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At a glance

🕐 Last verified 15 Aug, 06:36

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StatusCleared
Severity (NH)Severe
RoadM4
DirectionWestbound
RegionWiltshire
ReportedSat 15 Aug, 02:59
Cleared07:21
Lasted4h 21m
Road typeMotorway
Speed limit70 mph (variable)
Weather☁️ Overcast
ReferenceREF-26215420
Views193

Times are UK time.

What National Highways say

M4 | Wiltshire | Carriageway Closure | Expect Delays

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 official National Highways record of this incident, kept here after the road reopens.

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17 updates captured · Cleared

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M4  · Westbound J16 to J17 ✓ CLEARED

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Also on the M4 today

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Recent M4 incidents

182 incidents and roadworks logged on the M4 in the last 30 days, 56 of them serious or severe. Times are UK time.

M4 | Berkshire | Carriageway Closure | DelaysWed 9 Sep, 21:42 M4 | Berkshire | Carriageway Closure | Long Delays 30 minutesWed 9 Sep, 21:42 M4 | Greater London | Carriageway ClosureWed 9 Sep, 01:27 M4 | Gloucestershire | Road Closure | Expect DelaysWed 2 Sep, 22:45 M4 | Wiltshire | Carriageway Closure | Expect DelaysThu 6 Aug, 09:35 M4 | Wiltshire | Carriageway Closure | Expect DelaysMon 3 Aug, 12:59
Every M4 incident

Common questions

Is the M4 closed?

Not because of this crash. It cleared at 07:21 UK time on Sat 15 Aug. See the M4 right now.

What happened on the M4 on 15 Aug 2026?

Crash on the M4 westbound in Wiltshire, reported at 02:59 UK time on Sat 15 Aug. Cleared at 07:21.

How long did it last?

4h 21m, from 02:59 UK time on Sat 15 Aug.

Where can I see everything else on the M4?

The M4 live page shows what is happening now, and the M4 archive has every incident on record.

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