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At a glance

🕐 Last verified 3 Mar, 00:40

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StatusCleared
Severity (NH)Severe
RoadM4
DirectionWestbound
RegionEastern
CountySlough
Category (NH)Accident
ReportedMon 2 Mar, 23:19
ClearedTue 3 Mar, 00:40
Lasted1h 20m
Road typeMotorway
Speed limit70 mph (variable)
Weather☀️ Clear sky
ReferenceREF-18905880

Times are UK time.

What National Highways say

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 expected to clear between 02:45 and 03:00 on 3 March 2026. Return To Normal : Normal traffic conditions are expected between 02:45 and 03:00 on 3 March 2026. Lanes Closed : There are two of four lanes closed.

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

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Recent M4 incidents

183 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 00:40 UK time on Tue 3 Mar. See the M4 right now.

What happened on the M4 on 2 Mar 2026?

Crash on the M4 westbound J5 to J6 in Slough, reported at 23:19 UK time on Mon 2 Mar. Cleared at 00:40 on Tue 3 Mar.

How long did it last?

1h 20m, from 23:19 UK time on Mon 2 Mar.

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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