Constable
Hi there, this is probably the most recent news article about that bridge and they say it'll be opened in winter 2018 http://www.vigevano24.it/2017/11/03/leggi-notizia/argomenti/attualita-11/articolo/compare-la-prima-arcata-del-nuovo-ponte-sul-ticino-a-vigevano.html
Let's leave this note open until the bridge gets opened.
Be careful, this http://www.openstreetmap.org/way/39640202 road is not really suitable for pilgrims. It is a two lanes road (one per each direction) but the traffic is quite heavy, a lot of trucks and cars drive on it at 70/80kmh.
Feel free to ask if you need some advice about road choice in this area
Cheers