structural:scholar_edition, linguistic:paraphrasing, structural:reformatting, stylistic:tone, linguistic:voice_change
Transportation

The region is serviced by 4,200 km (2,600 mi) of roads used by six million vehicles per year. Train travel is well established in the Alps, with, for instance 120 km (75 mi) of track for every 1,000 km (390 sq mi) in a country such as Switzerland. Most of Europe's highest railways are located there. In 2007, the new 34.57 km-long (21.48 mi) Lötschberg Base Tunnel was opened, which circumvents the 100 years older Lötschberg Tunnel. With the opening of the 57.1 km-long (35.5 mi) Gotthard Base Tunnel on June 1, 2016, it bypasses the Gotthard Tunnel built in the 19th century and realizes the first flat route through the Alps.