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Old August 12th, 2011, 09:32 PM   #1481
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They should use the rubberized asphalt everywhere near the settelments since it reduces noise by 7dB
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Old August 12th, 2011, 09:52 PM   #1482
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They use various noise-reducing pavement types in the Netherlands. Regular porous asphalt is the most common, approximately 70 or 80% of the Dutch motorways have it. Apart from the superior drainage capabilities, it reduces noise by around 3 dB (similar to a 30 km/h change in traffic speed). It's about twice as expensive as regular asphalt and needs a major overhaul every 7 - 10 years depending on truck load. There is also double-layer porous asphalt, which is common on sections that needs to be widened, without increasing noise. It can reduce noise by about 6 dB, which is similar to 75% less traffic, or 60 km/h lower speed limits. Together with the road widening, increased traffic, etc. it generally reduces noise by about 2 dB. Still an improvement with wider roads and more traffic. However, it's about twice as costly as regular porous asphalt (4 times regular asphalt).

The only country in the world who can (apparently) afford this is the Netherlands. Other countries use it too, but only on minimal percentages of their network, or large sections of toll roads (like in France or Japan).
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Old August 12th, 2011, 10:31 PM   #1483
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Thanks for useful info. For Czech Rep it would be great if they use it at least for expressways running throught cities such as Prague magistrala.
Otherwise these asphalts are obviously costly, but it could reduce costs for antinoise barriers, which are costly too. I don't now what proportion of total costs form asphalt so I can't conclude generally on this.
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Old August 12th, 2011, 11:30 PM   #1484
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What's even better that noise barriers are not even always necessary if you apply double-layer porous asphalt. The 6 dB reduction can be enough to stay below the norms, which means the motorway doesn't transform into a noise barrier alley with no visible surroundings.

There are also other pavement types that can reduce noise even more, in the Netherlands they tested with a rubber-type asphalt that reduces noise by 9 dB. That's incredible. However, these are experimental, and their effects on safety, drainage and durability have not been tested thoroughly enough to apply it on motorways.
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Old August 13th, 2011, 01:01 AM   #1485
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Quote:
Originally Posted by ChrisZwolle View Post
They use various noise-reducing pavement types in the Netherlands.
I am just not sure about the climate condition in which these pavements can be used consistently. It is not only different characteristic of the asphalt and its reaction to the huge temperature changes, long term frosts, etc... It is also the maintenance care those asphalts require.

I would be interested if the winter snow shutdowns of the whole grid in NL are also not partly due to the characteristics of the porous asphalt and the special maintanance care it requires to keep its characteristics. Would this be thus appliable to much harsher climate conditions?

I personally think that porous asphalt, or special surface substances in general are great. I just dont know how the climate conditions change the whole picture.
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Old August 13th, 2011, 12:53 PM   #1486
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Isn't 50 km/h just too slow for a grade-separated road like Magistrala? Or does it just apply to at-grade sections which are right near the buildings? Google Street View shows the (old?) limit of 70 on some parts of it.
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Old August 13th, 2011, 01:04 PM   #1487
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Yep, I'm using it almost everyday and the ideal speed according to road design varies between 50 and 80 km/h. But due to noise issues it had to be limited down to 50 km/h. Esp. on its southern part (Jižní spojka to Na Pankráci street) the motorway-like design (3+3 lanes with hard shoulders and grade separation) and the 50 km/h limit don't fit together from the driver's point of view...
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Old August 13th, 2011, 01:56 PM   #1488
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Didn't they try some other measures (especially at the motorway-like stretch you mention)?....

Last edited by kubam4a1; August 13th, 2011 at 01:56 PM. Reason: deleted signature - no need here
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Old August 13th, 2011, 02:01 PM   #1489
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There is a project for anti-noise barriers, but it's pretty expensive and not fully effective because of adjacent high-rises. Anyway, people got used to it, esp. because of section-control on this stretch.
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Old August 13th, 2011, 02:12 PM   #1490
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It's probably one of the most interesting urban expressways of Praha though. We're talking about 5. května a.k.a. Chodovská radiála, right?
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Old August 13th, 2011, 02:25 PM   #1491
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Yep, this stretch. It was built as urban expressway, part of so called ZAKOS (Základní komunikační systém - Basic Trunk Road System of Prague). For the last one made in 1990 see this link. Few years ago "motorroad" signs were put down, so nowadays it's de iure an ordinary street, but technically it hasn't been changed at all.
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Old August 13th, 2011, 02:38 PM   #1492
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By the way, once I was told that this high-rise was built for strategic purposes - to be torn down to block the magistrala in case of land attack coming from D1 motorway. During communist period those flats ought to be assigned only to army members.
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Old August 13th, 2011, 02:46 PM   #1493
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Was it built before or after 1968?
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Old August 13th, 2011, 02:50 PM   #1494
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Quote:
Originally Posted by mapman:cz View Post
By the way, once I was told that this high-rise was built for strategic purposes - to be torn down to block the magistrala in case of land attack coming from D1 motorway. During communist period those flats ought to be assigned only to army members.
so crazy that it actually makes sense.. in a weird way..
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Old August 13th, 2011, 03:00 PM   #1495
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Quote:
Originally Posted by ChrisZwolle View Post
Was it built before or after 1968?
The construction started around this year. The magistrala there was opened in 1973, the high-rise was finished several months (or maybe few years) earlier. AFAIK both were constructed at the similar time period. See page 37-38.
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Old August 26th, 2011, 11:07 PM   #1496
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R1 Pražský okruh - Ring Prague

This is my first of many sets that document the Czech highways. It's the R1, also known as the Pražský okruh or Prague Ring Road. The ring road is currently incomplete, but the longest existing section is the southern part, which mostly opened in 2010, except for the western section, which is older. There is a lot of truck traffic on the motorway, I doubt if the 2x2 lanes will be sustainable in the future. Especially the western half is already nearing capacity at rush hour it seems. The eastern half is less busy because it ends too far south of the city. Most people take the Barrandov exit and use Jižní spojka to the other end of the city.


route:



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R1-1 by Chriszwolle, on Flickr

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R1-2 by Chriszwolle, on Flickr

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R1-3 by Chriszwolle, on Flickr

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R1-4 by Chriszwolle, on Flickr

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R1-5 by Chriszwolle, on Flickr

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R1-6 by Chriszwolle, on Flickr

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R1-7 by Chriszwolle, on Flickr

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R1-8 by Chriszwolle, on Flickr

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R1-9 by Chriszwolle, on Flickr

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R1-10 by Chriszwolle, on Flickr

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R1-11 by Chriszwolle, on Flickr

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R1-12 by Chriszwolle, on Flickr

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R1-13 by Chriszwolle, on Flickr

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R1-14 by Chriszwolle, on Flickr

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R1-15 by Chriszwolle, on Flickr

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R1-16 by Chriszwolle, on Flickr

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R1-17 by Chriszwolle, on Flickr

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R1-18 by Chriszwolle, on Flickr

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R1-19 by Chriszwolle, on Flickr

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R1-20 by Chriszwolle, on Flickr

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R1-21 by Chriszwolle, on Flickr

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R1-22 by Chriszwolle, on Flickr

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R1-23 by Chriszwolle, on Flickr

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R1-24 by Chriszwolle, on Flickr

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R1-25 by Chriszwolle, on Flickr

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R1-26 by Chriszwolle, on Flickr

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R1-27 by Chriszwolle, on Flickr

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R1-28 by Chriszwolle, on Flickr

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R1-29 by Chriszwolle, on Flickr

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R1-30 by Chriszwolle, on Flickr

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R1-31 by Chriszwolle, on Flickr

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R1-32 by Chriszwolle, on Flickr

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R1-33 by Chriszwolle, on Flickr

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R1-34 by Chriszwolle, on Flickr

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R1-35 by Chriszwolle, on Flickr

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R1-36 by Chriszwolle, on Flickr

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R1-37 by Chriszwolle, on Flickr

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R1-38 by Chriszwolle, on Flickr
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Old August 27th, 2011, 12:02 AM   #1497
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Nice, glad to see your photoreport.

Quote:
Originally Posted by ChrisZwolle View Post
There is a lot of truck traffic on the motorway, I doubt if the 2x2 lanes will be sustainable in the future. Especially the western half is already nearing capacity at rush hour it seems.
According to projections after completion of city ring plus radials and particulary the northern part of outer ring the capacity of southern part should be sufficient. Currently main problem are trucks which should be shifted to the north once it's completed (or will be shifted to the railroads if we're lucky).
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Old August 27th, 2011, 07:46 PM   #1498
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First video release: Jižní spojka, or southern connector, which is the inner city bypass of Prague.

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Old August 27th, 2011, 10:44 PM   #1499
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when we'll be able to click on a sign and another video of that direction will open up? great video!
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Old August 27th, 2011, 10:48 PM   #1500
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Nice video, free-flow traffic on Jižní spojka, that's just luck during workdays
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