The Milan–Bologna segment opened on 13 December 2008. Its construction cost was about 6.9 billion euro. The line runs parallel to the Autostrada del Sole, crossing seven provinces and 32 municipalities. There are eight connections with historic lines. At the Reggio Emilia interconnection a new station designed by the Valencian architect Santiago Calatrava was opened in June 2013. Calatrava has also designed a signature bridge where the line crosses the A1 motorway. The line travels through a new multi-level station at Bologna (Italy's principal railway junction) designed by Japanese architect Arata Isozaki.