[Tagging] Permissive turn restrictions

[Nick Hocking]

Hi,


Apparently, in Australia the default rule at traffic lights is that u-turns
are not permitted.

At some ,there are signs saying " U Turn permitted".  How do we tag this.


Turn restriction seem to be either mandatory (only) or prohibitive (no)
but I think we need a permissive one, maybe (allowed)

Nick
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