A full weekend closure returns to the M4 as smart motorway works continue.
The road will be shut near Slough from Friday, November 19 until the early hours of Monday, November 22.
Drivers are warned to expect delays on the motorway and in the surrounding areas.
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The closure is part of National Highways' (formerly Highways England) £848m project to convert the motorway into four running lanes between junction 3 at Hayes and junction 12 in Theale.
Most of the Berkshire stretch of the M4 will be controlled by cameras, with no hard shoulder and refuge points for drivers who need to stop.
The motorway will be closed between junction 5 for Langley and junction 6 for Slough from 8pm on Friday, November 19 and it is due to reopen by 6am on Monday, November 22.
The M4 will be shut in both directions and drivers are warned to expect delays and leave extra time for their journey, or find alternative routes if possible.
A signed diversion will be in place with drivers diverted off the M4 and onto the A4 and A355 or this route in reverse. Other traffic should follow local diversions.
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