The M4 in South Gloucestershire is closed in both directions between J20 (M5, Almondsbury Interchange) and J22 (Prince of Wales Bridge), due to a Avon & Somerset Police led incident. 

RoadM4
SeveritySevere
StatusCleared
DirectionWestbound
Started22:45, 2 Sep 2026
Cleared00:46, 3 Sep 2026
Incident timeline
First report
The M4 in South Gloucestershire is closed in both directions between J20 (M5, Almondsbury Interchange) and J22 (Prince of Wales Bridge), due to a Avon & Somerset Police led incident. 

Update
The M4 in South Gloucestershire is closed in both directions between J20 (M5, Almondsbury Interchange) and J22 (Prince of Wales Bridge), due to a Avon & Somerset Police led incident. 

Update
⏱ Still active — no changes from National Highways. Incident ongoing for 46 minutes. Monitoring continues.
Update
The M4 in South Gloucestershire is closed in both directions between J20 (M5, Almondsbury Interchange) and J22 (Prince of Wales Bridge), due to a Avon & Somerset Police led incident. 

Update
⏱ Still active — no changes from National Highways. Incident ongoing for 1h 21m. Monitoring continues.
Update
The M4 in South Gloucestershire is closed in both directions between J20 (M5, Almondsbury Interchange) and J22 (Prince of Wales Bridge), due to a Avon & Somerset Police led incident. 

Update
⏱ Still active — no changes from National Highways. Incident ongoing for 1h 56m. Monitoring continues.
Update
The M4 in South Gloucestershire is closed in both directions between J20 (M5, Almondsbury Interchange) and J22 (Prince of Wales Bridge), due to a Avon & Somerset Police led incident. 

Update
✅ Incident cleared — M4 reopened at 00:46 on 3 Sep 2026. Total disruption: 2h 1m. All lanes open, traffic returning to normal.
Final update
The M4 in South Gloucestershire is closed in both directions between J20 (M5, Almondsbury Interchange) and J22 (Prince of Wales Bridge), due to a Avon & Somerset Police led incident. 

Wording from National Highways, recorded as it changed.
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