A55

A55 is a road designation used in multiple national road networks. The best known is the A55 road in the United Kingdom, commonly called the North Wales Expressway. It runs from Holyhead on the island of Anglesey to Chester on the Wales–England border, forming a principal cross-border route and a corridor for freight and tourism into North Wales.

The route follows a substantial portion of the North Wales coastline, linking coastal towns and communities such as Bangor, Conwy, Llandudno, Rhyl, Prestatyn, and Flint, before connecting with other major roads near Chester. The majority of the A55 is a dual carriageway, with shorter single-carriageway sections in towns and service areas. It is maintained as part of the UK trunk road network, with responsibilities shared between the Welsh Government and local authorities, and improvements funded through national transport programs.

Upgrading and maintenance on the A55 have focused on increasing capacity and safety, including widening of sections, upgraded interchanges, and new or resurfaced alignments. As a cross-border route, it remains a key north–south corridor in North Wales, supporting passenger travel, local commerce, and access to international ferry connections from Holyhead.

Other uses: The A55 designation is used in some other countries for their own major roads; as a result, the term A55 can refer to routes other than the UK path depending on the country. For precise information, consult the national or regional transport authority in the relevant jurisdiction.