M4 closed J20–J21 westbound

Live Still reported at 21:19 UK time, since 19:52 (1 h 27 min).

Road closure on the M4 westbound at J20–J21 on Sunday 27 September 2026, from 19:52. Still reported at 21:19 UK time. Timeline of reports from National Highways and TomTom.

1. ✕

   M4 westbound · J20–J21

   Road closed

   since 19:52 (1 h 27 min)

   National Highways ×2 · TomTom

See the M4 on the live map M4 traffic now

Timeline

1. 19:52 National Highways: road closed
2. 20:55 TomTom: queueing traffic, “Stationary traffic”, delay ~12 min
3. 21:00 TomTom no longer reports it
4. 21:03 National Highways: road closed
5. 21:09 TomTom: queueing traffic, “Stationary traffic”, delay ~11 min (reported again)
6. 21:14 TomTom no longer reports it

What the sources said

• M4 westbound between J20 and J21
• Stationary traffic

Other recent incidents on the M4

• M4 closed J15–J16 westbound · 20:01, still reported
• M4 closed J13–J14 westbound · 20:01, still reported
• M4 closed J12–J13 westbound · 20:01, still reported
• M4 closed J16–J17 westbound · 20:01, still reported
• M4 crash J3 westbound · 00:02, cleared after 1 h 26 min
• M4 closed J16–J17 westbound · yesterday 23:28, cleared after 3 h 7 min
• M4 closed J17–J18 westbound · yesterday 23:28, cleared after 5 h 23 min
• M4 closed J20–J21 westbound · yesterday 22:43, cleared after 6 h 8 min
• M4 closed J16–J17 westbound · yesterday 22:18, cleared after 38 min
• M4 closed J17–J18 westbound · yesterday 22:18, cleared after 38 min

About this page

This page shows what the data sources reported about this event and when, merged from every source that reported it at the same place. It doesn't say what caused it or whether anyone was hurt: no source reports that. Times are UK time. For live alerts, follow @motorways.me on Bluesky.