There's reduced visibility and surface water because of rain on the M4 between J30 A4232 (Cardiff Gate) and J49 A48 / A483 (Pont Abraham Roundabout).
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The Welsh Government will later launch new plans to reduce the number of children living in poverty in Wales.
Plaid Cymru are to launch their campaign this morning ahead of May's general election.
A study by Swansea University has found a fifth of students in the UK have considered working in the sex industry to fund their studies.