Two lanes are closed and there's queueing traffic due to an accident on the M4 eastbound between J17 (Chippenham) and J16 (Swindon West).
Lanes one and two (of three) are currently closed. Three vehicles are involved.
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A mild evening will be overcast with wet spells. Some rainy patches will be heavy.
It will be mostly cloudy and mild with outbreaks of rain, some heavy. Windy, with gales possible in exposed areas.