Drivers are once again encouraged to stay vigilant as work continues on a major commuting highway this week. 

National Highways has released its full list of closures for this week on the M4 where crucial roadworks will be taking place. 

The full list of planned closures is as follows: 

 

Monday September 23

M4-Westbound

M4 westbound Jct 12 entry slip road closure from 9 pm to 6am. 

M4 westbound Jct 18 entry slip closed from 9 pm to 6am. 

M4 westbound Jct 16 entry slip closure from 8 pm to 6am. 

M4 westbound Jct 16 to Jct 17 carriageway closure from 8 pm to 6am. 

 

Tuesday September 24

M4-Westbound

M4 westbound Jct 12 entry slip road closure from 9 pm to 6 am. 

M4 westbound Jct 18 entry slip closed from 9 pm to 6 am. 

 

M4-Eastbound

M4 Eastbound Jct 20 Exit Slip Road to M5 Northbound Closure from 9 pm to 6 am. 

 

Wednesday September 25

M4 westbound Jct 12 entry slip road closure from 9 pm to 6 am. 

M4 westbound jct 4 exit slip road closure from 10 pm to 5.30 pm. 

M4 westbound Jct 18 entry slip closed from 9 pm to 6 am. 

M4 westbound Jct 21 to 23 Prince of Wales Bridge closure 9.30 pm to 6 am. 

 

M4-Eastbound

M4 eastbound Jct 23 to 22 Prince of Wales Bridge carriageway closure from 9.30 pm to 6 am. 

 

Thursday September 26

M4-Westbound

M4 westbound Jct 12 entry slip road closure from 9 pm to 6 am. 

M4 westbound jct 4 exit slip road closure 10 pm to 5.30 am.

M4 westbound Jct 18 entry slip closed  9 pm to 6 am.