A487 road

The A487 is a major road in Wales, running up the west coast.

It starts in Haverfordwest, from where it travels north west to St David's, then switches back north east through Fishguard, Cardigan, Aberaeron, Aberystwyth, Machynlleth, Corris and Dolgellau. It then merges with the A470 road, re-emerging just north of Trawsfynydd. The road continues via Portmeirion, Porthmadog and Caernarfon before terminating at the foot of the Menai Suspension Bridge near Bangor.

The section of road in the Dulas valley between Corris and the Afon Dyfi near Machynlleth was built in the 1840s at the instigation of the local slate quarry owners to replace the old turnpike road on the opposite side of the valley. It may have utilised part of the formation of the Roman Sarn Helen. From 1859 the road was kept company on this section by the narrow-gauge Corris Railway.