M4 closed J20–J21 westbound

Live Still reported at 21:39 UK time, since 20:27 (1 h 12 min).

Road closure on the M4 westbound at J20–J21 on Tuesday 6 October 2026, from 20:27. Still reported at 21:39 UK time. Timeline of reports from National Highways.

M4 westbound · J20–J21

Road closed · cause not reported yet

since 20:27 (1 h 12 min)

National Highways

See the M4 on the live map M4 traffic now

Timeline

20:27 National Highways: road closed

What the sources said

M4 westbound between J20 and J21

Other recent incidents on the M4

M4 closed J13–J14 westbound · 20:53, still reported
M4 closed J12–J13 westbound · 20:53, still reported
M4 closed J16–J17 westbound · 20:53, still reported
M4 closed J15–J16 westbound · 20:53, still reported
M4 crash J10–J11 westbound · 17:21, cleared after 1 h 9 min
M4 crash J7–J8 westbound · 07:47, cleared after 2 h 11 min
M4 stopped traffic J3–J2 · 06:43, cleared after 2 h 59 min
M4 closed J19–J20 westbound · yesterday 20:25, cleared after 7 h 41 min
M4 closed J19 westbound · yesterday 20:22, cleared after 7 h 44 min
M4 closed J20–J21 westbound · yesterday 20:22, cleared after 7 h 44 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.