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The A470, also known as the Cardiff to Glan Conwy Trunk Road, is the major long-distance road in Wales, from Cardiff on the south coast to Llandudno on the north coast. It is 185 miles long, and has undergone considerable road improvement in the last two decades. While previously one had to navigate the narrow roads of Llanidloes and Dolgellau, both these market towns are now bypassed due to extensive road modernisation.

The road travels through two of Wales's national parks, the Brecon Beacons (Bannau Brycheiniog) in the South and Snowdonia (Eryri) National Park, starting just south of Dinas Mawddwy in the North. It is a primary trunk route throughout its length, and the southernmost 26 miles, from Cardiff Bay to Merthyr Tydfil, is mainly direct and good-quality dual carriageway, but most of the route from north of Merthyr to Llandudno is single carriageway.
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