|Length:||4.97 mi (8.00 km)|
|West end:||Parc Trostre|
North-east of the motorway, the road is classified as a non primary route, while south-west of the motorway, the road is classified as a primary route. In both instances, the road is operated by Carmarthenshire County Council.
- There have been proposals to make the southwestern section from the M4 to Llanelli a trunk road, which would be operated by the Welsh Assembly Government, but these have been rejected. 
- 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. 
Settlements served by the road include:
- Ordnance Survey. "1:50,000 Landranger Map". Retrieved 13 April 2012.
- Carmarthenshire County Council (12 December 2002). "REVIEW OF TRUNK ROADS IN WALES 2002". Retrieved 13 April 2002.