At the end of 1993, the Swiss Confederation commissioned the BLS to provide a piggyback corridor along its line for road vehicles with a width of and a corner height of . The construction work began in January 1994 and the opening was delayed, due to geological problems on the southern side of the Simplon, until 11 June 2001. Since opening, the rolling highway, the transportation of trucks by rail from Germany to Italy via Lötschberg, has made a considerable contribution towards transferring transit traffic from road to rail.