A4138
Route information
Length	4.97 mi (8.00 km)
Major junctions
East end	A48 at Pontarddulais
Major intersections	M4
West end	A484 at Parc Trostre
Location
Country	United Kingdom
Primary destinations	Llanelli
Road network
Roads in the United Kingdom Motorways A and B road zones

The A4138 is a main road in Carmarthenshire, Wales, connecting Pontarddulais with Llanelli. Running in a northeast to southwest direction, the road connects with M4 junction 48.^[1] Northeast of the motorway, the road is classified as a non-primary route, while southwest of the motorway, the road is classified as a primary route. In both instances, the road is operated by Carmarthenshire County Council.

Proposals

• There have been proposals to make the southwestern section from the M4 to Llanelli a trunk road, which would be operated by the Welsh Government, but these have been rejected.^[2]
• The local council has a policy to reject any planning application that would prevent or adversely affect the implementation of a dual carriageway between the M4 and Trostre.^[3]

Places served

Settlements served by the road include:

• Pontarddulais
• Hendy
• Llangennech
• Dafen
• Llanelli