Repairs to a pipeline running to the Valero Pembroke Refinery have closed a lane on one of the busiest roads in west Wales.
The eastbound A48 in Carmarthenshire has closed for six weeks between Carmarthen and Nantycaws and long delays are expected.
The carriageway will be closed until October 28.
Mainline Pipelines Ltd said it would aim to reopen the road as soon as possible.
The old Nantycaws bypass will be used for diversions.
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