Among the A roads in Zone 5 of the Great Britain, Road A55, sometimes called the "North Wales Expressway", is the road running from Holyhead to Chester.
The A55, also known as the North Wales Expressway (Welsh: Gwibffordd Gogledd Cymru) is a major road in Britain. Its vast majority of its length from Chester to Holyhead is a dual carriageway primary route, with the exception of the Britannia Bridge over the Menai Strait and several short sections where there are gaps in between the two carriageways. Each road is given a single letter, which represents the road's category, and a subsequent number, of 1 to 4 digits. Zone 5: North/East of the A5, west of the A6, south of the Solway Firth/Eden Estuary covering North Wales, North Midlands, western Leicestershire, Cheshire, Cumbria and western Lancashire. In Central London, the A40 (Holborn Viaduct, Holborn, High Holborn and Oxford Street) provides a border between the 4 and 5 zones east of Marble Arch. The original A5 (now renumbered A5183) also provides such a border, and north of St Albans the original A6 (now renumbered A1081) provides an Eastern border. 
