An accident has led to very slow traffic on the M4 this morning.
All lanes have been now re-opened between junction six near Slough and junction five near Langley.
The affected vehicles have been moved to the hard shoulder.
The incident caused tailbacks to the Maidenhead and has affected traffic flow in the town centre.
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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.