[Tagging] Driving side

John Packer john.packer7 at gmail.com
Thu Mar 27 14:35:20 UTC 2014

While I suggested the value "opposite" with the same reasoning as Pieren
i.e. to guarantee this tag is used on ways only when necessary; the truth
is there wouldn't be any guarantee because the values "left" and "right"
still exist (though theorically only for countries).

The advantage of *not* having "opposite" as a value is not to need to
verify the country's driving_side to be able to tell which driving_side
that way has.

Since we need to use validator rules anyway, we could use:
1. driving_side is only allowed ways that belong to countries that have
driving_side specified;
2. driving_side (on ways) must have the opposite value of the driving_side
specified in that country.

2014-03-25 5:51 GMT-03:00 Pieren <pieren3 at gmail.com>:

> On Mon, Mar 24, 2014 at 4:37 PM, Tobias Knerr <osm at tobias-knerr.de> wrote:
> > Could you elaborate?
> The "left/right" is only on boundary relations.
> The "opposite" is only on ways.
> This will also avoid a proliferation of unnecessary
> "driving_side=left/right" on ways where it's only required for the
> non-default rule.
> Pieren
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