The A499 road is the major road of the Llŷn peninsula

Llyn Peninsula

The Llŷn Peninsula extends into the Irish Sea from north west Wales, south west of the Isle of Anglesey. It is part of the modern county and historic region of Gwynedd. The name is thought to be of Irish origin, and to have the same root Laigin in Irish as the word Leinster...

 in North Wales

North Wales

North Wales is the northernmost unofficial region of Wales. It is bordered to the south by the counties of Ceredigion and Powys in Mid Wales and to the east by the counties of Shropshire in the West Midlands and Cheshire in North West England...

.

Its northern terminus is a roundabout with the A487 trunk road

A487 road

The A487 is a trunk road in Wales, running up the western side of the country from Haverfordwest in the south to Bangor in the north.It starts at Merlin's Bridge near Haverfordwest, from where it travels north west to St David's, then switches back north east through Fishguard, Cardigan, Aberaeron,...

 between Llanwnda

Llanwnda, Gwynedd

Llanwnda is a village in Gwynedd, Wales. It has a population of roughly 1,000. It is situated about 3 miles to the south of Caernarfon, and 5 miles south-west of Llanrug. It contains the Fort Belan, built in 1775.- External links :*...

 and Llandwrog

Llandwrog

Llandwrog is a village and community in Gwynedd, north-west Wales, most notable for the presence of the headquarters of Welsh record label Sain and the site of Caernarfon Airport...

  It then runs south-westerly along the northern coast of the peninsula, through Clynnog Fawr

Clynnog Fawr

Clynnog Fawr, often simply called "Clynnog", is a village on the north coast of the Llŷn peninsula in Gwynedd, north-west Wales.Clynnog Fawr lies on the A499 road between Caernarfon and Pwllheli, at . It had a population of 130 in 1991...

 then turns inland crossing the peninsula to meet the southern coast at Pwllheli

Pwllheli

Pwllheli is a community and the main market town of the Llŷn Peninsula in Gwynedd, north-western Wales. It has a population of 3,861, of which a large proportion, 81 per cent, are Welsh speaking. Pwllheli is the place where Plaid Cymru was founded. It is the birthplace of Albert Evans-Jones -...

, it then follows that southern coast to terminate at Abersoch

Abersoch

Abersoch is a large village in the community of Llanengan in Gwynedd, Wales. It is a popular coastal seaside resort with approximately 1,000 inhabitants, on the east-facing south coast of the Llŷn Peninsula at the southern terminus of the A499. It is about south-west of Pwllheli and south-west of...

 

The total length is 23.4 miles. At no point is it a trunk road, although the Welsh Assembly has considered upgrading its status.

Improvements

Work started in February 2008 to upgrade the road between Aberdesach

Aberdesach

Aberdesach is a village in the Welsh principal area of Gwynedd.- External links :*...

 and Llanaelhaearn

Llanaelhaearn

Llanaelhaearn is a village and community in the Welsh county of Gwynedd, located on the Llŷn Peninsula. The community includes the village of Trefor, and has a population of 1,067....

 and also bypass Clynnog Fawr

Clynnog Fawr

Clynnog Fawr, often simply called "Clynnog", is a village on the north coast of the Llŷn peninsula in Gwynedd, north-west Wales.Clynnog Fawr lies on the A499 road between Caernarfon and Pwllheli, at . It had a population of 130 in 1991...

. This work is expected to complete in Summer 2009. Previous work in 2006/2007 had cleared the new route of trees and erected boundary fencing.