M4 junctions 6 at Slough/Windsor to 12 at Theale, Berkshire: upgrade to smart motorway
Work to improve journeys by converting the M4 into a smart motorway between Junctions 3 at Hayes to Junction 12 at Theale continues this week. 24 hour narrow lanes and a 50mph speed restriction are in place for sections of this stretch of the M4. Carriageway and slip road closures are planned as follows, all fully closed overnight between approximately 10pm and 5am (traffic management will usually be rolled out from 9pm and taken off by 6am). In the event of poor weather conditions or other issues out of our control, planned work may be postponed at short notice. If work completes on an earlier day the motorway may not close, or if work completes ahead of schedule the motorway may reopen early. Signage will be in place on the network to notify of closures.
The M4 eastbound carriageway between junctions 12 (Theale) and 11 (Reading) will be closed overnight on Monday 11 March. Clearly signed diversions will be in place utilising the A4 and the A33. This is a contingency booking should work at the weekend be delayed. The M4 eastbound carriageway between junctions 8/9 (Maidenhead) and 6 (Slough/Windsor) will be closed overnight on Monday 11 and Tuesday 12 March. Clearly signed diversions will be in place utilising the westbound M4, A308M, A308 and the A332. Contingency bookings are in place on Wednesday 13 and Thursday 14 March should work be delayed. The M4 westbound carriageway between junctions 8/9 (Maidenhead) and 10 (Wokingham) will be fully closed overnight on Saturday 16 March. Clearly signed diversions will be in place utilising the A404, A4, A3290 and the A329M. A contingency booking is in place on Sunday 17 March should work be delayed. The M4 eastbound carriageway between junctions 10 (Wokingham) and 8/9 (Maidenhead) will be fully closed overnight on Sunday 17 March. Clearly signed diversions will be in place utilising the A404, A4, A3290 and the A329M. If the westbound contingency booking is used, this will not go ahead. The following additional slip road closures are booked.
At junction 7 of the M4 eastbound the exit slip will be closed overnight on Monday 11 and Tuesday 12 March as part of the 8/9 to 6 closure above. Contingency bookings are in place every night from 13 to 17 March should work be delayed. At junction 10 of the M4 eastbound the entry slip from the northbound A329M (Slip 5) will be closed overnight on Monday 11 and Tuesday 12 March. Contingency bookings are in place every night from 13 to 15 March should work be delayed.