The A468 is a principal road from Newport

Newport

Newport is a city and unitary authority area in Wales. Standing on the banks of the River Usk, it is located about east of Cardiff and is the largest urban area within the historic county boundaries of Monmouthshire and the preserved county of Gwent...

 to Nantgarw

Nantgarw

Nantgarw is a village in the county borough of Rhondda Cynon Taf, Wales, near Cardiff.From an electoral and administrative perspective Nantgarw falls within the ward of Taffs Well, a village some 2.5 miles south, but historically fell within the boundaries of Caerphilly, which is a major town...

. The current route begins at the A467 in Bassaleg

Bassaleg

Bassaleg is a small semi-urban suburb on the west side of the city of Newport, in south Wales. It lies in the Graig electoral ward and community.- Location, communications & amenities:Bassaleg is located two miles north west of Newport city centre...

 then passes through Rhiwderin

Rhiwderin

Rhiwderin is a small village in the west of the city of Newport, South Wales.It lies in the community parish and electoral district of Graig.The original village lies across a level crossing off the main A468 Newport—Caerphilly road...

, Machen

Machen

Machen is a large village 3 miles east of Caerphilly, south Wales, situated in the Caerphilly borough within the historic boundaries of Monmouthshire. It neighbours Bedwas and Trethomas, and forms a council ward in conjunction with those communities. It lies on the Rhymney River.-Mynydd...

, Trethomas

Trethomas

Trethomas is a small village 2½ miles north-east of Caerphilly, south-east Wales, situated in the Caerphilly county borough, within the historic boundaries of Monmouthshire....

, Bedwas

Bedwas

Bedwas is a town two miles north-east of Caerphilly, south Wales, situated in the Caerphilly county borough, within the historic boundaries of Monmouthshire....

 and Caerphilly

Caerphilly

Caerphilly is a town in the county borough of Caerphilly, south Wales, located at the southern end of the Rhymney Valley, with a population of approximately 31,000. It is a commuter town of Cardiff and Newport, which are located some 7.5 miles and 12 miles away, respectively...

, terminating on the A470

A470 road

The A470 is a major long-distance connective spine road in Wales, running from Cardiff on the south coast to Llandudno on the north coast. It covers approximately 186 miles , over a zig-zagging route through the entirety of the country's mountainous central region, including the Brecon Beacons and...

. Originally the easternmost end of the road began at the Handpost Pub at the junction of the original route of the A467 and proceeded along Bassaleg Road before reaching the current starting point.