The Queensway 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 "Birkenhead tunnel" or "old tunnel", to distinguish it from the newer Kingsway tunnel (1971), which serves Wallasey and the M53 motorway traffic. At 3.24 kilometres (2.01 mi) in length, it is the longest road tunnel in the UK.