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' ? > > About the splitting, it's already necessary to split the way if some > other property changes, eg. speed limit or number of lanes (which > does change more often in some places than there are restrictions), > it's either the renderer's job to figure out that the pieces belong > together or we could use some relation to group the pieces together > but that too would require support from the renderers. Yes - but turn restriction splitting will lead to much, much more splits > > >> Best >> >> Steve > > > Regards Teemu Koskinen > Best Steve _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
