[Talk-ca] Ref tags in Ontario

[Stewart C. Russell]

Hi Kevin

> Andrewpmk (almost entirely him) and I reversed all of the ON prefixes
> to the 400-Series highways

Many thanks to you both for doing that.

> Personally I don't think there should be any prefix for rendering or
> navigation purposes, but I guess it depends on whether you think
> county or regional road prefixes should be there for navigation or
> rendering purposes.

Prefixes are definitely 'tagging for the map', so shouldn't happen,
IMBO. Ontario's got a fairly robust boundary, so the relations should
sort out what road is in what province.

cheers
 Stewart