Drivers travelling on the M4 this weekend are warned of a series of overnight closures plus a full weekend closure that could affect their journeys.
The start time of the full weekend closure between junction 4b for the M25 and junction 3 for Hayes has been delayed, and will begin at 4am on Saturday, January 15.
The closures in Berkshire are part of ongoing smart motorway works, despite the Government confirming the roll out of any new smart motorways will be delayed.
Read more: Drivers express frustration over M4 smart motorway delays
The Department for Transport announced the new road systems would not go live until five years of traffic safety data is available. However work will continue to upgrade the M4 in the meantime.
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The M4 weekend closure is due to begin in the early hours of Saturday.
Those travelling towards the M25 and Heathrow Airport or towards Berkshire from London are warned to expect delays as the motorway is closed all day Saturday until the early hours of Monday morning.
The road will be closed in both directions between 4b for the M25 and junction 3 for Hayes from 4am on Saturday, January 15. It is expected to reopen by 6am on Monday, January 17.
A diversion for those travelling eastbound towards London will take drivers via the M25 at junction 15 to junction 14, then onto the A3113 eastbound, before joining the A3044 northbound and onto the A4 eastbound and A312 northbound before re-joining the M4 at junction 3.
Those heading west will be diverted via the A312 southbound, A4 westbound, A3044 southbound, A3113 westbound before joining the M25 clockwise at junction 14 and leaving at junction 15 to rejoin the M4.
The M4 weekend closure is not due to start until the early hours of Saturday morning but drivers can also expect delays overnight on Friday, as a couple of stretches of the motorway are due to be closed.
Smart motorway works will see the eastbound carriageway closed between junction 6 for Slough and junction 5 for Langley, overnight on Friday, January 14.
The carriageway and entry slip road will be closed from 8pm on Friday and the road is expected to reopen at 6am on Saturday, January 15.
Drivers travelling further afield on Friday night or during the early hours of Saturday will be affected by a carriageway closure in Wiltshire.
The eastbound carriageway will be closed overnight between junction 17 for Chippenham and junction 16 for Swindon.
The M4 will be shut for resurfacing works from 10pm on Friday, January 14 and it is due to reopen by 6am on Saturday, January 15.
The eastbound slip road onto the motorway at junction 17 will also be closed.
A diversion will be in place via the A350, A4 and A3102 to junction 16.
The motorway will be closed in both directions from 8pm each Friday night with the affected stretches or road due to reopen by 6am on the Monday morning.
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