While having category intersection is definitely a huge plus now, for it to work really well we need it to be traversing up and down. Does it do that right now?
Especially because Commons has a policy against over categorisation (which makes sense), and because we subcategorise so insanely much (might not so much sense always but oh well), you really need it to traverse categories recursively to get anything useful.
So that you can search for category "Flowers" or "Red" and still those from "Red flowers".
And similarly so with Bicycles categorised. You want to get those from "Bicycles facing left" or "Bicycles in Vietnam" to be included when looking for "Bicycles".
-- Krinkle
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Well not in core, but with help from tool labs...
https://commons.wikimedia.org/wiki/Category:Bicycles?fastcci=%7B%22c1%22%3A3...
--bawolff