M4 | Berkshire | Carriageway Closure | Long Delays 30 minutes

Incident timeline

1. 21:42, 9 SepFirst report

   The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

2. 22:11, 9 SepUpdate

   The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

3. 22:41, 9 SepUpdate

   ⏱ Still active — no changes from National Highways. Incident ongoing for 59 minutes. Monitoring continues.

4. 22:46, 9 SepUpdate

   The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

5. 23:16, 9 SepUpdate

   ⏱ Still active — no changes from National Highways. Incident ongoing for 1h 34m. Monitoring continues.

6. 23:21, 9 SepUpdate

   The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

7. 23:51, 9 SepUpdate

   ⏱ Still active — no changes from National Highways. Incident ongoing for 2h 9m. Monitoring continues.

8. 23:56, 9 SepUpdate

   The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

9. 00:26, 10 SepUpdate

   ⏱ Still active — no changes from National Highways. Incident ongoing for 2h 44m. Monitoring continues.

10. 00:31, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

11. 01:01, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 3h 19m. Monitoring continues.

12. 01:06, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

13. 01:36, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 3h 54m. Monitoring continues.

14. 01:41, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

15. 02:11, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 4h 29m. Monitoring continues.

16. 02:16, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

17. 02:51, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 5h 9m. Monitoring continues.

18. 02:56, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

19. 03:26, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 5h 44m. Monitoring continues.

20. 03:31, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

21. 04:01, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 6h 19m. Monitoring continues.

22. 04:06, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

23. 04:36, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 6h 54m. Monitoring continues.

24. 04:41, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

25. 05:11, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 7h 29m. Monitoring continues.

26. 05:16, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

27. 05:46, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 8h 4m. Monitoring continues.

28. 05:51, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

29. 06:21, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 8h 39m. Monitoring continues.

30. 06:26, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

31. 06:56, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 9h 14m. Monitoring continues.

32. 07:01, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

33. 07:31, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 9h 49m. Monitoring continues.

34. 07:36, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

35. 08:06, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 10h 24m. Monitoring continues.

36. 08:11, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

37. 08:41, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 10h 59m. Monitoring continues.

38. 08:46, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

39. 09:16, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 11h 34m. Delays of 30 minutes still recorded. Monitoring continues.

40. 09:21, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

41. 09:51, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 12h 9m. Delays of 30 minutes still recorded. Monitoring continues.

42. 09:56, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

43. 10:26, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 12h 44m. Delays of 30 minutes still recorded. Monitoring continues.

44. 10:31, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

45. 11:06, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 13h 24m. Delays of 30 minutes still recorded. Monitoring continues.

46. 11:11, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

47. 11:41, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 13h 59m. Delays of 30 minutes still recorded. Monitoring continues.

48. 11:46, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

49. 12:16, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 14h 34m. Delays of 30 minutes still recorded. Monitoring continues.

50. 12:21, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

51. 12:51, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 15h 9m. Delays of 30 minutes still recorded. Monitoring continues.

52. 12:56, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

53. 13:31, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 15h 49m. Delays of 30 minutes still recorded. Monitoring continues.

54. 13:36, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

55. 14:06, 10 SepUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 16h 24m. Delays of 30 minutes still recorded. Monitoring continues.

56. 14:11, 10 SepUpdate

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

57. 14:21, 10 SepUpdate

    ✅ Incident cleared — M4 reopened at 14:21 on 10 Sep 2026. Total disruption: 16h 39m. All lanes open, traffic returning to normal.

58. 12:35, 6 NovFinal update

    The M4 in Berkshire is closed in both directions between J8/9 (Maidenhead) and J10 (Reading) due to a collisiont

Wording from National Highways, recorded as it changed.

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