For practical tagging I think it is too theoretical for most mappers to
understand the difference.
[...]
In somehow, having a not to complicated model or at least a two levels
model a first simple model could be better.
Back to my initial problem
lanes=2
lanes:condtional = 3 @ traffic_jam
lanes:psv:conditional = 1 @ traffic_jam
Basic data users just need to understand the first key. More advanced
one may use the two last.
lanes=* wiki would need to be modified to not count temporary lanes. It
would be more consistent as most of the time only two lanes are available.
Eric
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