My point is rather, if highway=residential and highway=unclassified must be wider than a certain threshold, we need a replacement highway-class for ways with the same function but having a width below the threshold. AND all renderer need to support all those new types ( just hinting to the success-story of highway=busway 
).
Isn’t it easier to convince the renderer to simply evaluate width? Since with all our existing tags we can describe all those situations.
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