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Old July 21st, 2010, 03:26 PM   #141
nerdly_dood
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Nearly always in the US, 2+1 roads are short stretches in urban areas with lots of intersections, or if it's in a rural area, it's on a long uphill with two lanes going up - one for trucks ("climbing lane") and the other for cars that don't have to struggle, and one lane going down. There is no strict restriction on which lane can have which kind of traffic, but slower traffic has to keep in the right lane going up. (They also sometimes add an extra lane on the right side of Interstate highways as well, making them 2+3)
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Old July 23rd, 2010, 10:18 PM   #142
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I think the Sweden is the most know country for it's 2+1 roads so far, do you agree?
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Old July 23rd, 2010, 10:30 PM   #143
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I think 2+1 is most widespread in Sweden yes, although there are other countries who use it extensively as well, for example Germany.
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Old July 24th, 2010, 01:23 AM   #144
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Norwegian 2+1, E18 with concrete divider

http://maps.google.se/maps?f=q&sourc...,0.891953&z=11
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Old July 24th, 2010, 03:35 PM   #145
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There's a small part of the E6 too which is divided, but with a relatively wide, grassy median:

http://maps.google.com/?ie=UTF8&hq=&hnear=Nice,+Alpes-Maritimes,+Provence-Alpes-C%C3%B4te+d'Azur,+France&ll=60.841774,11.054049&spn=0.027391,0.090895&z=14&layer=c&cbll=60.841766,11.054497&panoid=GXnsmyjUcCX2MCOMkeIWcQ&cbp=12,291.25,,1,3.3

If you ignore the southbound part it almost looks like a US interstate, with the yellow divider line (which is not used on motorways in NO), except for the lack of wide shoulders.
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Old July 24th, 2010, 03:44 PM   #146
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In Italy there's a section of SS16 (Statale Adriatica) just north of Ancona which is 2+1 because of a relatively steep ascent:

http://maps.google.it/maps?f=q&sourc...80.21,,0,-7.81

it is just 1.4 km long. In the image, the road comes back to be 1+1 just after that overpass, you can also see the sign on the right.
This road is often full of Greek trucks heading to the Ancona harbour...
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Old July 25th, 2010, 02:57 AM   #147
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Agadir-Marrakech national road 8, in 2009, in Hight Atlas mountains

Since june 2010, there is an highway


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Old July 29th, 2010, 03:11 PM   #148
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E18 Trafikplats Västjädra (127) – Trafikplats Strö (123)

This is a set following the E18 westbound from Trafikplats Västjädra and a good example of a Swedish 2+1 road. This section of the E18 is a 25 km gap in the motorway.



AADT for this section is between 10500 and 14000. Speed limit 100 km/h.
This is the main road between the Stockholm and Oslo.




At this point, we're 419 km from Oslo and 120 km from Stockholm.


100 km/h is the standard speed limit for 2+1 roads in Sweden, altough there are sections with 110 km/h and 90km/h.


Rastplats Svedvi, no services.










This is what I call planning ahead. Notice how that bridge was built to accomodate a motorway. When and if this road is converted to a motorway that bridge from the 60's can be used for the new road.








Upcoming rest-areas


A potentially deadly head-on collision was avoided here. These steel cable barriers have been heavily criticised for being dangerous for motorcyclists.






Another head-on collision avoided.
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Old July 29th, 2010, 05:07 PM   #149
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Nice photos and comments.

Quote:
Originally Posted by kanterberg View Post

This is what I call planning ahead. Notice how that bridge was built to accomodate a motorway. When and if this road is converted to a motorway that bridge from the 60's can be used for the new road.
You mean the unused side of the bridge on the left?

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Originally Posted by kanterberg View Post


A potentially deadly head-on collision was avoided here. These steel cable barriers have been heavily criticised for being dangerous for motorcyclists.


Another head-on collision avoided.
This is why I think 2+1 roads WITH fence are the best solution for routes with not high enough AADT to be a motorway but to be safer than simple relative fast road.
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Old July 29th, 2010, 05:38 PM   #150
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Quick note about speedlimits on 2+1 in Sweden. 110 is always used in Västerbotten and Norrbotten, grade-separated or not. btw, nice pics kanterberg, good example of Swedish 2+1
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Old July 29th, 2010, 06:58 PM   #151
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Actually very nice report.
I've got a question about interchanges. I see two right turns - to Svedvi and another one to Hallstahammar. Can you explain, which direction has got 2 driving lanes in each situation (it's hard to understand from pictures). Why? I don't understand, whether is there additional lane used for turning or not.
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Old July 29th, 2010, 09:38 PM   #152
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Quote:
Originally Posted by Jevpls View Post
Actually very nice report.
I've got a question about interchanges. I see two right turns - to Svedvi and another one to Hallstahammar. Can you explain, which direction has got 2 driving lanes in each situation (it's hard to understand from pictures). Why? I don't understand, whether is there additional lane used for turning or not.
Glad you liked the pictures. There is not a general rule, but a common practise is to let the entrance ramp become the right lane and the start of a 2-lane stretch. Exits usually come at the end of a 1-lane stretch. As a result, it is often 1+1 through the interchange/junction.
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Old July 30th, 2010, 09:58 AM   #153
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Quote:
Originally Posted by kanterberg View Post
As a result, it is often 1+1 through the interchange/junction.
So, it really happens. Once I had a talk with road planners and they also said that the only suitable way is to use 1+1 in interchange stretches.
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Old August 1st, 2010, 01:37 AM   #154
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There are some short sections of these for hills on routes I sometimes drive in England - e.g. this one has double solid white line as divider and works fine as far as I've seen
http://maps.google.co.uk/maps?hl=en&...122.5,,0,15.64

This one has a wider divide which becomes a proper barrier - the problem here is that it's so short and there's sometimes about 10+ cars backed up behind a slow lorry who all want to get past, so the return to 1+1 can feel a bit dodgy, especially for those of us with a low power engine
http://maps.google.co.uk/maps?hl=en&...17.37,,0,16.62

We also have some 1+1 roads probably best described as 1.5+1.5 as per earlier post (or maybe 1.75+1.75) - OK if people are sensible but I think this example underlines how dangerous it can be, as the googlecar is being overtaken by the vw (and previously the open-top volvo) in the face of lots of oncoming traffic
http://maps.google.co.uk/maps?hl=en&...25.84,,0,24.56
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Old August 1st, 2010, 08:42 PM   #155
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Quote:
Originally Posted by tbh444 View Post
There are some short sections of these for hills on routes I sometimes drive in England - e.g. this one has double solid white line as divider and works fine as far as I've seen
http://maps.google.co.uk/maps?hl=en&...122.5,,0,15.64
2+1 up a hill is a great way to increase capacity and safety, but when it comes to road safety there really is no point making it a longer 2+1 unless you have some sort of proper barrier (e.g. concrete, steel cable). A 2+1 road with a proper barrier will have a near-motorway safety standard because head-on-collisions are eliminated.

The problem is that a 2+1 will have capacity problems once you pass a certain AADT (I would guess already at 15 000). Then you’ll start seeing sudden traffic jams for no other reason than people merging into a one-lane stretch.
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Old August 2nd, 2010, 03:45 PM   #156
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Quote:
Originally Posted by kanterberg View Post
2+1 up a hill is a great way to increase capacity and safety, but when it comes to road safety there really is no point making it a longer 2+1 unless you have some sort of proper barrier (e.g. concrete, steel cable). A 2+1 road with a proper barrier will have a near-motorway safety standard because head-on-collisions are eliminated.

The problem is that a 2+1 will have capacity problems once you pass a certain AADT (I would guess already at 15 000). Then you’ll start seeing sudden traffic jams for no other reason than people merging into a one-lane stretch.
The vast majority of American 2+1 roads are on hills to allow slower trucks to go up without obstructing traffic that can keep up with the speed limit. After the top of the hill, they normally go back to a 1x2.
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Old August 2nd, 2010, 04:20 PM   #157
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Those are not considered 2+1 roads, but more like crawling lanes for slow traffic.
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Old August 2nd, 2010, 06:08 PM   #158
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Quote:
Originally Posted by ChrisZwolle View Post
Those are not considered 2+1 roads, but more like crawling lanes for slow traffic.
I agree.

Something like this. About 1 km long lane for heavy traffic.

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Old August 2nd, 2010, 06:08 PM   #159
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yeah they call it a climbing lane
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Old August 3rd, 2010, 12:42 AM   #160
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Quote:
Originally Posted by CborG View Post
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
Digging this up.. This is the first time I see a 1x5 in Europe.
I remember driving on many of them in North America, namely Ontario :
http://maps.google.com/maps?source=e...-nE9vdZ99karOA

What is the AADT of such a 1x5 (or 2+1+2) road ? How safe are they compared to 2+1 ?
Also, if 2+1 (and 'super 2+1' with central barriers, safety and merging lanes) are not alternatives to small motorways, could 1x5/2+1+2 be a solution in Europe ?
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