M4 traffic
London to south Wales. Incidents, roadworks and closures on the M4 in England and Wales, by junction and direction.
Accidents and incidents in England are not shown right now: National Highways' sign feed is not answering, and its closures feed carries roadworks only.
National Highways is not responding, so events in England may be missing.
No incidents on the M4 now, in Wales
11 entries in all. Source last updated 3 h ago.
At other hours: overnight or set times 9
- Lane closurewestbound
M4 J23, westbound
Overnight 21:00–06:00, until Wed 7 Oct
M4 · Westbound · J23 Rogiet · 05/10/26-07/10/26 2100-0600 · 1 lane closed · Carriageway maintenance
Traffic Wales · updated 19 h ago
- Slip road closurewestbound
M4 J23A to J24, westbound
Overnight 20:00–06:00, until Fri 9 Oct
M4 · Westbound · J23A Magor to J24 Coldra · 05/10/26-09/10/26 2000-0600 · Entry slip road closed · Surveys · Diversions in place
Traffic Wales · updated 20 h ago
- Slip road closureeastbound
M4 J24 to J22, eastbound
Overnight 20:00–06:00, until Fri 9 Oct
M4 · Eastbound · J24 Coldra to J22 Pilning/Prince of Wales Bridge · 05/10/26-09/10/26 2000-0600 · Entry slip road closed · Surveys · Closed · Diversions in place
Traffic Wales · updated 20 h ago
- Slip road closurewestbound
M4 J24, westbound
Overnight 20:00–06:00, until Fri 9 Oct
M4 · Westbound · J24 Coldra · 05/10/26-09/10/26 2000-0600 · Exit slip road closed · Surveys · Diversions in place
Traffic Wales · updated 20 h ago
- Full closureboth directions
M4 J25A to J27, both directions
Overnight 20:00–06:00, until Sat 10 Oct
M4 · Both directions · J25A Grove Park to J27 High Cross · 05/10/26-10/10/26 2000-0600 · Carriageway maintenance · Closed · Diversions in place
Traffic Wales · updated 20 h ago
- Slip road closureeastbound
M4 J32, eastbound
Overnight 20:00–06:00, until Wed 7 Oct
M4 · Eastbound · J32 Coryton · 05/10/26-07/10/26 2000-0600 · Offslip closed · Clearance work · Closed · Diversions in place
Traffic Wales · updated 20 h ago
- Slip road closureeastbound
M4 J35, eastbound
Overnight 19:00–06:00, until Tue 13 Oct
M4 · Eastbound · J35 Pencoed · 15/09/26-13/10/26 1900-0600 · Exit slip road closed · Clearance work · Diversions in place
Traffic Wales · updated 2 days ago
- Slip road closureeastbound
M4 J35, eastbound
Overnight 19:00–06:00, until Fri 9 Oct
M4 · Eastbound · J35 Pencoed · 15/09/26-09/10/26 1900-0600 · Clearance work · Exit slip road closed · Diversions in place
Traffic Wales · updated 15 September 2026
- Slip road closurewestbound
M4 J38 to J39, westbound
Overnight 20:00–06:00, until Sat 10 Oct
M4 · Westbound · J38 Margam to J39 Groes · 05/10/26-10/10/26 2000-0600 · Exit slip road closed · Entry slip road closed · Clearance work · Diversions in place
Traffic Wales · updated 20 h ago
Planned roadworks 2
- Full closureeastbound
M4 J28 to J24, eastbound
Starts Sun 11 Oct, overnight 20:00–06:00
M4 · Eastbound · J28 Tredegar Park to J24 Coldra · 11/10/26-17/10/26 2000-0600 · Clearance work · Closed · Diversions in place
Traffic Wales · updated 2 days ago
- Slip road closureeastbound
M4 J28 to J24, eastbound
Starts Mon 12 Oct, overnight 20:00–06:00
M4 · Eastbound · J28 Tredegar Park EB Onslip to J24 Coldra · Structural inspections · Bridge closed · Diversion · 12/10/26-13/10/26 2000-0600
Traffic Wales · updated 3 h ago
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What's closed, what's happened and tonight's works. Free, every morning or Mondays only.
Questions
- Is the M4 closed today?
- Not known right now: a source is unavailable (see above).
- Are there roadworks on the M4?
- Not known right now: a source is unavailable (see above).