A499 road

Its northern terminus is a roundabout with the A487 trunk road between Llanwnda and Llandwrog (53°05′41″N 4°16′57″W / 53.0948°N 4.2824°W / 53.0948; -4.2824 (A499 road (northern end))).

It then runs south-westerly along the northern coast of the peninsula, through Clynnog Fawr then turns inland crossing the peninsula to meet the southern coast at Pwllheli, it then follows that southern coast to terminate at Abersoch (52°49′22″N 4°30′19″W / 52.8227°N 4.5054°W / 52.8227; -4.5054 (A499 road (southern end))).

At no point is it a trunk road, although the Welsh Assembly has considered upgrading its status.

[1][2] Work started in February 2008 to upgrade the road between Aberdesach and Llanaelhaearn and also bypass Clynnog Fawr.

[3] Previous work in 2006/2007 had cleared the new route of trees and erected boundary fencing.