On Thu, 8 Aug 2019 at 03:18, Michael Tsang <mikl...@gmail.com> wrote:
If the "primary purpose" of the road is through traffic, and the "driving > experience" is like on a major road (e.g. straight, fast, no obstruction, > no > give way, etc.), that part of the road is still red / pink. > > However, if that road is built like the other residential cul-de-sac with > a > lot of slowing and calming features like give ways, curves, or very narrow > such that it become a choke point causing serious traffic congestion every > day, > I will think it as residential. > I think we're pretty much in agreement on this. Of course, I live in the UK so through routes are officially designated and guesswork doesn't need to be applied. So for me, it's simple: if it is an officially-designated through route then that's how it gets tagged, whether there are houses along it or not. For others it may be harder if there are no official designations for through routes, then they have to use their judgement to see if it quacks like a through route. In either case, if it's not a through route and has houses along it then it's residential (or, in some cases where the houses are far apart, a service road or even a track). There might be a case for some form of tagging that says "this is primary/seconday/ tertiary/quaternary route with houses along it" but I think an area tagged with place=* makes that clear for human data consumers. I suppose there are edge cases where a router could be faced with two alternative routes at the same level and with the same speed limits and the same distance between two given points but they have no way of knowing that one has houses along it but the other does not, but it's unlikely. Same distance is unlikely. Same distance with same speed limits is even more unlikely, especially if one has houses and the other does not. What I don't see as sensible is tagging through routes as residential because there are some houses. -- Paul
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