Article from 2016 talking about the people that designed and built the bridge: http://www.ingegneri.info/news/infrastrutture-e-trasporti/po... (in Italian, Google Translate may help with it).
As for people asking why the highway needs to go through Genova instead of around, it's probably the same kind of reasoning that leads to using nuclear bombs to build harbors and the like.
Mountains. And a few of the major highways actually go under Genoa, via tunnels.
I'm guessing what happened here is neither maintenance nor (planned) demolition.
on archive.is: http://archive.is/nZ9rF