[Tagging] Lane dividers

Tobias Knerr osm at tobias-knerr.de
Thu Oct 18 21:34:46 GMT 2012

On 18.10.2012 21:56, Alberto wrote:
> I think that tagging the effect is more important than the actual behavior
> of the sign.
> If you are in an unknown country, what would you like from your GPS, that it
> gives you correct navigation instructions or correct rendering?

Both. ;)

In either case, a country-dependent translation needs to happen, but
translating from appearance to legal effect should be a bit more
straightforward than the other way around. After all, that's what human
drivers do - so it *has* to be possible to do the translation in this
direction. In the other, not so much, there can easily be ambiguity.

I would also like to point out that tagging the effects may require
multiple tags rather than just one, and that mappers don't necessarily
even know all the effects. Identifying how the divider looks doesn't
require that knowledge.

> The rendering can be adjusted country by country, if needed.

This wouldn't help. Martin's original idea ("crossable") simply does not
contain enough information to reverse-engineer the appearance from the


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