M4 closed J20–J21 westbound

Live Still reported at 23:47 UK time, since 22:43 (1 h 4 min).

Road closure on the M4 westbound at J20–J21 on Saturday 26 September 2026, from 22:43. Still reported at 23:47 UK time. Timeline of reports from National Highways.

1. ✕

   M4 westbound · J20–J21

   Road closed · cause not reported yet

   since 22:43 (1 h 4 min)

   National Highways

See the M4 on the live map M4 traffic now

Timeline

1. 22:43 National Highways: road closed

What the sources said

• M4 westbound between J20 and J21

Other recent incidents on the M4

• M4 closed J16–J17 westbound · 23:28, still reported
• M4 closed J17–J18 westbound · 23:28, still reported
• M4 closed J16–J17 westbound · 22:18, cleared after 38 min
• M4 closed J17–J18 westbound · 22:18, cleared after 38 min
• M4 closed J16–J17 westbound · 21:35, still reported
• M4 closed J19–J20 westbound · 21:35, still reported
• M4 closed J20–J21 westbound · 20:08, cleared after 2 h 17 min
• M4 crash J3–J2 westbound · 17:09, cleared after 42 min
• M4 crash J10–J8 eastbound · 12:42, cleared after 2 h 40 min
• M4 reported crash J17–J16 eastbound · 03:44, cleared after 1 h

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.