Hi,

> If my interpretation is correct, it says that all those types of
> highway are considered as unpaved, unless there is a surface,
> tracktype, smoothness AND sac_scale parameter!

Rule is OK. If you negate conjunction (by use of "unless"), then you should use disjunction of negations:

highway is unpaved when there is *no* surface and *no* tracktype and ...

equivalent:

highway is unpaved unless there is surface or tracktype or ...

--
Best regards,
Andrzej

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