M4 Traffic

M4 07:44am

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FULL SCREENUPDATED: 07:44
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Traffic incidents

The following traffic incidents and congestion for M4 have been reported by Highways England, Traffic Scotland, Traffic Wales or Transport for London (TfL) in the last two hours:

ACCIDENT
Location: The M4 westbound between junctions J5 (Colnbrook)and J6 (Slough) .
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 08:30 and 08:45 on 20 Mar 2026.
Return to normal: Normal traffic conditions are expected between 09:15 and 09:30 on 20 Mar 2026.
Delay: There are currently delays of 20 minutes against expected traffic.
Lanes closed: There are two of four lanes closed.
Nearest town: 0.16m from Eton.
CONGESTION
Location: The M4 westbound between junctions J5 (Colnbrook)and J6 (Slough) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 07:45 and 08:00 on 20 Mar 2026.
CauseRoad traffic collision.
Delay: There are currently delays of 20 minutes against expected traffic.
Nearest town: 1.62m from Slough.
WESTBOUND
Description: M4Now clearWestboundJ24 (Newport) Coldra,Start time: 20/03/2026 0:38 ,Expected end time:20/03/2026 0:43,Severity: Road closure,Source: Welsh Government,Last updated: 20/03/2026 0:38
Nearest town: 1.85m from Caerleon. CLEARED @ 01:54


There are no current incidents in this location.

M4 Roadworks

The following roadworks have been reported by various highways agencies and official transport sources.Click on a roadworks item to view more details on the traffic map.

M4

The M4 is a motorway in the United Kingdom that connects London and South West England. It runs from London to South Wales and it is a crucial part of the English transport network.

The M4 was first proposed in 1927 and construction began in 1958. It was completed in 1971, running from London to Reading, Berkshire and later extending to South Wales.

The M4 is one of the major roads in the UK and a significant part of the economy. The M4 has been upgraded in certain sections and currently consists of 146 miles (235 km) of motorway.

The M4 is one of the safest motorways in the UK. According to the Department of Transport (DfT), the M4 had a collision rate of just 0.41 per million vehicle kilometres between 2017-2018. This is lower than the UK major-road average of 0.71.

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LEGAL NOTICE

Please remember that it is against the law to use your mobile phone, tablet or any electronic device without a hands-free kit whilst driving.If you're caught by the police using any device that can send or receive data whilst driving or riding a motorcyle you'll get an automatic fixed penalty notice, 6 points on your licence and a fine of £200.A court could also disqualify you from driving.

Elsewhere on the web:

National Highways TrafficNational Highways England

Official source of traffic updates.

Transport for LondonTransport for London (TFL)

Transport for London's (TfL) portal for transportation in London.

Traffic WalesTraffic Wales

The Welsh government's traffic information service for Wales.

Traffic ScotlandTraffic Scotland

Live traffic conditions and news for Scotland's road network.

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Location: westbound between junctions J5 (Colnbrook)and J6 (Slough) .

Lane Closures : Lanes 3 and 4 are closed.

Due to: Road traffic collision.



Time To Clear : The event is expected to clear between 08:30 and 08:45 on 20 March 2026.

Normal traffic conditions are expected between 09:15 and 09:30 on 20 March 2026.

Delay : There are currently delays of 20 minutes against expected traffic.

Lanes Closed : There are two of four lanes closed.
Nearest town: 0.16m from Eton.

51.5--0.6

Location: westbound between junctions J5 (Colnbrook)and J6 (Slough) .

Due to: Congestion.



Normal traffic conditions are expected between 07:45 and 08:00 on 20 March 2026.

Cause : Road traffic collision.

Delay : There are currently delays of 20 minutes against expected traffic.
Nearest town: 1.62m from Slough.

51.49--0.55

Description: M4 : Now clear : Westbound : J24 (Newport) Coldra,Start time: 20/03/2026 0:38 ,Expected end time:20/03/2026 0:43,Severity: Road closure,Source: Welsh Government,Last updated: 20/03/2026 0:38
Nearest town: 1.85m from Caerleon.

51.6--2.92