Traffic has now cleared after a vehicle fire caused delays on the M4.
One lane was closed on the eastbound exit slip road at junction 8, causing congestion for motorists this afternoon.
Fire crews from Maidenhead attended the scene and the lane has now re-opened.
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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.