Hindhead Tunnel

The Hindhead Tunnel, opened in 2011, is part of the 4-mile (6.4 km) dual carriageway that replaced one of the last remaining stretches of single carriageway on the A3 road which connects the cities of London and Portsmouth. It was built to bypass the village of Hindhead in Surrey. At 1.14 miles (1.83 km) in length, the tunnel is the longest non-estuarial road tunnel in the United Kingdom, and takes the road beneath the Devil's Punch Bowl, a Site of Special Scientific Interest.

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Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).

Other tunnels in United Kingdom

Delaware Aqueduct United States · 137 km Päijänne Water Tunnel Finland · 120 km Orange–Fish River Tunnel South Africa · 82.8 km Ishikawa Tunnel Japan · 78.5 km Brenner Base Tunnel Austria · 64 km Mont d'Ambin base tunnel France · 57.5 km Gotthard Base Tunnel Switzerland · 57.09 km Hong Kong–Zhuhai–Macau Bridge China · 55 km