Being 25 km long the Laerdal Tunnel i Norway is the world's longest road tunnel - and it is equipped with support and cable ladders from Oglaend System. To ease the drive through the 25 km long tunnel, there is a huge hall every 6 km.
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It is part of the Norwegian National Road 13 running between Stavanger and Ryfylke (district) under the Horgefjord (part of the Boknafjord). The tunnel is part of the Ryfast project. It is 14.4 kilometres (8.9 mi) long and is currently the world's longest subsea road tunnel, and the deepest tunnel of any kind.
The Apennine Base Tunnel, alternatively known as the Grand Apennine Tunnel, is a railway base tunnel 18.507 kilometres (11.500 mi) long on the Bologna-Florence Direttissima line in central Italy.
The Laerdal Tunnel in western Norway is the longest road tunnel in the world. It takes about 20 minutes to pass through the tunnel. Brightly colored lights placed every six kilometers help drivers stay alert.
In cooperation with Rönesans Holding, the Heitkamp Construction Swiss GmbH tunnel and railroad construction specialists constructed the world's longest and deepest tunnel, the Gotthard Base Tunnel. This 57 kilometre-long tunnel lies at a depth of 2,300 metres.
With its 57 km, the Gotthard base tunnel is the longest railway tunnel in the world, and the core of the new transalpine railway axis AlpTransit. The twin single track high speed rail tunnels run between Erstfeld and Bodio in Switzerland.
Despite this, it's not as easy as this. The Channel Tunnel, in fact, has the longest underwater section, with 39 km against the 23 km of its Japanese rival. Nevertheless, the title of the world's longest still goes to the Seikan tunnel.
At 24 kilometers or just over 15 miles in length, Norway's Lærdal Tunnel is the longest tunnel in the world. Assuming no traffic, it takes about 18 minutes to drive through this road tunnel if you're going the speed limit of 80 km/hr.
The Seikan Tunnel (Japanese: ??????, Seikan Tonneru or ????, Seikan Zuido) is a 53.85 km (33.46 mi) dual-gauge railway tunnel in Japan, with a 23.3 km (14.5 mi) portion under the seabed of the Tsugaru Strait, which separates Aomori Prefecture on the main Japanese island of Honshu from the northern island of Hokkaido.
Seikan Tunnel, JapanConstruction of the Seikan tunnel experienced many technical challenges as the infrastructure sits through an earthquake-prone zone. The engineers couldn't use tunnel boring machines (TBM) as the rock and soil underneath the Tsugaru Strait was arbitrarily unpredictable.
On October 2, 1925, the tunnel collapsed on a work train, killing four men and trapping a steam locomotive and ten flat cars. Rescue efforts only resulted in further collapse, and the tunnel was eventually sealed for safety reasons. Richmond, Virginia, U.S.