There's queueing traffic after an accident which is now on the hard shoulder on the M4 Westbound between J32 A470 / A4054 (Coryton Interchange) and J33 A4232 (Cardiff West And Services). All lanes have been re-opened.
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Kenyans Eliud Kipchoge and Vivian Cheruiyot won the men's and women's races respectively, in a scorching hot London Marathon.
Most areas will have a dry night with some clear spells.
The collision took place on the A525 Denbigh bypass at around 11pm and involved a blue Porche Cayman.