[OSM-newbies] Splitting streets into one ways--too much?

john at jfeldredge.com john at jfeldredge.com
Wed Dec 8 23:05:32 GMT 2010

According to what Kenneth wrote, there IS a physical barrier between the two sides, the median he mentioned.

-------Original Email-------
Subject :Re: [OSM-newbies] Splitting streets into one ways--too much?
From  :mailto:stevagewp at gmail.com
Date  :Wed Dec 08 16:09:51 America/Chicago 2010

  IMHO, if there is no physical barrier, it's a bad idea to map the
two lanes individually. Some reasons:
1) It renders badly. In every renderer. Spurious one-way arrows, the
road comes out looking wider, you get the extra lines down the middle,
ugly intersections...
2) Routers no longer know that you can u-turn anywhere.
3) You're losing the piece of information that the two lanes are
physically contiguous. There should be some kind of relation binding
them together, but none has been defined, afaik.
4) It's misleading to users - it looks like a divided road, when it's not.
5) Causes various inaccurate flow-on effects, like a turning circle
being represented as a single way, rather than an "area".

I'd suggest not going down this road until we have some guidelines in
place for how to do it properly, and avoid these issues.


On Thu, Dec 9, 2010 at 2:03 AM, Kenneth Pardue <kenneth at pardue.me> wrote:
> I'm working in my local area using the new Bing imagery.  It really allows me to see much greater detail and to add that to OSM.  There are a number of residential streets in my locale that are separated by a median.  Traditionally, I've converted such streets into two one way lanes.  Of course this is particularly useful in areas like interstates or large highways, but I'm wondering if I'm taking it too far by doing it to the residential streets in my area?  At what point is an effort for absolute accuracy go to far?
> See the area, and my edits, here: http://www.openstreetmap.org/?lat=31.27966&lon=-92.48732&zoom=17&layers=M
> newbies mailing list
> newbies at openstreetmap.org
> http://lists.openstreetmap.org/listinfo/newbies

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John F. Eldredge -- john at jfeldredge.com
"Reserve your right to think, for even to think wrongly
is better than not to think at all." -- Hypatia of Alexandria

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