M4 Traffic

M4 12:04pm

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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:

EASTBOUND
Description: M4Now clearEastboundJ33 (Cardiff) Capel Llanilltern,Start time: 19/03/2026 10:27 ,Expected end time:19/03/2026 10:32,Severity: Moderate,Source: Welsh Government,Last updated: 19/03/2026 10:27
Nearest town: 1.63m from Pentyrch. CLEARED @ 11:42
VEHICLE RECOVERY
Location: The M4 eastbound between junctions J22 (Avonmouth)and J20 (Bristol) .
Lane closures: The hard shoulder and lane 1 are closed.
Reason: Vehicle tyre change.
Status: Currently Active.
Time to clear: The event is expected to clear between 10:30 and 10:45 on 19 Mar 2026.
Return to normal: Normal traffic conditions are expected between 10:30 and 10:45 on 19 Mar 2026.
Lanes closed: There is one of three lanes closed.
Nearest town: 2.29m from Alveston. CLEARED @ 10:21
J33 CAPEL LLANILLTERN
Description: M4EastboundJ33 (Cardiff) Capel LlanillternCongestionoffslipDelay: s possible :,Start time: 19/03/2026 7:19 ,Expected end time:19/03/2026 10:19,Severity: Moderate,Source: Welsh Government,Last updated: 19/03/2026 7:19
Nearest town: 1.63m from Pentyrch. CLEARED @ 07:30
J27 HIGH CROSS TO J23A MAGOR
Description: M4EastboundJ27 (High Cross) High Cross to J23A (Magor) MagorCongestionDelay: s possible :,Start time: 19/03/2026 6:56 ,Expected end time:19/03/2026 10:55,Severity: Moderate,Source: Welsh Government,Last updated: 19/03/2026 6:56
Nearest town: 1.31m from Caerleon. CLEARED @ 07:18
CONGESTION
Location: The M4 eastbound between junctions J6 (Slough)and J5 (Colnbrook) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 09:45 and 10:00 on 19 Mar 2026.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 0.55m from Slough. CLEARED @ 09:45
J43 LLANDARCY
Description: M4EastboundJ43 (Neath) LlandarcyOnslip closedRoadworks16/03/26-22/03/26 2000-0600 :,Start time: 16/03/2026 20:00 ,End Date:22/03/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 16/03/2026 20:00
Nearest town: 0.02m from Llandarcy. CLEARED @ 09:18
J42 EARLSWOOD TO J41 PENTYLA/BAGLAN
Description: M4EastboundJ42 (Swansea) Earlswood to J41 (Port Talbot) Pentyla/BaglanRoadworksRoad closed16/03/26-22/03/26 2000-0600Diversions in place :,Start time: 16/03/2026 20:00 ,End Date:22/03/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 16/03/2026 20:00
Nearest town: 1.92m from Port Talbot. CLEARED @ 09:18
J23 ROGIET TO J22 PILNING/PRINCE OF WALES BRIDGE
Description: M4EastboundJ23 (Chepstow) Rogiet to J22 (Avonmouth) Pilning/Prince of Wales BridgeRoad closed16/03/26-20/03/26 2100-0600 :,Start time: 16/03/2026 21:00 ,End Date:20/03/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 16/03/2026 21:00
Nearest town: 0.81m from Portskewett. CLEARED @ 09:06
J26 MALPAS
Description: M4WestboundJ26 (Newport) MalpasOffslip closedMaintenance work16/03/26-21/03/26 2000-0600 :,Start time: 16/03/2026 20:00 ,End Date:21/03/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 16/03/2026 20:00
Nearest town: 1.53m from Newport. CLEARED @ 09:06
J38 MARGAM TO J37 PYLE
Description: M4EastboundJ38 (Port Talbot) Margam to J37 (Porthcawl) PyleRoad closedMaintenance work16/03/26-21/03/26 2000-0600Diversions in place :,Start time: 16/03/2026 20:00 ,End Date:21/03/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 16/03/2026 20:00
Nearest town: 1.25m from Kenfig. CLEARED @ 09:06
J37 PYLE TO J39 GROES
Description: M4WestboundJ37 (Porthcawl) Pyle to J39 GroesRoad closed16/03/26-21/03/26 2000-0600Diversions in placeMaintenance work :,Start time: 16/03/2026 20:00 ,End Date:21/03/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 16/03/2026 20:00
Nearest town: 1.55m from Kenfig. CLEARED @ 09:06
CONGESTION
Location: The M4 eastbound between junctions J3 (Heathrow)and J2 (N.Circular) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 08:30 and 08:45 on 19 Mar 2026.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 1.83m from Hounslow. CLEARED @ 08:34
CONGESTION
Location: The M4 eastbound exit slip at junction J11 (Basingstoke) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 10:15 and 10:30 on 19 Mar 2026.
Nearest town: 1.74m from Reading. CLEARED @ 10:21
CONGESTION
Location: The M4 eastbound between junctions J3 (Heathrow)and J2 (N.Circular) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 07:30 and 07:45 on 19 Mar 2026.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 2.2m from Hounslow. CLEARED @ 07:39
CONGESTION
Location: The M4 eastbound between junctions J3 (Heathrow)and J2 (N.Circular) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 07:00 and 07:15 on 19 Mar 2026.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 1.83m from Hounslow. CLEARED @ 07:04


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 exit slip at junction J13 (Newbury) .
Lane closures: Lane one will be closed.
Reason: Roadworks are planned.
Status: Pending.
Schedule: Expect disruption everyday between 20:00 and 06:00 from 19 Mar 2026 to 21 Mar 2026.
Lanes Closed: There will be one of two lanes closed.
Nearest town: 0.59m from Chieveley.
ROAD WORKS
Location: The M4 westbound between junctions J12 (Reading)and J13 (Newbury) .
Reason: Roadworks scheme is planned.
Status: Pending.
Schedule: From 20:00 on 19 Mar 2026 to 06:00 on 21 Mar 2026.
Nearest town: 2.56m from Chieveley.
ROAD WORKS
Location: The M4 eastbound between junctions J20 (Bristol)and J19 (Bristol) .
Lane closures: Lane one will be closed.
Reason: Barrier repairs are planned.
Status: Pending.
Schedule: From 21:00 on 20 Mar 2026 to 06:00 on 21 Mar 2026.
Lanes Closed: There will be one of three lanes closed.
Nearest town: 3.48m from Alveston.
ROAD WORKS
Location: The M4 westbound between junctions J12 (Reading)and J13 (Newbury) .
Lane closures: Lane one will be closed.
Reason: Roadworks are planned.
Status: Pending.
Schedule: Expect disruption everyday between 20:00 and 06:00 from 19 Mar 2026 to 21 Mar 2026.
Lanes Closed: There will be one of three lanes closed.
Nearest town: 2.56m from Chieveley.
ROAD WORKS
Location: The M4 westbound between junctions J8 (High Wycombe)and J10 (Reading) .
Lane closures: Lanes 1 and 2 will be closed.
Reason: Barrier repairs are planned.
Status: Pending.
Schedule: From 20:00 on 23 Mar 2026 to 06:00 on 24 Mar 2026.
Lanes Closed: There will be two of four lanes closed.
Nearest town: 3.79m from Bracknell.
ROAD WORKS
Location: The M4 westbound at junction J10 (Reading) .
Lane closures: Lanes 1 and 2 will be closed.
Reason: Barrier repairs are planned.
Status: Pending.
Schedule: From 20:00 on 23 Mar 2026 to 06:00 on 24 Mar 2026.
Lanes Closed: There will be two of three lanes closed.
Nearest town: 4.32m from Bracknell.
ROAD WORKS
Location: The M4 westbound between junctions J10 (Reading)and J11 (Basingstoke) .
Lane closures: Lanes 1 and 2 will be closed.
Reason: Barrier repairs are planned.
Status: Pending.
Schedule: From 20:00 on 23 Mar 2026 to 06:00 on 24 Mar 2026.
Lanes Closed: There will be two of four lanes closed.
Nearest town: 4.95m from Bracknell.

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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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:

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Transport for LondonTransport for London (TFL)

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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 : Now clear : Eastbound : J33 (Cardiff) Capel Llanilltern,Start time: 19/03/2026 10:27 ,Expected end time:19/03/2026 10:32,Severity: Moderate,Source: Welsh Government,Last updated: 19/03/2026 10:27
Nearest town: 1.63m from Pentyrch.

51.51--3.31

Location: eastbound between junctions J22 (Avonmouth)and J20 (Bristol) .

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

Due to: Vehicle tyre change.



Time To Clear : The event is expected to clear between 10:30 and 10:45 on 19 March 2026.

Normal traffic conditions are expected between 10:30 and 10:45 on 19 March 2026.

Lanes Closed : There is one of three lanes closed.
Nearest town: 2.29m from Alveston.

51.57--2.57

Description: M4 : Eastbound : J33 (Cardiff) Capel Llanilltern : Congestion : offslip : Delays possible :,Start time: 19/03/2026 7:19 ,Expected end time:19/03/2026 10:19,Severity: Moderate,Source: Welsh Government,Last updated: 19/03/2026 7:19
Nearest town: 1.63m from Pentyrch.

51.51--3.31

Description: M4 : Eastbound : J27 (High Cross) High Cross to J23A (Magor) Magor : Congestion : Delays possible :,Start time: 19/03/2026 6:56 ,Expected end time:19/03/2026 10:55,Severity: Moderate,Source: Welsh Government,Last updated: 19/03/2026 6:56
Nearest town: 1.31m from Caerleon.

51.6--2.95

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

Due to: Congestion.



Normal traffic conditions are expected between 09:45 and 10:00 on 19 March 2026.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 0.55m from Slough.

51.49--0.58

Description: M4 : Eastbound : J43 (Neath) Llandarcy : Onslip closed : Roadworks : 16/03/26-22/03/26 2000-0600 :,Start time: 16/03/2026 20:00 ,End Date:22/03/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 16/03/2026 20:00
Nearest town: 0.02m from Llandarcy.

51.65--3.85

Description: M4 : Eastbound : J42 (Swansea) Earlswood to J41 (Port Talbot) Pentyla/Baglan : Roadworks : Road closed : 16/03/26-22/03/26 2000-0600 : Diversions in place :,Start time: 16/03/2026 20:00 ,End Date:22/03/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 16/03/2026 20:00
Nearest town: 1.92m from Port Talbot.

51.62--3.82

Description: M4 : Eastbound : J23 (Chepstow) Rogiet to J22 (Avonmouth) Pilning/Prince of Wales Bridge : Road closed : 16/03/26-20/03/26 2100-0600 :,Start time: 16/03/2026 21:00 ,End Date:20/03/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 16/03/2026 21:00
Nearest town: 0.81m from Portskewett.

51.58--2.74

Description: M4 : Westbound : J26 (Newport) Malpas : Offslip closed : Maintenance work : 16/03/26-21/03/26 2000-0600 :,Start time: 16/03/2026 20:00 ,End Date:21/03/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 16/03/2026 20:00
Nearest town: 1.53m from Newport.

51.6--3.01

Description: M4 : Eastbound : J38 (Port Talbot) Margam to J37 (Porthcawl) Pyle : Road closed : Maintenance work : 16/03/26-21/03/26 2000-0600 : Diversions in place :,Start time: 16/03/2026 20:00 ,End Date:21/03/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 16/03/2026 20:00
Nearest town: 1.25m from Kenfig.

51.53--3.73

Description: M4 : Westbound : J37 (Porthcawl) Pyle to J39 Groes : Road closed : 16/03/26-21/03/26 2000-0600 : Diversions in place : Maintenance work :,Start time: 16/03/2026 20:00 ,End Date:21/03/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 16/03/2026 20:00
Nearest town: 1.55m from Kenfig.

51.54--3.73

Location: eastbound between junctions J3 (Heathrow)and J2 (N.Circular) .

Due to: Congestion.



Normal traffic conditions are expected between 08:30 and 08:45 on 19 March 2026.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 1.83m from Hounslow.

51.49--0.36

Location: eastbound exit slip at junction J11 (Basingstoke) .

Due to: Congestion.



Normal traffic conditions are expected between 10:15 and 10:30 on 19 March 2026.
Nearest town: 1.74m from Reading.

51.41--0.98

Location: eastbound between junctions J3 (Heathrow)and J2 (N.Circular) .

Due to: Congestion.



Normal traffic conditions are expected between 07:30 and 07:45 on 19 March 2026.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 2.2m from Hounslow.

51.49--0.39

Location: eastbound between junctions J3 (Heathrow)and J2 (N.Circular) .

Due to: Congestion.



Normal traffic conditions are expected between 07:00 and 07:15 on 19 March 2026.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 1.83m from Hounslow.

51.49--0.36

Location: westbound exit slip at junction J13 (Newbury) .

Lane Closures : Lane one will be closed.

Due to: Roadworks are planned.

Status : Pending.

Schedule : Expect disruption everyday between 20:00 and 06:00 from 19 March 2026 to 21 March 2026.

Lanes Closed : There will be one of two lanes closed.
Nearest town: 0.59m from Chieveley.

51.45--1.3

Location: westbound between junctions J12 (Reading)and J13 (Newbury) .

Due to: Roadworks scheme is planned.

Status : Pending.

Schedule : From 20:00 on 19 March 2026 to 06:00 on 21 March 2026.
Nearest town: 2.56m from Chieveley.

51.46--1.26

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

Lane Closures : Lane one will be closed.

Due to: Barrier repairs are planned.

Status : Pending.

Schedule : From 21:00 on 20 March 2026 to 06:00 on 21 March 2026.

Lanes Closed : There will be one of three lanes closed.
Nearest town: 3.48m from Alveston.

51.54--2.54

Location: westbound between junctions J12 (Reading)and J13 (Newbury) .

Lane Closures : Lane one will be closed.

Due to: Roadworks are planned.

Status : Pending.

Schedule : Expect disruption everyday between 20:00 and 06:00 from 19 March 2026 to 21 March 2026.

Lanes Closed : There will be one of three lanes closed.
Nearest town: 2.56m from Chieveley.

51.46--1.26

Location: westbound between junctions J8 (High Wycombe)and J10 (Reading) .

Lane Closures : Lanes 1 and 2 will be closed.

Due to: Barrier repairs are planned.

Status : Pending.

Schedule : From 20:00 on 23 March 2026 to 06:00 on 24 March 2026.

Lanes Closed : There will be two of four lanes closed.
Nearest town: 3.79m from Bracknell.

51.44--0.83

Location: westbound at junction J10 (Reading) .

Lane Closures : Lanes 1 and 2 will be closed.

Due to: Barrier repairs are planned.

Status : Pending.

Schedule : From 20:00 on 23 March 2026 to 06:00 on 24 March 2026.

Lanes Closed : There will be two of three lanes closed.
Nearest town: 4.32m from Bracknell.

51.44--0.85

Location: westbound between junctions J10 (Reading)and J11 (Basingstoke) .

Lane Closures : Lanes 1 and 2 will be closed.

Due to: Barrier repairs are planned.

Status : Pending.

Schedule : From 20:00 on 23 March 2026 to 06:00 on 24 March 2026.

Lanes Closed : There will be two of four lanes closed.
Nearest town: 4.95m from Bracknell.

51.43--0.86