How to interpet highway=construction?

I used OSM2PGSQL to load in many road type information.
According to OpenStreetMap guidelines, when construction is going on in a road, the road type is updated to highway: construction. Then, another tag should be added that says (e.g. construction: trunk_link). Not all of the roads that have highway:construction seem to have the construction tag as well. How can I get what type of road a road tagged as construction is? Are there other columns I can use? Is there a proper way to interpret highway=construction?

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