M4 | Wiltshire | Carriageway Closure | Expect Delays

Incident timeline

1. 12:59, 3 AugFirst report

   The M4 in Wiltshire is closed westbound between J15 (Coate) and J16 (near Swindon) due to an HGV fire. The HGV is carrying bales of hay.

2. 13:40, 3 AugUpdate

   The M4 in Wiltshire is closed westbound between J15 (Coate) and J16 (near Swindon) due to an HGV fire. The HGV is carrying bales of hay.

3. 14:10, 3 AugUpdate

   ⏱ Still active — no changes from National Highways. Incident ongoing for 1h 11m. Monitoring continues.

4. 14:15, 3 AugUpdate

   The M4 in Wiltshire is closed westbound between J15 (Coate) and J16 (near Swindon) due to an HGV fire. The HGV is carrying bales of hay.

5. 14:45, 3 AugUpdate

   ⏱ Still active — no changes from National Highways. Incident ongoing for 1h 46m. Monitoring continues.

6. 14:50, 3 AugUpdate

   The M4 in Wiltshire is closed westbound between J15 (Coate) and J16 (near Swindon) due to an HGV fire. The HGV is carrying bales of hay.

7. 15:25, 3 AugUpdate

   ⏱ Still active — no changes from National Highways. Incident ongoing for 2h 26m. Monitoring continues.

8. 15:30, 3 AugUpdate

   The M4 in Wiltshire is closed westbound between J15 (Coate) and J16 (near Swindon) due to an HGV fire. The HGV is carrying bales of hay.

9. 16:05, 3 AugUpdate

   ⏱ Still active — no changes from National Highways. Incident ongoing for 3h 6m. Monitoring continues.

10. 16:10, 3 AugUpdate

    The M4 in Wiltshire is closed westbound between J15 (Coate) and J16 (near Swindon) due to an HGV fire. The HGV is carrying bales of hay.

11. 16:45, 3 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 3h 46m. Monitoring continues.

12. 16:50, 3 AugUpdate

    The M4 in Wiltshire is closed westbound between J15 (Coate) and J16 (near Swindon) due to an HGV fire. The HGV is carrying bales of hay.

13. 17:20, 3 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 4h 21m. Monitoring continues.

14. 17:25, 3 AugUpdate

    The M4 in Wiltshire is closed westbound between J15 (Coate) and J16 (near Swindon) due to an HGV fire. The HGV is carrying bales of hay.

15. 17:55, 3 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 4h 56m. Monitoring continues.

16. 18:00, 3 AugUpdate

    The M4 in Wiltshire is closed westbound between J15 (Coate) and J16 (near Swindon) due to an HGV fire. The HGV is carrying bales of hay.

17. 18:30, 3 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 5h 31m. Monitoring continues.

18. 18:35, 3 AugUpdate

    The M4 in Wiltshire is closed westbound between J15 (Coate) and J16 (near Swindon) due to an HGV fire. The HGV is carrying bales of hay.

19. 19:05, 3 AugUpdate

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

20. 19:10, 3 AugUpdate

    The M4 in Wiltshire is closed westbound between J15 (Coate) and J16 (near Swindon) due to an HGV fire. The HGV is carrying bales of hay.

21. 19:40, 3 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 6h 41m. Monitoring continues.

22. 19:45, 3 AugUpdate

    The M4 in Wiltshire is closed westbound between J15 (Coate) and J16 (near Swindon) due to an HGV fire. The HGV is carrying bales of hay.

23. 20:15, 3 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 7h 16m. Monitoring continues.

24. 20:20, 3 AugUpdate

    The M4 in Wiltshire is closed westbound between J15 (Coate) and J16 (near Swindon) due to an HGV fire. The HGV is carrying bales of hay.

25. 20:50, 3 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 7h 51m. Monitoring continues.

26. 20:55, 3 AugUpdate

    The M4 in Wiltshire is closed westbound between J15 (Coate) and J16 (near Swindon) due to an HGV fire. The HGV is carrying bales of hay.

27. 21:25, 3 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 8h 26m. Monitoring continues.

28. 21:30, 3 AugUpdate

    The M4 in Wiltshire is closed westbound between J15 (Coate) and J16 (near Swindon) due to an HGV fire. The HGV is carrying bales of hay.

29. 22:00, 3 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 9h 1m. Monitoring continues.

30. 22:05, 3 AugUpdate

    The M4 in Wiltshire is closed westbound between J15 (Coate) and J16 (near Swindon) due to an HGV fire. The HGV is carrying bales of hay.

31. 22:35, 3 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 9h 36m. Monitoring continues.

32. 22:40, 3 AugUpdate

    The M4 in Wiltshire is closed westbound between J15 (Coate) and J16 (near Swindon) due to an HGV fire. The HGV is carrying bales of hay.

33. 23:10, 3 AugUpdate

    ⏱ Still active — no changes from National Highways. Incident ongoing for 10h 11m. Monitoring continues.

34. 23:15, 3 AugUpdate

    The M4 in Wiltshire is closed westbound between J15 (Coate) and J16 (near Swindon) due to an HGV fire. The HGV is carrying bales of hay.

35. 23:30, 3 AugUpdate

    ✅ Incident cleared — M4 reopened at 23:30 on 3 Aug 2026. Total disruption: 10h 31m. All lanes open, traffic returning to normal.

36. 10:24, 6 NovFinal update

    The M4 in Wiltshire is closed westbound between J15 (Coate) and J16 (near Swindon) due to an HGV fire. The HGV is carrying bales of hay.

Wording from National Highways, recorded as it changed.

More on the M4

• M4M4 - IncidentMinor · 35m ago
• M4M4 - IncidentMinor · 35m ago
• M4M4 - IncidentMinor · 1h ago
• M4M4 - IncidentSevere · 3h ago
• M4M4 - IncidentModerate · 3h ago