One lane is blocked and there's queueing traffic after an accident on the A470 Southbound at the A468 Caerphilly Road / A4054 (Nantgarw Interchange). There's congestion to the A4054 Cardiff Road / Gwaelod-y-garth Road (Upper Boat Interchange).
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It should continue to become drier and brighter from the west. However, a sharp shower is possible.
The heaviest bursts are expected in the south and east, with some western areas either remaining dry or becoming dry by dawn.