M4 closed J20–J21 westbound

Road closure on the M4 westbound at J20–J21 on Tuesday 20 October 2026, from 21:17. Still reported at 23:01 UK time. Timeline of reports from National Highways.

Status

Live since 21:17 (1 h 44 min)

Location

M4 westbound · J20–J21

Reported as

Road closed · cause not reported yet

Lanes

Road closed

Sources

National Highways

Timeline

1. 21:17 National Highways: road closed

Source reports

• M4 westbound between J20 and J21

Other recent incidents on the M4

• M4 crash J6–J5 eastbound14:41 · cleared after 1 h 42 min
• M4 stopped traffic J13–J12 eastbound12:38 · cleared after 1 h 49 min
• M4 stopped traffic J13–J1212:04 · cleared after 28 min
• M4 crash J10 westbound11:57 · cleared after 2 h 5 min
• M4 reported crash J13–J12 eastbound11:48 · cleared after 58 min
• M4 reported crash J13–J12 eastbound07:24 · cleared after 51 min
• M4 stopped traffic J20–J2107:14 · cleared after 2 h 19 min
• M4 crash Eastboundyesterday 18:36 · cleared after 6 h 25 min
• M4 stopped traffic J14–J15yesterday 13:41 · cleared after 32 min
• M4 crash J18 eastboundyesterday 06:45 · cleared after 6 h 56 min

The sources don't report causes or injuries, so neither does this page. Times are UK time. For alerts, follow @motorways.me on Bluesky.