Am 20.04.2012 um 16:58 schrieb Jason Cunningham <[email protected]>:
> On 20 April 2012 14:35, Philip Barnes <[email protected]> wrote: > Which prompts another question, do we have a tag for a 'passing place'? > There is a photo of one on this page > http://en.wikipedia.org/wiki/Single-track_road > > Tag info shows it does highway=passing_place does get used > http://taginfo.openstreetmap.org/search?q=highway%3Dpassing > And there is a page on the wiki for it. Thanks for that. I would add a recommendation not to count such places for the lanes-count, but instead use the passing-tag. I will add a link to its article. > > And here's another question. > A twoway single lane highway implies that if you meet a vehicle coming in the > other direction the road is blocked. Hence the the common of existence, at > least in the UK, of 'Passing Places' mentioned by Philip. > A twoway two lane highway implies that common road vehicles can drive down > the road each within their own lane? > But there is a third situation that in my area is arguably more common than > implied single lane status, and that is a road which is wide enough for cars > to pass each other at at crawl, but which would be blocked if a large vehicle > meets another vehicle. This I assume is impotant information, especially for > routing, because these are roads a car owner would wish to avoid if there is > an alternative 'true' 2 lane road, and which a lorry or van should avoid > unless they must use the road. > > A while back I went through a period of trying to add lanes, speed limits, > and lighting info. This was prompted by the excellent "tools" produced by ITO > map eg www.itoworld.com/map/179 > While trying to sort through the confusing speed limit laws in my country, I > stumbled across a document advising that roads where two cars could pass > slowly or with care, but wider vehciles could not, the road should be > considered to consist of 1.5 lanes. Didn't bother to save the document at > the time and search engines can't track it down. Does the idea of lanes=1.5 > seem acceptable for roads where cars can pass slowly, but wider vehicles will > block the road. There is an obvious problem that the decision to label a road > as lanes=1.5 is subjective. In my opinion, lanes=1.5 is a very bad choice. We have a tag for this situation: width . According to taginfo, lanes=1.5 is used, but not too often. What should we do? I would recommend not to use it and advise to specify a width (which is also objective rather than subjective as 1.5 is). Opinions?
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