The route begins at the junction with Hall Street and Gelli-onn, on the A484 road in northwest Llanelli. At this point,the road is a dual-carriageway as it heads south-east along Hall Street to the Public Library, then south-west along Church Street and past the town council, government buildings, then south-east again past the town hall and county council offices. Here, the road turns into a single-carriageway as it becomes Station Road to the junction with the B4303 and Queen Victoria Road. The road takes a 90-degree to the north-east along Murray Street towards the Asda Supermarket.
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