On Thu, 23 Apr 2009 22:25:36 +0300, SteveC <[email protected]> wrote:
> > On 23 Apr 2009, at 12:17, Teemu Koskinen wrote: > >> On Thu, 23 Apr 2009 21:34:05 +0300, SteveC <[email protected]> wrote: >> >>> I don't see a clear explanation as to why there is ambiguity if you >>> don't do turn restrictions at the end of ways on the wiki. There is >>> some stuff in the talk page >>> >>> http://wiki.openstreetmap.org/wiki/Talk:Relation:restriction >>> >>> Anyone care to provide an explanation? >>> >>> The reason I ask is that I've come across some roads where there is a >>> restriction every other turn in both directions... and splitting a >>> mile long road in to 30 pieces seems nuts. As a follow up, I can >>> guess, but what will the renderer do in that situation? I'm guessing >>> mapnik will give up trying to put 30 names on a one mile road and >>> won't notice they're the same name? >> >> >> If both from and to ways continue after the via point and neither is >> one-way, there's two possible ways to interpret it: the restriction >> could apply when coming from either of the ends of the from-way. This >> of course doesn't matter if there is similar restriction coming from >> both directions, but that's not nearly always the case. And even if >> there is symmetry in the real life restrictions, it's not appropriate >> in my opinion to map those with just one restriction. > > eh? don't you assign direction by saying 'from' and 'to' ? > Yes in the sense of which of the two ways you are coming from, but if the way is not one-way and it doesn't end at the via-node, there's two possible directions from where you can come to the via-node using the way. Regards Teemu Koskinen _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
