Highway=path wiki page additions and updates

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@Matija_Nalis

Be aware that “add nothing” is work-multiplicator

I would argue that bicycle=unknown would attract even more attention and that we should not add data that is not verifiable by others either.

@bradrh

That’s not a good global suggestion.

I agree, but it was not a global suggestion, it was the answer to post #41.

@bradrh

I don’t see the use case for permissive.

Permissive only ever makes sense if the permission can be revoked at any time.