World's Longest Road Tunnels

About This Dataset

Road tunnels ranked by total length in kilometres. Norway's Lærdal Tunnel is the world's longest road tunnel at 24.5 km, connecting the towns of Lærdal and Aurland through the mountains of western Norway. It was designed with three large mountain caverns and special lighting to combat the psychological strain of driving through such a long enclosed space.

✨ AI Insight

The significant gap between the Lærdal Tunnel and its closest competitor, the Zhongnan Mountain Tunnel, highlights the extraordinary scale of Norway's engineering achievement. At 24.51 km, Lærdal Tunnel surpasses Zhongnan by over 6 km, reflecting Norway's unique geographical challenges and commitment to infrastructure. The trend shows that while many countries have invested in long tunnels, Norway's focus on connecting its mountainous terrain has resulted in the longest road tunnel to date. Notably, the presence of multiple tunnels from Europe, such as the Gotthard and Arlberg, suggests a concentrated effort in that region to enhance connectivity through mountainous landscapes.

Source: Wikipedia

Key Findings

Auto-computed highlights from this dataset

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Laerdal Tunnel (Norway) leads with 25 in All Time.

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Average value in All Time: 15 · median: 13.

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Gap in All Time: Laerdal Tunnel (Norway) is 2.1× larger than Gudvanga Tunnel (Norway).

World's Longest Road Tunnels

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Data Insights Below

Data Insights

Numbers, trends & sources behind this chart

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Data Points

8 categories · 1 year

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Top Value

24.51

Laerdal Tunnel (Norway)

Length (km) · All Time

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Metrics

Length (km)

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Period

All Time

Single year snapshot

Rankings & Full Data

8 records · Length (km) · ranked by All Time

✓ 8 sourced

#	Category	All Time
🥇	Laerdal Tunnel (Norway)	24.51
🥈	Zhongnan Mountain Tunnel (China)	18.04
🥉	Gotthard Road Tunnel (Switzerland)	16.93
4	Arlberg Tunnel (Austria)	13.97
5	Hsuehshan Tunnel (Taiwan)	12.90
6	Frejus Road Tunnel (France/Italy)	12.87
7	Mont Blanc Tunnel (France/Italy)	11.61
8	Gudvanga Tunnel (Norway)	11.43