There are long delays on the M4 in Berkshire this evening after an accident.
There are two lanes blocked westbound between junction 4b for the M25 and junction 5 for Langley (A4).
There are reports of long queues.
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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.