[Tagging] exit_to on motorway_junction

[Johan C]

Well Paul, the fundamental question is: where do you store the information
needed for any router, in a node, in a way or in both? In my opinion
destination on a way can work very well, please take a look at this example:

http://wiki.openstreetmap.org/wiki/User:It's_so_funny

Cheers, Johan

ps no destination relation needed in this example, which makes it more
compliant to KISS

2012/11/20 Paul Williams <pjwderby at googlemail.com>

> I don't see any reason to deprecate exit_to, it seems to be the simplest
> method of mapping a destination sign on a motorway junction or similar
> exit. I use exit_to fairly frequently and it has been a documented tag for
> a while (although on the motorway junction page rather than it's own page)
> and is also used in JOSM presets.
>
> I feel it is a less ambiguous tag than destination (as a tag on a way) as
> it shows the specific point where a destination is signed, unlike
> destination tagged on a way. If you use destination as a tag on a way then
> I think you'd need to be sure that at every point along that way the
> destination(s) given is the same throughout and if not or you didn't know
> you'd need to split the way. The Taginfo stats also seem to show that
> exit_to is the most popular of the three different ways of mapping
> destinations: a destination relation, exit_to on a junction node, or
> destination as a tag on a way.
>
> A destination relation is also a clear way of mapping a destination as the
> intersection and both the 'from' and 'to' ways are part of the relation,
> and is particularly useful in mapping situations where exit_to wouldn't
> work (like at a crossroads) so I do also use this method. It is however
> more complex (and so is unlikely to be a method that a new mapper would be
> able to use) particularly where there are multiple destinations given on a
> sign which requires a relation for each destination.
>
> Cheers,
> Paul Williams
> (Paul The Archivist)
>
>
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