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The Arlberg Road Tunnel (German: Arlberg Straßentunnel), with a length of 13.976 kilometres (8.684 mi), is Austria's longest road tunnel. When it was inaugurated, it was the longest road tunnel in the world. It carries the S16 Arlberg Schnellstraße (German for "Arlberg Highway") under the Arlberg massif from Tyrol to Vorarlberg.
The Inn Valley Motorway or Inntal Autobahn A12 is an autobahn in the Austrian federal state of Tyrol and part of Euroroutes E45 and E60.
It begins as a continuation of the German Bundesautobahn 93 on the German-Austrian border near Kiefersfelden/Kufstein and runs via Innsbruck (intersection with the Brenner Autobahn A13) to Zams, where it transitions to the S16 Arlberg expressway (Arlberg Schnellstraße). It runs parallel to the River Inn and runs through the Inn Valley fresh air region (Luftsanierungsgebiet).