The A4061, Bwlch Mountain Road, in Rhondda Cynon Taf has been closed due to snow. The Brynamman and Maerdy mountain roads are also closed until further notice.
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It is going to stay fine and dry through the night with light winds.
It is going to stay fine and dry throughout.
There have been four deaths on the M4 in just the last eight days following crashes between Swansea and Newport.