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M4 — UK Road Accident Archive

Motorway and A-road collisions from National Highways — free to search. Downloadable evidence reports are coming soon.

1
Today
20
This Week
1,249
Severe Total
1,249
Total Collisions
20 collisions logged in the last 7 days — could one have affected you?
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Downloadable evidence reports — coming soon
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115 incidents found on M4
M4
Severe Overturned Vehicle ↺ 1h 5m
M4 J8 westbound access | Westbound | Overturned Vehicle
Location : The M4 westbound entry slip at junction J8 . Reason : Accident involving an overturned vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 18:15 an
📅 4 Mar 2026, 16:49 📍 Maidenhead, Burnham
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M42
Severe Accident
M42 northbound between J5 and J5A | Northbound | Accident
Location : The M42 northbound between junctions J5 and J6 . Reason : Road traffic collision. Status : Cleared.
📅 4 Mar 2026, 15:46 📍 Knowle, Dorridge
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M4
Severe Accident ↺ 1h 20m
M4 westbound between J5 and J6 | Westbound | Accident
Location : The M4 westbound between junctions J5 and J6 . Lane Closures : Lanes 3 and 4 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expect
📅 2 Mar 2026, 23:19 📍 Slough, Windsor
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M4
Severe Accident ↺ 1h 2m
M4 westbound between J11 and J12 | Westbound | Accident
Location : The M4 westbound between junctions J11 and J12 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : Th
📅 2 Mar 2026, 08:52 📍 Theale, Reading
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M4
Severe Accident ↺ 2h 5m
M4 westbound between J8 and J10 | Westbound | Accident
Location : The M4 westbound between junctions J8 and J10 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The
📅 2 Mar 2026, 06:19 📍 Twyford, Woodley
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M4
Severe Vehicle Fire ↺ 1h 40m
M4 westbound at the Reading services slip road between J11 and J12 | Westbound | Vehicle Fire
Location : The M4 westbound exit slip at Reading Services. Reason : Vehicle fire. Status : Currently Active. Time To Clear : The event is expected to clear between 04:45 and 05:00 on 2 March 2026.
📅 2 Mar 2026, 03:15 📍 Theale, Reading
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M4
Severe Vehicle Fire ↺ 1h 8m
M4 westbound at the Reading services slip road between J11 and J12 | Westbound | Vehicle Fire
Location : The M4 westbound exit slip at Reading Services. Reason : Vehicle fire. Status : Currently Active. Time To Clear : The event is expected to clear between 02:30 and 02:45 on 2 March 2026.
📅 2 Mar 2026, 00:57 📍 Theale, Reading
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M4
Severe Accident ↺ 31m
M4 eastbound between J20 and J19 | Eastbound | Accident
Location : The M4 eastbound between junctions J20 and J19 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : Th
📅 28 Feb 2026, 12:34 📍 Chipping Sodbury, Dursley
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M40
Severe Accident ↺ 55m
M40 J1 southbound exit | Southbound | Accident
Location : The M40 southbound exit slip at junction J1 . Lane Closures : Lane one is closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to cl
📅 28 Feb 2026, 07:09 📍 High Wycombe, Beaconsfield
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M42
Severe Overturned Vehicle ↺ 2h 45m
M42 northbound between J1 and J2 | Northbound | Overturned Vehicle
Location : The M42 northbound between junctions M5 and J2 . Lane Closures : Lane three is closed. Reason : Accident involving an overturned vehicle. Status : Currently Active. Time To Clear : The
📅 28 Feb 2026, 01:44 📍 Redditch, Dorridge
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M4
Severe Accident ↺ 32m
M4 westbound between J16 and J17 | Westbound | Accident
Location : The M4 westbound between junctions J16 and J17 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : Th
📅 27 Feb 2026, 22:42 📍 Swindon, Royal Wootton Bassett
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M42
Severe Accident ↺ 31m
M42 southbound between J7 and J6 | Southbound | Accident
Location : The M42 southbound between junctions J7A and J6 . Lane Closures : Lane three is closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expecte
📅 27 Feb 2026, 16:48 📍 Coleshill, Knowle
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M4 2 related
Severe Accident ↺ 32m
M4 eastbound between J5 and J4B | Eastbound | Accident
Location : The M4 eastbound between junctions J5 and J4B . Lane Closures : The hard shoulder, lanes 1 and 2 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear :
📅 27 Feb 2026, 16:27 📍 Iver, Staines
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Related segments — same incident

Severe Accident M4 eastbound between J20 and J19 | Eastbound | Accident Cleared 16:35 View →
M4
Severe Accident ↺ 1h 53m
M4 westbound within J5 | Westbound | Accident
Location : The M4 westbound at junction J5 . Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 05:30 and 05:45 on 27 February 2026.
📅 27 Feb 2026, 02:12 📍 Iver, Slough
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M40 3 related
Severe Accident ↺ 3h 26m
fast slip from A404 northbound to M40 northbound | Northbound | Accident
Location : The M40 northbound. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 08:00 and 08:15 on 27 February 2026. Return To Nor
📅 27 Feb 2026, 00:28 📍 High Wycombe, Marlow
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Related segments — same incident

Severe Accident M40 J4 northbound access | Northbound | Accident Cleared 03:55 View → Severe Accident M40 northbound between J4 and J5 | Northbound | Accident Cleared 04:25 View →
M4
Severe Accident ↺ 1h 15m
M4 eastbound between J6 and J5 | Eastbound | Accident
Location : The M4 eastbound between junctions J6 and J5 . Lane Closures : Lanes 3 and 4 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expect
📅 26 Feb 2026, 14:39 📍 Slough, Windsor
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M4 2 related
Severe Accident
M4 eastbound between J6 and J5 | Eastbound | Accident
Location : The M4 eastbound between junctions J6 and J5 . Reason : Road traffic collision. Status : Cleared.
📅 26 Feb 2026, 10:02 📍 Slough, Windsor
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Related segments — same incident

Severe Accident M4 eastbound between J6 and J5 | Eastbound | Accident Cleared 11:00 View →
M4 2 related
Severe Accident ↺ 1h 6m
M4 eastbound between J8 and J7 | Eastbound | Accident
Location : The M4 eastbound between junctions J8 and J7 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The
📅 25 Feb 2026, 15:34 📍 Maidenhead, Burnham
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Related segments — same incident

Severe Accident M4 J8 eastbound access | Eastbound | Accident Cleared 16:40 View →
M42 2 related
Severe Accident ↺ 32m
M42 northbound between J8 and J9 | Northbound | Accident
Location : The M42 northbound between junctions J7A and J9 . Lane Closures : The hard shoulder, lanes 1, 2 and 3 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Cl
📅 25 Feb 2026, 15:17 📍 Atherstone, Coleshill
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Related segments — same incident

Severe Accident M42 southbound between J9 and J8 | Southbound | Accident Cleared 15:35 View →
M4
Severe Accident ↺ 30m
M4 eastbound between J5 and J4B | Eastbound | Accident
Location : The M4 eastbound between junctions J5 and J4B . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The
📅 25 Feb 2026, 07:49 📍 Iver, Staines
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M40
Severe Accident
M40 southbound between J13 and J12 | Southbound | Accident
Location : The M40 southbound between junctions J14 and J12 . Reason : Road traffic collision. Status : Cleared.
📅 25 Feb 2026, 07:14 📍 Banbury, Southam
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M42
Severe Accident
M42 northbound between J6 and J7 | Northbound | Accident
Location : The M42 northbound between junctions J6 and J8 . Reason : Road traffic collision. Status : Cleared.
📅 24 Feb 2026, 08:09 📍 Coleshill, Knowle
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M40
Severe Accident ↺ 1h 27m
M40 southbound within J9 | Southbound | Accident
Location : The M40 southbound at junction J9 . Lane Closures : Lane two is closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear betwee
📅 23 Feb 2026, 20:03 📍 Oxford, Kidlington
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M4
Severe Accident ↺ 1h 5m
M4 eastbound between J8 and J7 | Eastbound | Accident
Location : The M4 eastbound between junctions J8 and J7 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The
📅 23 Feb 2026, 12:19 📍 Maidenhead, Burnham
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UK Road Accident Data — National Highways

UK Traffic Updates archives every collision, overturned vehicle incident, and vehicle fire recorded by National Highways across England's motorway and strategic road network. Records include timestamps, road closures, duration, severity, and location data.

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