M4 closed J20–J21 westbound

Live Still reported at 21:20 UK time, since 20:08 (1 h 12 min).

Road closure on the M4 westbound at J20–J21 on Saturday 26 September 2026, from 20:08. Still reported at 21:20 UK time. Timeline of reports from National Highways.

1. ✕

   M4 westbound · J20–J21

   Road closed · cause not reported yet

   since 20:08 (1 h 12 min)

   National Highways

See the M4 on the live map M4 traffic now

Timeline

1. 20:08 National Highways: road closed

What the sources said

• M4 westbound between J20 and J21

Other recent incidents on the M4

• 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
• M4 reported crash J17 westbound · 03:44, cleared after 1 h
• M4 reported crash J18–J17 eastbound · yesterday 11:52, cleared after 49 min
• M4 closed J3–J2 · Thu 22:50, cleared after 5 h 43 min
• M4 closed J41 · Wed 02:48, cleared after 3 h 9 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.