Drivers are experiencing delays on the M4 westbound after a collision involving a van between junctions J6 and J7 near Slough.
Highways England is warning of delays of about 30 minutes as one lane is closed to allow for emergency repairs to a central barrier.
Updates to follow.
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The Met Office has issued a yellow alert for Windsor and Maidenhead, Slough and Wokingham, warning that rain moving eastwards across the south of the country may turn to snow in some places.