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

TheA4138 is a main road inCarmarthenshire,Wales, connectingPontarddulais withLlanelli. Running in a northeast to southwest direction, the road connects withM4 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 byCarmarthenshire County Council.

• There have been proposals to make the southwestern section from the M4 to Llanelli a trunk road, which would be operated by theWelsh 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 theM4 andTrostre.^[3]

Settlements served by the road include:

• Pontarddulais
• Hendy
• Llangennech
• Dafen
• Llanelli

• Roads in Wales
• Transport in Carmarthenshire

• Articles with short description
• Short description matches Wikidata
• Use dmy dates from January 2023
• Use British English from February 2013
• Infobox road instances in the United Kingdom
• Pages using gadget WikiMiniAtlas
• Articles using KML from Wikidata