To clarify, what I mean by "consequential" is that, the cover doesn't actually belong to the road. In this case, the cover is "caused" by another road going over it, so the underside road should never get "covered=yes".

I generally do not see "bridge parts" as useful data. That belongs to the topic "micro mapping" and it makes future "minor" edits more difficult to manage because suddenly I would be touching 10 other items that I never intended to touch.

"covered=yes" is reasonable in the following cases:
- full-cover sound barriers
- slope protection covers
- building "covers" that are pre-planned (!!!) such as Kwai Hing BT under a cover, upon which New Kwai Hing Gardens is built
- and perhaps more