M4 | Wiltshire | Carriageway Closure | Expect Delays

Incident timeline

1. 09:35, 6 AugFirst report

   The M4 in Wiltshire is closed in eastbound between J15 (Swindon) and J14 (Hungerford) due to a collision

2. 10:15, 6 AugUpdate

   The M4 in Wiltshire is closed in eastbound between J15 (Swindon) and J14 (Hungerford) due to a collision

3. 10:50, 6 AugUpdate

   ⏱ Still active — no changes from National Highways. Incident ongoing for 1h 15m. Monitoring continues.

4. 10:55, 6 AugUpdate

   The M4 in Wiltshire is closed in eastbound between J15 (Swindon) and J14 (Hungerford) due to a collision

5. 11:25, 6 AugUpdate

   ⏱ Still active — no changes from National Highways. Incident ongoing for 1h 50m. Monitoring continues.

6. 11:30, 6 AugUpdate

   The M4 in Wiltshire is closed in eastbound between J15 (Swindon) and J14 (Hungerford) due to a collision

7. 12:00, 6 AugUpdate

   ⏱ Still active — no changes from National Highways. Incident ongoing for 2h 25m. Monitoring continues.

8. 12:05, 6 AugUpdate

   The M4 in Wiltshire is closed in eastbound between J15 (Swindon) and J14 (Hungerford) due to a collision

9. 12:35, 6 AugUpdate

   ⏱ Still active — no changes from National Highways. Incident ongoing for 3h 0m. Monitoring continues.

10. 12:40, 6 AugUpdate

    The M4 in Wiltshire is closed in eastbound between J15 (Swindon) and J14 (Hungerford) due to a collision

11. 13:10, 6 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 3h 35m. Monitoring continues.

12. 13:15, 6 AugUpdate

    The M4 in Wiltshire is closed in eastbound between J15 (Swindon) and J14 (Hungerford) due to a collision

13. 13:45, 6 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 4h 10m. Monitoring continues.

14. 13:50, 6 AugUpdate

    The M4 in Wiltshire is closed in eastbound between J15 (Swindon) and J14 (Hungerford) due to a collision

15. 14:20, 6 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 4h 45m. Monitoring continues.

16. 14:25, 6 AugUpdate

    The M4 in Wiltshire is closed in eastbound between J15 (Swindon) and J14 (Hungerford) due to a collision

17. 14:55, 6 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 5h 20m. Monitoring continues.

18. 15:00, 6 AugUpdate

    The M4 in Wiltshire is closed in eastbound between J15 (Swindon) and J14 (Hungerford) due to a collision

19. 15:30, 6 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 5h 55m. Monitoring continues.

20. 15:35, 6 AugUpdate

    The M4 in Wiltshire is closed in eastbound between J15 (Swindon) and J14 (Hungerford) due to a collision

21. 16:05, 6 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 6h 30m. Monitoring continues.

22. 16:10, 6 AugUpdate

    The M4 in Wiltshire is closed in eastbound between J15 (Swindon) and J14 (Hungerford) due to a collision

23. 16:45, 6 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 7h 10m. Monitoring continues.

24. 16:50, 6 AugUpdate

    The M4 in Wiltshire is closed in eastbound between J15 (Swindon) and J14 (Hungerford) due to a collision

25. 17:20, 6 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 7h 45m. Monitoring continues.

26. 17:25, 6 AugUpdate

    The M4 in Wiltshire is closed in eastbound between J15 (Swindon) and J14 (Hungerford) due to a collision

27. 17:55, 6 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 8h 20m. Monitoring continues.

28. 18:00, 6 AugUpdate

    The M4 in Wiltshire is closed in eastbound between J15 (Swindon) and J14 (Hungerford) due to a collision

29. 18:30, 6 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 8h 55m. Monitoring continues.

30. 18:35, 6 AugUpdate

    The M4 in Wiltshire is closed in eastbound between J15 (Swindon) and J14 (Hungerford) due to a collision

31. 19:05, 6 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 9h 30m. Monitoring continues.

32. 19:10, 6 AugUpdate

    The M4 in Wiltshire is closed in eastbound between J15 (Swindon) and J14 (Hungerford) due to a collision

33. 19:35, 6 AugUpdate

    ✅ Incident cleared — M4 reopened at 19:35 on 6 Aug 2026. Total disruption: 10h . All lanes open, traffic returning to normal.

34. 06:43, 6 NovFinal update

    The M4 in Wiltshire is closed in eastbound between J15 (Swindon) and J14 (Hungerford) due to a collision

Wording from National Highways, recorded as it changed.

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