Dutch
And traffic lights generally suck
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Old March 11th, 2015, 12:42 PM   #12216
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Buitenring Parkstad Limburg

The Council of State has dismissed the appeals against the construction of the 'Buitenring Parkstad Limburg', or 'Park City Limburg Outer Ring Road'. The project is a 24 kilometer four-lane controlled-access highway that will improve traffic in this quarter million people metropolitan area.

The road structure in this area has a very poor hierarchy, with very diffuse traffic flows due to the multiple cities. The current road network consists mainly of streets instead of major roads and provincial highways. Only the provincial road N299 is of higher standard, and the outer ring road will incorporate a significant stretch of the existing N299.

It is one of the largest provincial road projects in the Netherlands. It is already partially under construction. The project cost is € 441 million.



This is the northern part near Amstenrade, which was already approved earlier.
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Old March 11th, 2015, 04:39 PM   #12217
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Buitenring Parkstad Limburg

Some maps of the outer ring road project of Park City Limburg.

1. The Nuth interchange with A76.


2. Around Brunssum.


3. Between Brunssum and Landgraaf.


4. Around Landgraaf to N281
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Old March 11th, 2015, 05:20 PM   #12218
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Is the road fully grade separated and completely 2x2?
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Old March 11th, 2015, 05:23 PM   #12219
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Yes, it is fully grade-separated except for the interchanges at either end of the road. Full-standard interchanges with A76 and N281 would've been very expensive due to their complexity and probably would have a poor cost-benefit ratio.

The projected traffic volumes are between 21,000 and 35,000 vehicles per day in 2025. They recommend four lanes if traffic volumes exceed 23,000 vehicles per day, and only one link of the route would be slightly below that. They wanted a full four-lane expressway for consistency's sake.
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Old March 12th, 2015, 05:11 PM   #12220
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A10, Amsterdam

The design EIS for the 'Zuidasdok' megaproject has been released today.

The plan is to construct a local-express system along A10 between De Nieuwe Meer Interchange (A4) and Amstel Interchange (A2), and to put the motorway underground at the Zuidas office park. This will allow the Amsterdam-Zuid railway station to expand capacity (above ground).

The A10 will feature 12 lanes instead of the current 6 + shoulder lanes. There will be two separate tunnels of 1000 and 1100 meters in length.

Two bridges will be replaced by wider structures. These bridges each contain several parallel spans.

* Schinkel Bridge goes from 10 to 14 lanes
* Rozenoord Bridge goes from 10 to 17 lanes

The Amstel Motorway Interchange and De Nieuwe Meer Motorway interchanges will be modified to allow access to both the express lanes and local lanes from all directions.

The projected traffic volume is close to 300,000 vehicles per day in 2030. The project will start in 2017. The budget is € 1.4 billion or € 280 million per kilometer.

Current motorway + railroad corridor:
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