"To identify an area of land on which a highway together with any associated footways and verges are constructed up to a boundary or barrier separating this land from private property." - http://wiki.openstreetmap.org/wiki/Proposed_features/highway
It was proposed in 2009 and then proposal died without any obvious reason (link to previously started discussion: https://lists.openstreetmap.org/pipermail/tagging/2009-October/000003.html ).
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