Queensway Tunnel
The 289th longest tunnel in the world
The Queensway Tunnel (signposted as the Birkenhead Tunnel or B'head Tunnel) is a road tunnel under the River Mersey, in the north west of England, between Liverpool and Birkenhead. Locally, it is often referred to as the "old tunnel", to distinguish it from the newer Kingsway Tunnel (1971), which serves Wallasey and the M53 motorway traffic. At 2.13 miles (3.43 km) in length, it is the longest road tunnel in the UK.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).