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At a glance

🕐 Last verified 19 Jul, 09:10

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StatusCleared
Severity (NH)Severe
RoadM4
DirectionWestbound
RegionWiltshire
ReportedSat 18 Jul, 20:49
ClearedSun 19 Jul, 09:55
Lasted13h 5m
Road typeMotorway
Speed limit70 mph (variable)
Weather☀️ Clear sky
ReferenceREF-26203854
Views165

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. 20:05 on the 18.07.26

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

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Live Incident Timeline

42 updates captured · 2 affected segments · Cleared

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M4  · Westbound J16 to J17 ✓ CLEARED
M4  · Both Dir. J16 to J17 ✓ CLEARED

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✓ Full timestamped update timeline
✓ Green-highlighted changes each update
✓ All 2 affected segments tracked
✓ Expected clear time per segment
✓ Weather & road surface at incident
✓ Emergency services confirmed
✓ Insurance claim checklist
✓ 3 ready-to-use template letters

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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 DelaysSat 15 Aug, 02:59 M4 | Wiltshire | Carriageway Closure | Expect DelaysThu 6 Aug, 09:35
Every M4 incident

Common questions

Is the M4 closed?

Not because of this crash. It cleared at 09:55 UK time on Sun 19 Jul. See the M4 right now.

What happened on the M4 on 18 Jul 2026?

Crash on the M4 westbound in Wiltshire, reported at 20:49 UK time on Sat 18 Jul. Cleared at 09:55 on Sun 19 Jul.

How long did it last?

13h 5m, from 20:49 UK time on Sat 18 Jul.

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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