M4 crash J4–J4B westbound

Live Still reported at 09:58 UK time, since Fri 08:09 (337 h 48 min).

Crash on the M4 westbound at J4–J4B on Friday 25 September 2026, from 08:09. Still reported at 09:58 UK time. Timeline of reports from the motorway signs and TomTom.

1. !

   M4 westbound · J4–J4B

   Collision

   since Fri 08:09 (337 h 48 min)

   Motorway signs ×3 · TomTom

See the M4 on the live map M4 traffic now

Timeline

1. Fri 08:01 Motorway signs: “REPORT OF OBSTRUCTION”
2. Fri 08:40 Motorway signs no longer show “REPORT OF OBSTRUCTION”
3. Fri 08:40 All clear: no source reports it any more
4. Mon 21:38 Motorway signs: “REPORT OF OBSTRUCTION” (reported again)
5. Mon 22:08 Motorway signs no longer show “REPORT OF OBSTRUCTION”
6. Mon 22:08 All clear: no source reports it any more
7. Tue 16:12 Motorway signs: “REPORT OF OBSTRUCTION” (reported again)
8. Tue 16:42 Motorway signs no longer show “REPORT OF OBSTRUCTION”
9. Tue 16:42 All clear: no source reports it any more
10. Wed 06:15 Motorway signs: “REPORT OF OBSTRUCTION” (reported again)
11. Wed 07:50 TomTom: queueing traffic, “Slow traffic”, delay ~4 min
12. Wed 08:03 Motorway signs: “REPORT OF OBSTRUCTION”
13. Wed 08:08 TomTom no longer reports it
14. Wed 08:16 Motorway signs no longer show “REPORT OF OBSTRUCTION”
15. Wed 09:46 Motorway signs: “REPORT OF OBSTRUCTION” (reported again)
16. Wed 09:46 Motorway signs no longer show “REPORT OF OBSTRUCTION”
17. Wed 10:46 Motorway signs: “REPORT OF OBSTRUCTION” (reported again)
18. Wed 10:46 Motorway signs no longer show “REPORT OF OBSTRUCTION”
19. Wed 11:17 Motorway signs: “REPORT OF OBSTRUCTION” (reported again)
20. Wed 11:17 Motorway signs no longer show “REPORT OF OBSTRUCTION”
21. Wed 11:47 Motorway signs no longer show “REPORT OF OBSTRUCTION”
22. Wed 11:47 All clear: no source reports it any more
23. 02:05 Motorway signs: “REPORT OF OBSTRUCTION” (reported again)
24. 07:28 Motorway signs: “COLLISION [HCA0]”
25. 08:07 Motorway signs no longer show “COLLISION [HCA0]”

What the sources said

• Overhead signs read “REPORT OF OBSTRUCTION” (2 signs; furthest along: M4 westbound within J4B).
• Slow traffic
• Overhead signs read “REPORT OF OBSTRUCTION” (1 sign; furthest along: M4 westbound within J4B).
• Overhead signs read “COLLISION [HCA0]” (1 sign; furthest along: M4 westbound between J4 and J4B).

Other recent incidents on the M4

• M4 reported crash J12–J11 eastbound · 06:27, cleared after 40 min
• M4 stopped traffic J3–J2 · yesterday 06:44, cleared after 3 h 26 min
• M4 reported crash J14–J15 westbound · Wed 14:02, cleared after 46 min
• M4 closed J13–J14 westbound · Tue 20:53, cleared after 7 h 12 min
• M4 closed J12–J13 westbound · Tue 20:53, cleared after 7 h 12 min
• M4 closed J16–J17 westbound · Tue 20:53, cleared after 7 h 12 min
• M4 closed J15–J16 westbound · Tue 20:53, cleared after 7 h 12 min
• M4 closed J20–J21 westbound · Tue 20:27, cleared after 7 h 37 min
• M4 crash J10–J11 westbound · Tue 17:21, cleared after 1 h 9 min
• M4 crash J7–J8 westbound · Tue 07:47, cleared after 2 h 11 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.