ゴッタルド鉄道トンネル
After the Gotthard Road Tunnel, this is Switzerland's second-longest road tunnel but unlike the Gotthard Tunnel which crosses the Alps completely north to south, the Seelisberg Tunnel is situated only in the northern side of Alps. The Seelisberg tunnel can be considered to be the longest Swiss Road tunnel with split traffic (Southbound in one bore, and Northbound in another one).