Traffic is gridlocked on the M4 following a serious accident this afternoon.
Fire crews from Wokingham and Maidenhead are attending the crash.
It happened between junction 10 for Wokingham and junction 8/9 for Maidenhead on the eastbound carriageway.
Delays are being caused on both the eastbound and westbound carriageways on the motorway.
UPDATE 3.05pm: All lanes have now been reopened but traffic is still moving slowly in both directions.
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