Traffic is slow on the M4 Westbound between Maidenhead and junction 10 for Wokingham and Bracknell due to accident investigation work.
The investigation is in relation to a car which left the road at 2.51am this morning.
More 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.