Nett1 day ago · As you enter Carmarthen follow the signs for the A40 St Clears. The Showground is about 1 mile west of Carmarthen on the dual carriageway. Travel on the A40 into Carmarthen and follow signs to St Clears as above. Take the A40 from St Clears towards Carmarthen and follow Showground signs on dual carriageway just before you …