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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 Vehicle Fire
M4 eastbound between J20 and J19 | Eastbound | Vehicle Fire
Location : The M4 eastbound between junctions J20 and J19 . Reason : Vehicle fire. Status : Cleared.
📅 23 Feb 2026, 09:08 📍 Chipping Sodbury, Dursley
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M42
Severe Accident
M42 northbound within J2 | Northbound | Accident
Location : The M42 northbound at junction J2 . Reason : Road traffic collision. Status : Cleared.
📅 23 Feb 2026, 06:59 📍 Redditch, Bromsgrove
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M4 2 related
Severe Accident ↺ 30m
M4 eastbound between J6 and J5 | Eastbound | Accident
Location : The M4 eastbound between junctions J6 and J5 . Lane Closures : Lane four is closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to
📅 23 Feb 2026, 06:49 📍 Slough, Windsor
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Related segments — same incident

Severe Accident M4 eastbound between J6 and J5 | Eastbound | Accident Cleared 07:20 View →
M4
Severe Accident ↺ 2h 20m
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 : Accident involving a vehicle that has left the carriageway. Status : C
📅 22 Feb 2026, 16:30 📍 Swindon, Royal Wootton Bassett
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M4
Severe Accident ↺ 1h 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
📅 22 Feb 2026, 09:04 📍 Twyford, Woodley
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M40 2 related
Severe Accident ↺ 7h 0m
M40 J4 southbound access | Southbound | Accident
Location : The M40 southbound entry slip at junction J4 . Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 07:45 and 08:00 on 22 Fe
📅 21 Feb 2026, 20:59 📍 High Wycombe, Marlow
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Related segments — same incident

Severe Accident M40 southbound between J4 and J3 | Southbound | Accident Cleared 04:00 View →
M4
Severe Vehicle Fire ↺ 3h 31m
M4 westbound between J8 and J10 | Westbound | Vehicle Fire
Location : The M4 westbound between junctions J8 and J10 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Vehicle fire. Status : Currently Active. Time To Clear : The event is
📅 20 Feb 2026, 14:48 📍 Twyford, Woodley
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M4
Severe Accident ↺ 1h 2m
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
📅 20 Feb 2026, 13:32 📍 Iver, Staines
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M40
Severe Overturned Vehicle
M40 J2 southbound exit | Southbound | Overturned Vehicle
Location : The M40 southbound exit slip at junction J2 . Reason : Accident involving an overturned vehicle. Status : Cleared.
📅 20 Feb 2026, 12:54 📍 High Wycombe, Marlow
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M4
Severe Accident ↺ 52m
M4 westbound between J19 and J20 | Westbound | Accident
Location : The M4 westbound between junctions J19 and J20 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : Th
📅 20 Feb 2026, 10:57 📍 Chipping Sodbury, Dursley
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M40
Severe Vehicle Fire ↺ 56m
M40 northbound between J8A and J9 | Northbound | Vehicle Fire
Location : The M40 northbound between junctions J8A and J9 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Vehicle fire. Status : Currently Active. Time To Clear : The event i
📅 20 Feb 2026, 07:38 📍 Oxford, Abingdon
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M4 2 related
Severe Accident ↺ 31m
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 :
📅 19 Feb 2026, 07:08 📍 Iver, Staines
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Related segments — same incident

Severe Accident M4 westbound between J14 and J15 | Westbound | Accident Cleared 08:50 View →
M4
Severe Accident ↺ 3h 46m
M4 westbound between J7 and J8 | Westbound | Accident
Location : The M4 westbound between junctions J7 and J8 . Lane Closures : Lanes 1 and 2 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expect
📅 18 Feb 2026, 07:38 📍 Maidenhead, Burnham
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M40 2 related
Severe Accident ↺ 36m
M40 southbound within J15 | Southbound | Accident
Location : The M40 southbound between junctions J16 and J15 . Lane Closures : The hard shoulder, lanes 1 and 2 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clea
📅 17 Feb 2026, 07:23 📍 Leamington Spa, Kenilworth
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Related segments — same incident

Severe Accident M40 J15 southbound exit (before fast slip) | Southbound | Accident Cleared 07:30 View →
M48
Severe Accident
M48 eastbound between J1 and M4 | Eastbound | Accident
Location : The M48 eastbound between junction J1 and the M4 . Reason : Road traffic collision. Status : Cleared.
📅 17 Feb 2026, 05:49 📍 Lydney, Chipping Sodbury
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M4
Severe Accident ↺ 3h 35m
M4 westbound between J10 and J11 | Westbound | Accident
Location : The M4 westbound between junctions J10 and J11 . Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected to clear between 08:45 and 09:00 on 17
📅 17 Feb 2026, 03:54 📍 Reading, Theale
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M42
Severe Accident
M42 southbound between J11 and J10 | Southbound | Accident
Location : The M42 southbound between junctions J11 and J10 . Reason : Road traffic collision. Status : Cleared.
📅 16 Feb 2026, 14:16 📍 Tamworth, Atherstone
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M42
Severe Accident ↺ 30m
M42 southbound between J11 and J10 | Southbound | Accident
Location : The M42 southbound between junctions J11 and J10 . Lane Closures : Lane two is closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expected
📅 16 Feb 2026, 13:14 📍 Tamworth, Atherstone
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M4
Severe Accident ↺ 38m
M4 westbound between J12 and J13 | Westbound | Accident
Location : The M4 westbound between junctions J12 and J13 . Lane Closures : Lanes 2 and 3 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The event is expe
📅 16 Feb 2026, 09:21 📍 Thatcham, Theale
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M42
Severe Accident ↺ 1h 35m
link road from M42 J8 southbound to M6 J4A northbound | Southbound | Accident
Location : The M42 southbound exit slip at junction J8 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Road traffic collision. Status : Currently Active. Time To Clear : The ev
📅 16 Feb 2026, 07:19 📍 Coleshill, Atherstone
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M49
Severe Accident
M49 | Somerset | Carriageway Closure | Expect Delays
The M49 in Bristol / South Gloucestershire is closed southbound between the M4 J22 and the M5 J18 due to a collision.
📅 5 Mar 2025, 18:04 📍 Chipping Sodbury, Keynsham
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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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