Drivers have been advised to seek alternative routes this weekend, with the M4 closed between J8/9 and J6 to allow roadworks to be carried out.
The closure came into force at 8pm on Friday evening and will remain in place across the weekend until the early hours of Monday morning.
The road is closed in both directions.
A diversion is in place via the outskirts of Windsor and the Bray Wick roundabout.
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