M4 Traffic

M4 02:04am

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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:

J33 CAPEL LLANILLTERN
Description: M4EastboundJ33 (Cardiff) Capel LlanillternOverbridgeCarriageway maintenanceClosed02/03/26-05/03/26 2000-0600 :,Start time: 02/03/2026 20:00 ,End Date:05/03/2026 6:00,Severity: Moderate,Source: Welsh Government, Last updated: 23/02/2026 14:37
Nearest town: 1.63m from Pentyrch. CLEARED @ 00:42
ACCIDENT
Location: The M4 westbound between junctions J16 (Swindon)and J17 (Chippenham) .
Lane closures: The hard shoulder and lane 1 are closed.
Reason: Road traffic collision.
Status: Currently Active.
Time to clear: The event is expected to clear between 00:15 and 00:30 on 28 Feb 2026.
Return to normal: Normal traffic conditions are expected between 00:15 and 00:30 on 28 Feb 2026.
Lanes closed: There is one of three lanes closed.
Nearest town: 1.67m from Wootton Bassett. CLEARED @ 23:14
WESTBOUND
Description: M4Now clearWestboundJ23A (Magor) Magor to J26 (Newport) Malpas,Start time: 27/02/2026 19:11 ,Expected end time:27/02/2026 19:16,Severity: Moderate,Source: Welsh Government,Last updated: 27/02/2026 19:11
Nearest town: 1.58m from Caerleon. CLEARED @ 20:30
CONGESTION
Location: The M4 eastbound entry slip at junction J8 (High Wycombe) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 21:30 and 21:45 on 27 Feb 2026.
Nearest town: 0.89m from Bray. CLEARED @ 21:35
CONGESTION
Location: The M4 eastbound between junctions J20 (Bristol)and J19 (Bristol) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 21:15 and 21:30 on 27 Feb 2026.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 3.88m from Alveston. CLEARED @ 21:26


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 6 Mar 2026 to 06:00 on 7 Mar 2026.
Lanes Closed: All lanes will be closed.
Nearest town: 4.96m from Hungerford.
ROAD WORKS
Location: The M4 eastbound between junctions J20 (Bristol)and J19 (Bristol) .
Lane closures: Lanes 2 and 3 will be closed.
Reason: Roadworks are planned.
Status: Pending.
Schedule: From 20:00 on 6 Mar 2026 to 06:00 on 7 Mar 2026.
Lanes Closed: There will be two of three lanes closed.
Nearest town: 3.93m from Alveston.
ROAD WORKS
Location: The M4 westbound between junctions J14 (Hungerford)and J15 (Swindon) .
Reason: Roadworks scheme is planned.
Status: Pending.
Schedule: From 21:00 on 6 Mar 2026 to 06:00 on 7 Mar 2026.
Nearest town: 2.86m 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 6 Mar 2026 to 06:00 on 7 Mar 2026.
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 6 Mar 2026 to 06:00 on 7 Mar 2026.
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 6 Mar 2026 to 06:00 on 7 Mar 2026.
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 6 Mar 2026 to 06:00 on 7 Mar 2026.
Lanes Closed: All lanes will be closed.
Nearest town: 2.95m from Hungerford.
ROAD WORKS
Location: The M4 westbound between junctions J19 (Bristol)and J20 (Bristol) .
Lane closures: Lanes 2 and 3 will be closed.
Reason: Roadworks are planned.
Status: Pending.
Schedule: From 20:00 on 6 Mar 2026 to 06:00 on 7 Mar 2026.
Lanes Closed: There will be two of three lanes closed.
Nearest town: 5.13m from Bristol.

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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Description: M4 : Eastbound : J33 (Cardiff) Capel Llanilltern : Overbridge : Carriageway maintenance : Closed : 02/03/26-05/03/26 2000-0600 :,Start time: 02/03/2026 20:00 ,End Date:05/03/2026 6:00,Severity: Moderate,Source: Welsh Government, Last updated: 23/02/2026 14:37
Nearest town: 1.63m from Pentyrch.

51.51--3.31

Location: westbound between junctions J16 (Swindon)and J17 (Chippenham) .

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

Due to: Road traffic collision.



Time To Clear : The event is expected to clear between 00:15 and 00:30 on 28 February 2026.

Normal traffic conditions are expected between 00:15 and 00:30 on 28 February 2026.

Lanes Closed : There is one of three lanes closed.
Nearest town: 1.67m from Wootton Bassett.

51.56--1.89

Description: M4 : Now clear : Westbound : J23A (Magor) Magor to J26 (Newport) Malpas,Start time: 27/02/2026 19:11 ,Expected end time:27/02/2026 19:16,Severity: Moderate,Source: Welsh Government,Last updated: 27/02/2026 19:11
Nearest town: 1.58m from Caerleon.

51.6--2.93

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

Due to: Congestion.



Normal traffic conditions are expected between 21:30 and 21:45 on 27 February 2026.
Nearest town: 0.89m from Bray.

51.5--0.72

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

Due to: Congestion.



Normal traffic conditions are expected between 21:15 and 21:30 on 27 February 2026.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 3.88m from Alveston.

51.53--2.53

Location: westbound.

Due to: Roadworks are planned.

Status : Pending.

Schedule : From 21:00 on 6 March 2026 to 06:00 on 7 March 2026.

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

51.48--1.56

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

Lane Closures : Lanes 2 and 3 will be closed.

Due to: Roadworks are planned.

Status : Pending.

Schedule : From 20:00 on 6 March 2026 to 06:00 on 7 March 2026.

Lanes Closed : There will be two of three lanes closed.
Nearest town: 3.93m from Alveston.

51.53--2.53

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

Due to: Roadworks scheme is planned.

Status : Pending.

Schedule : From 21:00 on 6 March 2026 to 06:00 on 7 March 2026.
Nearest town: 2.86m from Hungerford.

51.45--1.48

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 6 March 2026 to 06:00 on 7 March 2026.

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 6 March 2026 to 06:00 on 7 March 2026.

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 6 March 2026 to 06:00 on 7 March 2026.

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 6 March 2026 to 06:00 on 7 March 2026.

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

51.45--1.48

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

Lane Closures : Lanes 2 and 3 will be closed.

Due to: Roadworks are planned.

Status : Pending.

Schedule : From 20:00 on 6 March 2026 to 06:00 on 7 March 2026.

Lanes Closed : There will be two of three lanes closed.
Nearest town: 5.13m from Bristol.

51.51--2.52