Start date: 28/09/2025| End date: 25/01/2026
Essential works to address hazardous trees adjacent to the M4 between J33 (Cardiff West Interchange) and the Prince of Wales Bridge will commence on 28/09/2025 for 4 months.
The work will be undertaken during the night between 20:00 and 06:00 utilising mostly hard shoulder and lane closures; however, some total slip road closures will be required to provide the necessary safety zones. Signed diversions will be put in place during total closures.
No works will be undertaken during the Christmas embargo period between 19/12/2025 and 05/01/2026.
Closures as follows -
EASTBOUND
- J26 & J25a On-Slip - (11/11/2025 - 26/11/2025)
- J24 Off-Slip - (24/11/2025 - 26/11/2025)
- J24 On-Slip - (26/11/2025 - 27/11/2025)
- J23a Off-Slip - (30/11/2025 - 01/12/2025)
J23a On-Slip - (01/12/2025 - 02/12/2025)
- WESTBOUND
- J23a Off-Slip - 04/12/2025 - 05/12/2025
- J23a On-Slip & Inner Ring - 07/12/2025 - 08/12/2025
- J24 Off-Slip - 11/12/2025 - 12/12/2025
- J24 On-Slip - 14/12/2025 - 15/12/2025
- J25 Off-Slip - 13/01/2026 - 15/01/2026
- A4042 & J25a Off-slip - 15/01/2026 - 16/01/2026
- J26 On-Slip - 19/01/1026 - 20/01/2026
- J27 Off-Slip - 25/01/2026 - 27/01/2026
**Please note, programme may be subject to change.
Signed diversions will be put in place during total closures.