[Openstreetmap] Re: key values to represent restricted turns

[Tom Carden]

On 1/25/06, Gabriel Ebner <ge at gabrielebner.at> wrote:
> On Mon, Jan 23, 2006 at 08:27:54PM +0000, Tom Carden wrote:
> > How about something like a property on a node like
> > no-turn=a.b,c.e,e.d; where a/b/c/d/e are segment ids for segments
> > connected to that node, and order matters?  All other combinations are
> > fair game for routing.
>
> Can we have that on segments too?
>
> E.g. there are some junctions (in Austria, at least) where you can drive from
> A to B but not from C to B:
>
>            |
>            C
>            |
>       --D--+--B--
>            |
>            A
>            |
>

No I don't think it would work like that. In that case you'd add
another node and tag both nodes accordingly.  If segments cross
without a common node, I would assume fot the purposes of routing that
it was a bridge/tunnel situation.

T.