On Thu, Apr 23, 2009 at 14:45, David Lynch <[email protected]> wrote:
> On Thu, Apr 23, 2009 at 14:25, SteveC <[email protected]> wrote: > >> 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' ? > > > > To use a bit of ASCII art: (best viewed in monospace font) > > (1) > | > B > | > (2)--A--(3)--A--(4) > | > B > | > (5) > > A turn restriction from way A onto way B via node 3 of "no left turn" > doesn't specify whether the left turn is from Node 2 towards Node 1, from > Node 4 towards Node 5, or both. > > IMO, adding a "from_node" role for the last node before the intersection > and a "to_node" for the first node after the intersection would be the way > to get rid of the ambiguity without requiring a lot of splitting. > > -- > David J. Lynch > [email protected] > > -- David J. Lynch [email protected]
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