A43 | Northamptonshire | Carriageway Closure | Expect Delays

Incident timeline

1. 06:28, 5 AugFirst report

   The A43 in Northamptonshire is closed southbound between the M1 J15a (Northampton) and the A5 (Towcester) due to a spillage.

2. 07:10, 5 AugUpdate

   The A43 in Northamptonshire is closed southbound between the M1 J15a (Northampton) and the A5 (Towcester) due to a spillage.

3. 07:45, 5 AugUpdate

   ⏱ Still active — no changes from National Highways. Incident ongoing for 1h 17m. Monitoring continues.

4. 07:50, 5 AugUpdate

   The A43 in Northamptonshire is closed southbound between the M1 J15a (Northampton) and the A5 (Towcester) due to a spillage.

5. 08:20, 5 AugUpdate

   ⏱ Still active — no changes from National Highways. Incident ongoing for 1h 52m. Monitoring continues.

6. 08:25, 5 AugUpdate

   The A43 in Northamptonshire is closed southbound between the M1 J15a (Northampton) and the A5 (Towcester) due to a spillage.

7. 08:55, 5 AugUpdate

   ⏱ Still active — no changes from National Highways. Incident ongoing for 2h 27m. Monitoring continues.

8. 09:00, 5 AugUpdate

   The A43 in Northamptonshire is closed southbound between the M1 J15a (Northampton) and the A5 (Towcester) due to a spillage.

9. 09:30, 5 AugUpdate

   ⏱ Still active — no changes from National Highways. Incident ongoing for 3h 2m. Monitoring continues.

10. 09:35, 5 AugUpdate

    The A43 in Northamptonshire is closed southbound between the M1 J15a (Northampton) and the A5 (Towcester) due to a spillage.

11. 10:05, 5 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 3h 37m. Monitoring continues.

12. 10:10, 5 AugUpdate

    The A43 in Northamptonshire is closed southbound between the M1 J15a (Northampton) and the A5 (Towcester) due to a spillage.

13. 10:40, 5 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 4h 12m. Monitoring continues.

14. 10:45, 5 AugUpdate

    The A43 in Northamptonshire is closed southbound between the M1 J15a (Northampton) and the A5 (Towcester) due to a spillage.

15. 11:15, 5 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 4h 47m. Monitoring continues.

16. 11:20, 5 AugUpdate

    The A43 in Northamptonshire is closed southbound between the M1 J15a (Northampton) and the A5 (Towcester) due to a spillage.

17. 11:50, 5 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 5h 22m. Monitoring continues.

18. 11:55, 5 AugUpdate

    The A43 in Northamptonshire is closed southbound between the M1 J15a (Northampton) and the A5 (Towcester) due to a spillage.

19. 12:25, 5 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 5h 57m. Monitoring continues.

20. 12:30, 5 AugUpdate

    The A43 in Northamptonshire is closed southbound between the M1 J15a (Northampton) and the A5 (Towcester) due to a spillage.

21. 13:00, 5 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 6h 32m. Monitoring continues.

22. 13:05, 5 AugUpdate

    The A43 in Northamptonshire is closed southbound between the M1 J15a (Northampton) and the A5 (Towcester) due to a spillage.

23. 13:35, 5 AugUpdate

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

24. 13:40, 5 AugUpdate

    The A43 in Northamptonshire is closed southbound between the M1 J15a (Northampton) and the A5 (Towcester) due to a spillage.

25. 14:10, 5 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 7h 42m. Monitoring continues.

26. 14:15, 5 AugUpdate

    The A43 in Northamptonshire is closed southbound between the M1 J15a (Northampton) and the A5 (Towcester) due to a spillage.

27. 14:45, 5 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 8h 17m. Monitoring continues.

28. 14:50, 5 AugUpdate

    The A43 in Northamptonshire is closed southbound between the M1 J15a (Northampton) and the A5 (Towcester) due to a spillage.

29. 15:20, 5 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 8h 52m. Monitoring continues.

30. 15:25, 5 AugUpdate

    The A43 in Northamptonshire is closed southbound between the M1 J15a (Northampton) and the A5 (Towcester) due to a spillage.

31. 16:00, 5 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 9h 32m. Monitoring continues.

32. 16:05, 5 AugUpdate

    The A43 in Northamptonshire is closed southbound between the M1 J15a (Northampton) and the A5 (Towcester) due to a spillage.

33. 16:25, 5 AugUpdate

    ✅ Incident cleared — A43 reopened at 16:25 on 5 Aug 2026. Total disruption: 9h 57m. All lanes open, traffic returning to normal.

34. 09:21, 6 NovFinal update

    The A43 in Northamptonshire is closed southbound between the M1 J15a (Northampton) and the A5 (Towcester) due to a spillage.

Wording from National Highways, recorded as it changed.

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