[Tagging] More no_u_turn

[Nick Hocking]

A car travelling westbound on an undivided road is about to cross a
north/south divided road at traffic lights.

We wish to prevent the car from doing a U-turn at this intersection.
Do we have to put in  two no_u_turn restrictions, one for each of the
north/south carriageways.

If we only need one, where do we tag this - on the left carriageway or
the right one?
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