M4 Traffic

M4 15:54pm

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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:

HIGHWAYS MANAGEMENT
Location: The M4 westbound entry slip at junction J6 (Slough) .
Reason: Road Management.
Status: Currently Active.
Time to clear: The event is expected to clear between 13:45 and 14:00 on 25 Apr 2025.
Return to normal: Normal traffic conditions are expected between 13:45 and 14:00 on 25 Apr 2025.
Lanes closed: All lanes are closed.
Nearest town: 0.98m from Eton. CLEARED @ 12:36
ACCIDENT
Location: The M4 eastbound entry slip at junction J8 (High Wycombe) .
Lane closures: Lane one is closed.
Reason: Road traffic collision.
Status: Currently Active.
Time to clear: The event is expected to clear between 15:30 and 15:45 on 25 Apr 2025.
Return to normal: Normal traffic conditions are expected between 15:30 and 15:45 on 25 Apr 2025.
Lanes closed: There is one of two lanes closed.
Nearest town: 0.96m from Bray. CLEARED @ 14:51
J39 GROES TO J43 LLANDARCY
Description: M4WestboundJ39 Groes to J43 (Neath) LlandarcyCongestionDelay: s possible :,Start time: 25/04/2025 14:04 ,Expected end time:25/04/2025 20:04,Severity: Moderate,Source: Welsh Government,Last updated: 25/04/2025 14:04
Nearest town: 1.04m from Port Talbot. CLEARED @ 14:06
BROKEN DOWN VEHICLE
Location: The M4 westbound between junctions J19 (Bristol)and J20 (Bristol) .
Lane closures: The hard shoulder and lane 1 are closed.
Reason: Broken down vehicle.
Status: Currently Active.
Time to clear: The event is expected to clear between 14:45 and 15:00 on 25 Apr 2025.
Return to normal: Normal traffic conditions are expected between 14:45 and 15:00 on 25 Apr 2025.
Lanes closed: There is one of three lanes closed.
Nearest town: 3.76m from Alveston. CLEARED @ 14:05
J23A MAGOR TO J26 MALPAS
Description: M4WestboundJ23A (Magor) Magor to J26 (Newport) MalpasCongestion :,Start time: 25/04/2025 12:23 ,Expected end time:25/04/2025 18:23,Severity: Moderate,Source: Welsh Government,Last updated: 25/04/2025 12:23
Nearest town: 1.58m from Caerleon. CLEARED @ 12:30
CONGESTION
Location: The M4 westbound entry slip at junction J4 .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 15:45 and 16:00 on 25 Apr 2025.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 2.02m from Heathrow.
CONGESTION
Location: The M4 westbound between junctions J19 (Bristol)and J20 (Bristol) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 16:15 and 16:30 on 25 Apr 2025.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 5.18m from Bristol.
CONGESTION
Location: The M4 westbound at junction J19 (Bristol) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 15:15 and 15:30 on 25 Apr 2025.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 3.89m from Alveston. CLEARED @ 15:18
CONGESTION
Location: The M4 westbound entry slip at junction J22 (Avonmouth) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 14:45 and 15:00 on 25 Apr 2025.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 4.06m from Caldicot. CLEARED @ 14:51
CONGESTION
Location: The M4 westbound between junctions J19 (Bristol)and J20 (Bristol) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 14:15 and 14:30 on 25 Apr 2025.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 3.89m from Alveston. CLEARED @ 14:15
J38 MARGAM
Description: M4WestboundJ38 (Port Talbot) MargamResurfacing workRoad closedDiversions in place25/04/25-29/04/25 2000-0600 :,Start time: 25/04/2025 20:00 ,End Date:29/04/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 22/04/2025 12:23
Nearest town: 0.13m from Margam. CLEARED @ 12:42
C29 CAS-BACH I G26 MALPAS
Disgrifiad: M4Tuar DwyrainC29 Cas-bach i G26 MalpasTagfeyddOedin bosibl :,Amser y digwyddiad: 25/04/2025 12:25 ,Amser gorffen a ragwelir:25/04/2025 17:25,Difrifoldeb: Cymedrol,Ffynhonnell: Llywodraeth Cymru,Diweddarwyd ddiwethaf: 25/04/2025 12:25
Nearest town: 0.94m from Bassaleg. CLEARED @ 12:30
CONGESTION
Location: The M4 westbound between junctions J1 (London)and J2 (N.Circular) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 11:45 and 12:00 on 25 Apr 2025.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 0.63m from Chiswick. CLEARED @ 11:51


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.

ROAD WORKS
Location: The M4 westbound.
Reason: Roadworks are planned.
Status: Pending.
Schedule: From 21:00 on 12 May 2025 to 06:00 on 13 May 2025.
Lanes Closed: All lanes will be closed.
Nearest town: 4.96m from Hungerford.
ROAD WORKS
Location: The M4 westbound exit slip at junction J15 (Swindon) .
Lane closures: Lanes 1 and 2 will be closed.
Reason: Roadworks are planned.
Status: Pending.
Schedule: From 21:00 on 12 May 2025 to 06:00 on 13 May 2025.
Lanes Closed: All lanes will be closed.
Nearest town: 2.84m from Swindon.
ROAD WORKS
Location: The M4 westbound exit slip at Membury Services.
Reason: Roadworks are planned.
Status: Pending.
Schedule: From 21:00 on 12 May 2025 to 06:00 on 13 May 2025.
Lanes Closed: All lanes will be closed.
Nearest town: 4.64m from Hungerford.
ROAD WORKS
Location: The M4 westbound between junctions J14 (Hungerford)and J15 (Swindon) .
Reason: Roadworks are planned.
Status: Pending.
Schedule: From 21:00 on 12 May 2025 to 06:00 on 13 May 2025.
Lanes Closed: All lanes will be closed.
Nearest town: 2.86m from Hungerford.
ROAD WORKS
Location: The M4 westbound at junction J14 (Hungerford) .
Lane closures: Lanes 1,2 and 3 will be closed.
Reason: Roadworks are planned.
Status: Pending.
Schedule: From 21:00 on 12 May 2025 to 06:00 on 13 May 2025.
Lanes Closed: All lanes will be closed.
Nearest town: 2.95m from Hungerford.

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 entry slip at junction J6 (Slough) .

Due to: Road Management.



Time To Clear : The event is expected to clear between 13:45 and 14:00 on 25 April 2025.

Normal traffic conditions are expected between 13:45 and 14:00 on 25 April 2025.

Lanes Closed : All lanes are closed.
Nearest town: 0.98m from Eton.

51.5--0.62

Location: eastbound entry slip at junction J8 (High Wycombe) .

Lane Closures : Lane one is closed.

Due to: Road traffic collision.



Time To Clear : The event is expected to clear between 15:30 and 15:45 on 25 April 2025.

Normal traffic conditions are expected between 15:30 and 15:45 on 25 April 2025.

Lanes Closed : There is one of two lanes closed.
Nearest town: 0.96m from Bray.

51.5--0.72

Description: M4 : Westbound : J39 Groes to J43 (Neath) Llandarcy : Congestion : Delays possible :,Start time: 25/04/2025 14:04 ,Expected end time:25/04/2025 20:04,Severity: Moderate,Source: Welsh Government,Last updated: 25/04/2025 14:04
Nearest town: 1.04m from Port Talbot.

51.61--3.8

Location: westbound between junctions J19 (Bristol)and J20 (Bristol) .

Lane Closures : The hard shoulder and lane 1 are closed.

Due to: Broken down vehicle.



Time To Clear : The event is expected to clear between 14:45 and 15:00 on 25 April 2025.

Normal traffic conditions are expected between 14:45 and 15:00 on 25 April 2025.

Lanes Closed : There is one of three lanes closed.
Nearest town: 3.76m from Alveston.

51.53--2.54

Description: M4 : Westbound : J23A (Magor) Magor to J26 (Newport) Malpas : Congestion :,Start time: 25/04/2025 12:23 ,Expected end time:25/04/2025 18:23,Severity: Moderate,Source: Welsh Government,Last updated: 25/04/2025 12:23
Nearest town: 1.58m from Caerleon.

51.6--2.93

Location: westbound entry slip at junction J4 .

Due to: Congestion.



Normal traffic conditions are expected between 15:45 and 16:00 on 25 April 2025.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 2.02m from Heathrow.

51.5--0.46

Location: westbound between junctions J19 (Bristol)and J20 (Bristol) .

Due to: Congestion.



Normal traffic conditions are expected between 16:15 and 16:30 on 25 April 2025.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 5.18m from Bristol.

51.51--2.52

Location: westbound at junction J19 (Bristol) .

Due to: Congestion.



Normal traffic conditions are expected between 15:15 and 15:30 on 25 April 2025.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 3.89m from Alveston.

51.53--2.53

Location: westbound entry slip at junction J22 (Avonmouth) .

Due to: Congestion.



Normal traffic conditions are expected between 14:45 and 15:00 on 25 April 2025.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 4.06m from Caldicot.

51.57--2.66

Location: westbound between junctions J19 (Bristol)and J20 (Bristol) .

Due to: Congestion.



Normal traffic conditions are expected between 14:15 and 14:30 on 25 April 2025.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 3.89m from Alveston.

51.53--2.53

Description: M4 : Westbound : J38 (Port Talbot) Margam : Resurfacing work : Road closed : Diversions in place : 25/04/25-29/04/25 2000-0600 :,Start time: 25/04/2025 20:00 ,End Date:29/04/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 22/04/2025 12:23
Nearest town: 0.13m from Margam.

51.56--3.74

Disgrifiad: M4 : Tuar Dwyrain : C29 Cas-bach i G26 Malpas : Tagfeydd : Oedin bosibl :,Amser y digwyddiad: 25/04/2025 12:25 ,Amser gorffen a ragwelir:25/04/2025 17:25,Difrifoldeb: Cymedrol,Ffynhonnell: Llywodraeth Cymru,Diweddarwyd ddiwethaf: 25/04/2025 12:25
Nearest town: 0.94m from Bassaleg.

51.57--3.03

Location: westbound between junctions J1 (London)and J2 (N.Circular) .

Due to: Congestion.



Normal traffic conditions are expected between 11:45 and 12:00 on 25 April 2025.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 0.63m from Chiswick.

51.49--0.28

Location: westbound.

Due to: Roadworks are planned.

Status : Pending.

Schedule : From 21:00 on 12 May 2025 to 06:00 on 13 May 2025.

Lanes Closed : All lanes will be closed.
Nearest town: 4.96m from Hungerford.

51.48--1.56

Location: westbound exit slip at junction J15 (Swindon) .

Lane Closures : Lanes 1 and 2 will be closed.

Due to: Roadworks are planned.

Status : Pending.

Schedule : From 21:00 on 12 May 2025 to 06:00 on 13 May 2025.

Lanes Closed : All lanes will be closed.
Nearest town: 2.84m from Swindon.

51.53--1.72

Location: westbound exit slip at Membury Services.

Due to: Roadworks are planned.

Status : Pending.

Schedule : From 21:00 on 12 May 2025 to 06:00 on 13 May 2025.

Lanes Closed : All lanes will be closed.
Nearest town: 4.64m from Hungerford.

51.48--1.55

Location: westbound between junctions J14 (Hungerford)and J15 (Swindon) .

Due to: Roadworks are planned.

Status : Pending.

Schedule : From 21:00 on 12 May 2025 to 06:00 on 13 May 2025.

Lanes Closed : All lanes will be closed.
Nearest town: 2.86m from Hungerford.

51.45--1.48

Location: westbound at junction J14 (Hungerford) .

Lane Closures : Lanes 1,2 and 3 will be closed.

Due to: Roadworks are planned.

Status : Pending.

Schedule : From 21:00 on 12 May 2025 to 06:00 on 13 May 2025.

Lanes Closed : All lanes will be closed.
Nearest town: 2.95m from Hungerford.

51.45--1.48