A tunnel is an underground passageway, completely enclosed except for openings for egress (openings for going out), commonly at each end. Listed below are the 5 longest road tunnels in the world.
1. Laerdal Road Tunnel, Norway
Laerdal Tunnel is the longest road tunnel of the world. It’s 24.51 km. long tunnel and connects the Norwegian cities of Laerdal & Aurland in the Sogn og Fjordane county.
Read more about Laerdal Tunnel at Wikipedia.
2. Zhongnanshan Road Tunnel, China
Zhongnanshan Tunnel or Qinling Zhongnanshan Tunnel is the 2nd longest road tunnel in the world. It is located in the Shaanxi province in China and is a part of the Xi’an-Ankang Highway between the Changan and Zhashui counties. The cost to build the tunnel was 3.2 billion yuan (US$410 million).The maximum embedded depth of the tunnel is 1640 metres below surface level.
Read more about Zhongnanshan Tunnel at TunnelBuilder.
3. St. Gotthard Road Tunnel, Switzerland
St. Gotthard Road Tunnel is the 3rd longest road tunnel in the world. It is located in Switzerland & runs from ‘Göschenen in the Canton of Uri‘ to ‘Airolo in Ticino’. The tunnel is a single bore tunnel with just one lane operating in each direction.
Read more about St. Gotthard Road Tunnel at Wikipedia.
4. Arlberg Road Tunnel, Austria
Arlberg Road Tunnel is the 4th longest road tunnel of the world. It is located in Austria & runs between Tyrol to Vorarlberg. The tunnel is 1228 m (4,030 feet) above sea level & is designed for 1800 vehicles per hour and equipped with 4 ventilation centres, 12 vents, 43 cameras for traffic monitoring and 16 niches.
5. Hsuehshan Road Tunnel, Taiwan
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Hsuehshan Road Tunnel is the 5th longest road tunnel in the world. It’s located in Taiwan and connects the city of Taipei to the northeastern county of Yilan (Ilan). One of the key aims of constructing the tunnel was to connect the western coast of Taiwan, where 95% of the population lives, to the eastern coast of the island and in doing so tackle the unbalanced development on the island. It is constructed with one pilot tunnel and two main tunnels for eastbound and westbound traffic.
Read more about Hsuehshan Road Tunnel on Wikipedia.