Trunk road running between Chester, Cheshire and Bangor, Gwynedd.
It passes through Queensferry in Flintshire, then Colwyn Bay and Conwy in Conwy. It is the main thoroughfare through along north Wales into England.
Intersections:
- M53/A56/A41 at Chester
- A51 at Chester
- A41 at Chester
- A483 at Chester
- A5104 at Braughton
- A5104 at Braughton
- A550 at Buckley
- A494 at Buckley
- A5119 at Northop
- A5026 at Halkyn
- A5026/A5151 at Pant y Wacco
- A525 at St. Asaph
- A525 at St. Asaph
- A547 at Abergele
- A548 at Abergele
- A547 at Llanddulas
- A547 at Rhos-on-Sea
- A547 at Llandudno Junction
- A470/A547 at Llandudno Junction
- A547 at Conwy
- A5/A5122 at Tal-y-Bont