[Talk-GB] Documentation of passing=* tag

[Satoshi IIDA]

Hello.

I would like to know more about the tag "passing=*".
It seems that the tags passing=difficult and passing=caution seem to be
commonly used in the UK, but I could find no documentation on the OSM wiki.

https://taginfo.openstreetmap.org/keys/passing#values

I would like to know what their meaning of them is.
Would you happen to know anything about it?

## Background
I am a mapper, editing in Japan.
In the OSM, it is recommended to use `lanes=1` for these 1.5-lane ways.
However, this does not express that it is possible to pass each other.

Therefore, we would like to know more about the tag `passing=*`.
If values such as `passing=yes/no/others` are available, we think that
roads with `lanes=1.5` in Japan could be replaced by tags such as the
following.

https://www.mapillary.com/app/?lat=35.455479836101&lng=137.4147767667&z=17&pKey=364117255720380&focus=photo
   lanes=1
   passing=yes
   (width=5.8)
   (width:lanes=3.1)
   (oneway=no)

https://www.mapillary.com/app/?lat=35.464347638202&lng=137.4251362123&z=17&pKey=393768719177067&focus=photo&x=0.4932036975244724&y=0.578707555164132&zoom=0
   lanes=1
   passing=yes
   passing:hgv=no
   (width=4.4)
   (width:lanes=3.6)
   (oneway=no)

It seems the tags `passing=difficult` and `passing=caution` are already in
use in the UK, but I could not find documentation about `passing=*` in the
OSM wiki, so I am not sure in what situations it means.

https://taginfo.openstreetmap.org/keys/passing#values

We would appreciate it if we could find out the situation of the tag being
applied.

Best regards

-- 
Satoshi IIDA
mail: nyampire at gmail.com
twitter: @nyampire
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