.
Routing-wise, that tag seems perfectly useless, because the much less
ambiguous, better way to indicate no passing from one way to another
is simply not to connect them, or, in case of vehicle distinction, to
connect them with a tiny bit of segment on which the access
restriction applies the normal way.
Ok, but software-wise that means you need to look up stuff in the area,
which accounts for extra operations. This tag just says: No need to
look further, stop here. Don't even look voor 'close-by roads'. Not as
useless when you look from other perspectives.
It looks from discussions that this tag is really confusing people
regarding the restriction meaning. I have read that such a vague
definition "is used for routing". Now you figure. !!!
It is confusing because the icon in JOSM is the same as F45 sign. But
they have nothing to do with eachother. Just like the traffic-sign icon
in JOSM that shows all lights burning when you look closely, in reality
they take turns in burning.
We need to take a shovel and seperate the siamese twins once and for all.
I doubt very much that this tags helps anybody or any quality-check
program to understand anything. A note should suffice, and I think the
best option would be to remove that confusing tag.
As above, it helps to decide and for performance it will sure help in
preventing expensive lookups just to know nothing of interest is there.
Glenn
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