[OSM-talk] Advanced relationships

[Nic Roets]

>With a good editor, why would relationships be hard?
>There's no compulsion on people to enter them, any more that there is
>compulsion on people to enter anything else at the moment.

Well you need to upgrade all the editors (and there are many),
otherwise you face a revolt from the users who are left out. And if
ignorant users come across something that they don't understand
they're likely to just delete it and redo it.

On 6/13/07, Abigail Brady <morwen at evilmagic.org> wrote:
> Not really true.  How can you model a simple no-right-turn (or
> no-left-turn), which has just been posted by a sign?  How do you tell

Well, if you break the road down into two oneway ways in the area
around the junction / intersection and then have a short oneway way
that connects one of them with the perpendicular street. Then it may
become necessary to break the perpendicular street also into two
oneways. Just because it crosses the street does not mean there needs
to be an intersecting node.

The journey planner may then frequently recommend a U-turn at the node
where you recombine the two oneways back into one bidirectional way.
To prevent that you'll need a lot of oneways... Then you need an
editor that makes it all managable at lowzoom...

> the journey planner that what appears to be a sharp right turn is
> actually a straight on, according to the road markings?  There's no
> recommended way of doing this.

I guess you can have a few nodes close together to smooth the turn.

I'm not too experienced with journey planners (I only know Mapsource
5.4 with South African City Select 4.00 and it makes a lot of
mistakes). But I'm tempted to upgrade gosmore so that it can produce
written instructions for the routes it creates.