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Rydym yn croesawu galwadau’n Gymraeg. We welcome calls in Welsh.
Rydym yn croesawu galwadau’n Gymraeg. We welcome calls in Welsh.

M4 J38 Margam Interchange Bridge: Maintenance Works

Start date: 12/07/24 End date: 22/07/24

M4 J38 Margam Interchange

Overnight and weekend closures to complete essential bridge maintenance works on the South Bridge at Junction 38 Margam Interchange.

12 July 20:00 - 15 July 06:00

  • Full weekend closure of the South Bridge at M4 Junction 38 interchange
  • M4 J38 Eastbound on-slip will also be closed.

15 - 22 July 

  • Overnight closures from 20:00 - 06:00  to complete the works at the South Bridge at M4 Junction 38 interchange.
  • M4 J38 Eastbound on-slip will also be closed.

Motorway users - southbound along the A48 to M4 Junction 37.

Non-motorway traffic – diversion southbound via the A48, then follow the A473, A4063, B4282 and the A4107 to reach Margam. This applies to provisional license holders (who are not accompanied by a DVSA approved driving instructor), riders of motorcycles under 50cc and agricultural vehicles. 

Traffic will be unable to join the M4 eastbound via J38 eastbound on slip and traffic will not be able to access Port Talbot from the M4 J38 South Bridge Roundabout.

For further information, please contact Traffic Wales on 0300 123 1213, via X @TrafficWalesS or via Twitter @TrafficWalesS.