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The M4 westbound in Wiltshire is closed between J16 (near Swindon) and J17 (near Chippenham) following a serious collision that occurred approx. 02:06 on the 15.08.26
The M4 westbound in Wiltshire is closed between J16 (near Swindon) and J17 (near Chippenham) following a serious collision that occurred approx. 02:06 on the 15.08.26
The M4 westbound in Wiltshire is closed between J16 (near Swindon) and J17 (near Chippenham) following a serious collision that occurred approx. 02:06 on the 15.08.26
⏱ Still active — no changes from National Highways. Incident ongoing for 41 minutes. Monitoring continues.
The M4 westbound in Wiltshire is closed between J16 (near Swindon) and J17 (near Chippenham) following a serious collision that occurred approx. 02:06 on the 15.08.26
⏱ Still active — no changes from National Highways. Incident ongoing for 1h 16m. Monitoring continues.
The M4 westbound in Wiltshire is closed between J16 (near Swindon) and J17 (near Chippenham) following a serious collision that occurred approx. 02:06 on the 15.08.26
⏱ Still active — no changes from National Highways. Incident ongoing for 1h 51m. Monitoring continues.
The M4 westbound in Wiltshire is closed between J16 (near Swindon) and J17 (near Chippenham) following a serious collision that occurred approx. 02:06 on the 15.08.26
⏱ Still active — no changes from National Highways. Incident ongoing for 2h 26m. Monitoring continues.
The M4 westbound in Wiltshire is closed between J16 (near Swindon) and J17 (near Chippenham) following a serious collision that occurred approx. 02:06 on the 15.08.26
⏱ Still active — no changes from National Highways. Incident ongoing for 3h 1m. Monitoring continues.
The M4 westbound in Wiltshire is closed between J16 (near Swindon) and J17 (near Chippenham) following a serious collision that occurred approx. 02:06 on the 15.08.26
⏱ Still active — no changes from National Highways. Incident ongoing for 3h 36m. Monitoring continues.
The M4 westbound in Wiltshire is closed between J16 (near Swindon) and J17 (near Chippenham) following a serious collision that occurred approx. 02:06 on the 15.08.26
⏱ Still active — no changes from National Highways. Incident ongoing for 4h 11m. Monitoring continues.
The M4 westbound in Wiltshire is closed between J16 (near Swindon) and J17 (near Chippenham) following a serious collision that occurred approx. 02:06 on the 15.08.26
✅ Incident cleared — M4 reopened at 07:21 on 15 Aug 2026. Total disruption: 4h 21m. All lanes open, traffic returning to normal.
The M4 westbound in Wiltshire is closed between J16 (near Swindon) and J17 (near Chippenham) following a serious collision that occurred approx. 02:06 on the 15.08.26
Wording as published by National Highways, recorded as it changed.
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