As of 2025, here are the ten longest road tunnels in the world, ranked by length:
1. Lærdal Tunnel (Norway)
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Length: 24.51 km (15.23 miles)
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Opened: 2000
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Details: Connects Lærdal and Aurland in western Norway. It is the longest road tunnel in the world and includes rest areas with lighting to reduce driver fatigue.
2. Yamate Tunnel (Japan)
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Length: 18.2 km (11.3 miles)
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Opened: Fully completed in 2015
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Details: Part of Tokyo's Central Circular Route. It's mostly a double-deck underground tunnel through a dense urban area.
3. Zhongnanshan Tunnel (China)
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Length: 18.04 km (11.21 miles)
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Opened: 2007
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Details: Passes through the Qinling Mountains in Shaanxi Province. It's the longest two-tube road tunnel in China.
4. SMART Tunnel (Malaysia)
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Length: 13.2 km (8.2 miles)
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Opened: 2007
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Details: Stands for Stormwater Management and Road Tunnel, serving as both a road tunnel and a stormwater drainage system in Kuala Lumpur.
5. Ryfylke Tunnel (Norway)
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Length: 14.4 km (8.9 miles)
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Opened: 2019
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Details: The deepest subsea road tunnel in the world, reaching a depth of 292 meters below sea level.
6. Tokyo Bay Aqua-Line Tunnel (Japan)
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Length: 9.6 km (6.0 miles) (tunnel portion)
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Opened: 1997
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Details: Connects Kawasaki and Kisarazu under Tokyo Bay. Includes a bridge section; the tunnel is part of a hybrid bridge–tunnel system.
7. St. Gotthard Road Tunnel (Switzerland)
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Length: 16.9 km (10.5 miles)
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Opened: 1980
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Details: One of the most important north–south trans-Alpine routes. A second tunnel is under construction.
8. Mount Ovit Tunnel (Turkey)
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Length: 14.3 km (8.9 miles)
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Opened: 2018
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Details: Connects the Black Sea region with Eastern Anatolia.
9. Jinpingshan Tunnel (China)
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Length: 17.54 km (10.9 miles)
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Opened: 2011
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Details: Located in Sichuan Province, built as part of a hydropower station road network.
10. Arlberg Road Tunnel (Austria)
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Length: 13.97 km (8.68 miles)
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Opened: 1978
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Details: Connects Tyrol and Vorarlber
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