That brings up an issue. Where I live (Nashville, Tennessee, USA), it is common for major streets to have two or more lanes in each direction, plus a turn lane down the center that can be used by traffic going in either direction. Some, but not all, of these streets are mapped as a pair of single-direction ways. In such a case, should the shared turn lane be mapped as a third, non-directional way?
-------Original Email------- Subject :Re: [OSM-newbies] Splitting streets into one ways--too much? >From :mailto:[email protected] Date :Wed Dec 08 17:10:27 America/Chicago 2010 Yes, in this case there is a physical barrier. On a semi-related note, on another part of town there is a 4 lane highway. Parts of the highway are separated by a median, and other parts bring both eastbound and westbound lanes together, with a turning lane separating them. That seems even more valid than the residential roads to split into two separate ways, but there isn't technically a barrier separating the lanes. Make it two ways or merge into one where there is no physical barrier? I'm thinking the former. On Dec 8, 2010, at 5:05 PM, [email protected] wrote: > 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:[email protected] > Date :Wed Dec 08 16:09:51 America/Chicago 2010 > > > Hi, > 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. > > Steve > > On Thu, Dec 9, 2010 at 2:03 AM, Kenneth Pardue <[email protected]> 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 >> [email protected] >> http://lists.openstreetmap.org/listinfo/newbies >> > >_______________________________________________ > newbies mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/newbies > > -- > John F. Eldredge -- [email protected] > "Reserve your right to think, for even to think wrongly > is better than not to think at all." -- Hypatia of Alexandria >_______________________________________________ > newbies mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/newbies -- John F. Eldredge -- [email protected] "Reserve your right to think, for even to think wrongly is better than not to think at all." -- Hypatia of Alexandria _______________________________________________ newbies mailing list [email protected] http://lists.openstreetmap.org/listinfo/newbies
