A blue sign with a diagram showing a roundabout with four arms and the following text.
Forward destinations: Caerfyrddin; Carmarthen A48 .
Left turn destinations: Gwasanaethau; Services.
Right turn destinations: Llandeilo; Rhydaman; Ammanford; A483.
Junction number: 49.
The A48 - which has been by our side since we arrived on Welsh soil back at Caldicot - is here to take you onward to Carmarthen and Pembrokeshire, if you want to make your way further west. But the M4 ends here.