Drivers on the M4 faced delays up to two hours this morning due to congestion caused by emergency roadworks.
Two lanes were closed westbound after overnight works over-ran between Junctions 8/9 and 10 at about 6.45am.
All lanes have now re-opened but there are still queues tailing back from Junction 5 at Langley to Junction 10 at Wokingham.
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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.