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The M40 is closed southbound between Junction 1a (M25) and J1 (Denham) for emergency resurfacing. 
The M40 is closed northbound between Junction 1a (M25) and J1 (Denham) for emergency resurfacing. 
The M40 is closed northbound between Junction 1a (M25) and J1 (Denham) for emergency resurfacing. 
The M40 is closed southbound between Junction 1a (M25) and J1 (Denham) for emergency resurfacing. 
⏱ Still active — no changes from National Highways. Incident ongoing for 51 minutes. Monitoring continues.
The M40 is closed southbound between Junction 1a (M25) and J1 (Denham) for emergency resurfacing. 
⏱ Still active — no changes from National Highways. Incident ongoing for 1h 26m. Monitoring continues.
The M40 is closed southbound between Junction 1a (M25) and J1 (Denham) for emergency resurfacing. 
⏱ Still active — no changes from National Highways. Incident ongoing for 2h 1m. Monitoring continues.
The M40 is closed southbound between Junction 1a (M25) and J1 (Denham) for emergency resurfacing. 
⏱ Still active — no changes from National Highways. Incident ongoing for 2h 36m. Monitoring continues.
The M40 is closed southbound between Junction 1a (M25) and J1 (Denham) for emergency resurfacing. 
⏱ Still active — no changes from National Highways. Incident ongoing for 3h 11m. Monitoring continues.
The M40 is closed southbound between Junction 1a (M25) and J1 (Denham) for emergency resurfacing. 
⏱ Still active — no changes from National Highways. Incident ongoing for 3h 46m. Monitoring continues.
✅ Incident cleared — M40 reopened at 06:00 on 10 Jul 2026. Total disruption: 3h 46m. All lanes open, traffic returning to normal.
The M40 is closed southbound between Junction 1a (M25) and J1 (Denham) for emergency resurfacing. 
Wording as published by National Highways, recorded as it changed.
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