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Old July 24th, 2007, 11:15 PM   #1
fetg_
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2+1 roads

Upgrading a 1+1 road into a 2+1 road is a cheaper way to improve road safety than upgrading it to a 2+2 road.

Question is, when should 2+1 roads be considered instead of 2+2? What traffic volume should it have? How much capacity does it generally increase/decrease?

2+1 road:
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Old July 24th, 2007, 11:20 PM   #2
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2+1 is widely constructed through Europe.

It's not such a capacity question, as a safety issue. When there are 2+1 and 1+2 lanes, people tend not to overtake anymore on dangerous sections, causing serious frontal accidents, mostly deadly accidents.

My country just has build it's first 2+1 section, and it's right near my hometown (N50 Kampen - Zwolle (Interchange Hattemerbroek A28/A50/N50).
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Old July 24th, 2007, 11:53 PM   #3
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i consider 2+1 roads extremely dangerous. at least, in my country they have shown in that way. why? because drivers which have 2 lanes in one way feel like they can freely drive at left lane. and then when somebody from opposite direction is overtaking, it is very dangerous. or they both can overtake. it is very dangerous to have one lane for both directions.

we had one quite long section of 2+1 road in Croatia at motorway Zagreb - Rijeka, but it is upgraded into full motorway now. so we have few shorter 2+1 sections, mostly at up- and downhills, for instance at D1, D5, B8, so traffic volume is not factor for 2+1 road
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Old July 25th, 2007, 12:02 AM   #4
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Quote:
Originally Posted by x-type View Post
..or they both can overtake. it is very dangerous to have one lane for both directions.
Those roads are indeed extremely dangerous, they don't call the middle lanes 'suicide lanes' for nothing, but those kind of roads are called 1x3 though, instead of 2x1.

1x3 in england:


2+1 roads are quite safe as long as there is a centerdivider between the 2 directions like the N50 has in the Netherlands:

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Old July 25th, 2007, 12:04 AM   #5
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This is how our N50 look. You can't overtake unless you've got 2 lanes.



Some older 2+1 are more like suicide lanes, if there are just 3 lanes and no barrier or any sort of dividing between the directions.
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Old July 25th, 2007, 12:28 AM   #6
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Some nice 2+1 road in Southern Poland;
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Old July 25th, 2007, 12:50 AM   #7
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I don´t like 2+1 roads, the savety reasons are called above.
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Old July 25th, 2007, 12:52 AM   #8
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I dont think such things as a 3 lane road would be unsafe in a perfect world,where morons wouldnt overtake in curves..but in our world...
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Old July 25th, 2007, 12:54 AM   #9
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Quote:
Originally Posted by radi6404 View Post
I don´t like 2+1 roads, the savety reasons are called above.
They are safer as normal roads, because you can overtake trucks and grannies safe.
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Old July 25th, 2007, 03:13 AM   #10
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1x5(!) in Berlin, if the overtaking vehicle in front of you isn't fast enough you can take the middle lane. The porsche 911 behind you chased by the faster bugatti evyron can take the 4th and 5th lane. Judged by the marking it's all fully legal
http://maps.google.nl/?ie=UTF8&ll=52...&t=k&z=18&om=0
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Old July 25th, 2007, 08:43 AM   #11
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there are some 2+1 roads in Germany. Especially on hillsides, you get two lanes for the upward direction to overtake trucks and so on. The ones I drive pretty regularly are:

B50 near Flughafen Hahn
http://maps.google.de/maps?f=q&hl=de...&t=k&z=18&om=0

B414 near Hachenburg
(too much trees on the areal pic )

L 288 near Hachenburg
http://maps.google.de/maps?f=q&hl=de...&t=k&z=18&om=0

L258 near Neuwied
http://maps.google.de/maps?f=q&hl=de...&t=k&z=17&om=0



and now, I think I say it for 1734th time: I shall reactivate my digital camera....
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Old July 25th, 2007, 08:51 AM   #12
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Police in Russia tries last year to make such (1x3 like in England) road.
But all the drivers in Russia are crazy and don`t respect each other, and SIMPLE don`t know traffic regulations, so the road was full with breakdowns

After couple of months the road was closed...
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Old July 25th, 2007, 09:00 AM   #13
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In Latvia we have a new road style the wide road (1+1)



Overall width - 14,0 m
Asphalt width - 11,0 m
Road has one lane in each directions with a lane width of 3, 75 m.
Road has a 3,1m wide shoulder:
1,6 m - asphalt,
1,5 m - gravel.
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Old July 25th, 2007, 12:38 PM   #14
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Like the Mehrzweckstreifen in Germany.
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Old July 25th, 2007, 01:29 PM   #15
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^I really prefer 2+1 lane road to that wide 1+1 road, because a 2+1 lane road with middle barrier is much safer.
Video of 1+1 road: http://hullumaja.com/?pg=main&i=11244

Last edited by Rebasepoiss; July 25th, 2007 at 01:44 PM.
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Old July 25th, 2007, 09:08 PM   #16
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Quote:
Originally Posted by Chris1491 View Post
Like the Mehrzweckstreifen in Germany.
Don't know about that, but the shoulders can be used as a normal lane when the traffic is dense, or a lane for extra slow cars (with some defects or scared drivers )
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Old July 25th, 2007, 10:33 PM   #17
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i know that there are those "wide" 2 way roads with shoulders present in Poland. for us, who don't have that, it looks extremely scary and i would never try to overtake a truck which is half on shoulder.
bad things happen when Poles come to Croatia and try to drive in that way. i don't have to explain what happens
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Old July 25th, 2007, 10:41 PM   #18
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Yeah me neither. I think these lanes gives an extremely fake safety feeling, but they are more unsafe instead. If you build such important roads, tractors and slow vehicles don't belong on such roads at all.
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Old July 25th, 2007, 10:47 PM   #19
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you have something similar in Netherlands, but with only one lane. looks like normal lane with 2 large shoulders, there was a story before few weeks about it at ssc, even photos
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Old July 25th, 2007, 11:25 PM   #20
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You mean stuff like this?;



That's (stupid) markings in 60 zones. Only made to make the road looks narrow, since most people find it stupid to drive 60 on empty straight road (damn right they are).
You have to cross the marking to pass though. It's too narrow for two vehicles to pass within the markings.

Do you have a link or subforum where this was in?
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