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Look at this example there are two lanes in both directions and one middle lane in the middle which serves for cars turning left in both directions (the best is to look at the Aerial background to understand the situation). Currently each direction has its own way, which is good, but it makes it somehow difficult to map the middle lane.
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Try something like this ??? Do you suggest merging the directions in this example?
(22 May '13, 23:19)
gorn
I see that this is a proposal, which was not accepted (in this form), so maybe it is not so good solution ... I do not know.
(22 May '13, 23:21)
gorn
1
Wiki voting isn't always a good indicator of tag acceptance - it just means that the people who participated in the wiki vote (often very few) accept it. Taginfo is a better indicator: http://taginfo.openstreetmap.org/keys/lanes:forward#overview Although it looks like not too many people are mapping suicide turn lanes: http://taginfo.openstreetmap.org/keys/reversible%3Aboth_ways#overview
(23 May '13, 14:37)
SomeoneElse ♦
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For those outside of the US, here is a link describing how it is used and another with some images about the "center turn lane": https://www.dmv.ca.gov/pubs/hdbk/traffic_lanes.htm#cltl https://encrypted.google.com/search?q=center+turn+lane&client=ubuntu&hs=c5L&channel=fs&tbm=isch&tbo=u&source=univ&sa=X&ei=paueUbbuFaLCigL0q4HgCg&ved=0CDYQsAQ&biw=1751&bih=850 I think they parallel ways in the original poster's example should be replaced by a single way as there is no median, curb or barrier to keep the traffic separate. And that way should have a tag of "centre_turn_lane=yes". It looks like that is already used even if not widely, see http://taginfo.openstreetmap.us/keys/centre_turn_lane#overview I checked a few highways in my area to see how that was tagged and found that it is not tagged at all but in each case there was only one way as I would expect. |
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This tagging is recognized by the Lane and road attributes JOSM plugin: lanes:both_ways=1 turn:lanes:both_ways=left https://wiki.openstreetmap.org/wiki/Proposed_features/Suffix_both_ways |
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If they turn left at the same crossing, just add an extra way in between and switch the directions each time again. 2
If there are just painted lines and no physical barrier, then don't use multiple ways.
(22 May '13, 22:03)
cartinus
is this wrong then http://www.openstreetmap.org/?lat=52.12167&lon=-0.295907&zoom=18&layers=M
(23 May '13, 11:17)
andy mackey
they use multiple lanes for motorways and they are just lines.
(23 May '13, 11:28)
andy mackey
I think in this case the separation is justified - there is a separation in the middle. I have added the turnlanes into your example place and polished it little but, so have a look
(23 May '13, 12:00)
gorn
2
I think Andy was referring to the place in original question, where there is no barrier.
(23 May '13, 12:35)
gorn
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Looks dangerous as from aerial, as the arrows don't match the junctions. does it have a no overtaking rule or sign in force?
What exactly do you mean by "arrows don't match the junctions". There is a middle lane which can be entered from boths directions by vehicles turning left.
In the Uk the turning lane would usually serve one turn and the lane would finish at the turning. I can understand the suicide name. I have heard this term applied to a shared overtaking lane which we still have some of, and I guess some may have a service road off it. Careful drivers would enter these by finding an approach from the other direction by using a roundabout to turn back.
screenshot - in answer to your comment gorn these are the arrows that don't match the junctions.
Yes, exactly these arrows denote the middle "suicide" lane which is shared by both directions for cars which serves for cars turning left in both directions. That is the lane I am looking forward to map correctly. Hopefully it is clear now.
Screenshot shows a very typical, at least for the US, road with a continious left turn lane for turning into and out of the road. I am interested in this as there are a number of roads in my area that have this same characteristic.
I think in this case the use of multiple ways, which in my mind implies a center median that cannot be crossed, is the problem. I'd have one way there and specify the center lane use via a lane tag of some sort.
However I don't see in the Wiki nor in taginfo a well used tag for marking a continuous, both direction, turn lane.
@stf Thanks for perfectly pointing out the problem. The question is how to tak the both-directional middle turning lane.