M4 Traffic

M4 08:24am

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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:

J26 MALPAS TO J23A MAGOR
Description: M4EastboundJ26 (Newport) Malpas to J23A (Magor) MagorCongestionDelay: s possible :,Start time: 17/09/2026 7:18 ,Expected end time:17/09/2026 9:17,Severity: Moderate,Source: Welsh Government,Last updated: 17/09/2026 7:18
Nearest town: 1.58m from Caerleon. CLEARED @ 07:54
J32 CORYTON
Description: M4SouthboundJ32 (Cardiff) CorytonResurfacing workOffslip closedDiversions in place17/09/26-18/09/26 2000-0600 :,Start time: 17/09/2026 20:00 ,End Date:18/09/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 03/09/2026 16:25
Nearest town: 1.51m from Llandaff. CLEARED @ 07:54
J32 CORYTON
Description: M4EastboundJ32 (Cardiff) CorytonResurfacing workEntry slip road closedDiversions in place17/09/26-18/09/26 2000-0600 :,Start time: 17/09/2026 20:00 ,End Date:18/09/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 03/09/2026 16:24
Nearest town: 1.51m from Llandaff. CLEARED @ 07:54
J48 HENDY
Description: M4WestboundJ48 (Pontarddulais) Hendy17/09/26-18/09/26 1900-0600Carriageway maintenanceExit slip road closedDiversions in place :,Start time: 17/09/2026 19:00 ,End Date:18/09/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 12/09/2026 10:38
Nearest town: 0.44m from Hendy. CLEARED @ 07:54
J46 LLANGYFELACH TO J45 YNYSFORGAN
Description: M4EastboundJ46 (Swansea) Llangyfelach to J45 (Swansea) Ynysforgan17/09/26-18/09/26 1900-0100Carriageway maintenanceClosedDiversions in place :,Start time: 17/09/2026 19:00 ,End Date:18/09/2026 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 12/09/2026 10:15
Nearest town: 1.63m from Clydach. CLEARED @ 07:54
J39 GROES
Description: M4WestboundJ39 Groes15/09/26-19/09/26 2000-0600Entry slip road closedDiversions in place :,Start time: 15/09/2026 20:00 ,End Date:19/09/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 15/09/2026 20:00
Nearest town: 0.58m from Margam. CLEARED @ 07:54
J35 PENCOED
Description: M4EastboundJ35 (Pen-coed) Pencoed15/09/26-09/10/26 1900-0600Clearance workExit slip road closedDiversions in place :,Start time: 15/09/2026 19:00 ,End Date:09/10/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 15/09/2026 19:00
Nearest town: 1.94m from Llangan. CLEARED @ 07:54
J34 MISKIN TO J38 MARGAM
Description: M4WestboundJ34 (Llantrisant) Miskin to J38 (Port Talbot) Margam14/09/26-19/09/26 2000-0600SurveysEntry slip road closedDiversions in place :,Start time: 14/09/2026 20:00 ,End Date:19/09/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 14/09/2026 20:00
Nearest town: 1.91m from Bridgend. CLEARED @ 07:54
J23A MAGOR
Description: M4EastboundJ23A (Magor) Magor17/09/26-18/09/26 2000-0600Clearance workOffslip closedDiversions in place :,Start time: 17/09/2026 20:00 ,End Date:18/09/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 12/09/2026 8:37
Nearest town: 0.64m from Magor. CLEARED @ 07:54
J32 CORYTON
Description: M4SouthboundJ32 (Cardiff) CorytonResurfacing workOnslip closedDiversions in place22/09/26-23/09/26 2000-0600 :,Start time: 22/09/2026 20:00 ,End Date:23/09/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 03/09/2026 16:27
Nearest town: 1.51m from Llandaff. CLEARED @ 07:54
J38 MARGAM TO J42 EARLSWOOD
Description: M4Both directionsJ38 (Port Talbot) Margam to J42 (Swansea) EarlswoodResurfacing workRoad closedDiversions in place20/09/26-25/09/26 2000-0600 :,Start time: 20/09/2026 20:00 ,End Date:25/09/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 15/09/2026 18:14
Nearest town: 0.22m from Port Talbot. CLEARED @ 07:54
J38 MARGAM TO J37 PYLE
Description: M4EastboundJ38 (Port Talbot) Margam to J37 (Porthcawl) Pyle19/09/26-26/09/26 2000-0600J38: Entry slip road closed2 lanes closedSurveysDiversions in place :,Start time: 19/09/2026 20:00 ,End Date:26/09/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 12/09/2026 9:39
Nearest town: 1.25m from Kenfig. CLEARED @ 07:54
J37 PYLE TO J33 CAPEL LLANILLTERN
Description: M4EastboundJ37 (Porthcawl) Pyle to J33 (Cardiff) Capel Llanilltern19/09/26-26/09/26 2000-0600SurveysEntry slip road closed1 lane closedDiversions in place :,Start time: 19/09/2026 20:00 ,End Date:26/09/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 12/09/2026 9:31
Nearest town: 1.94m from Llangan. CLEARED @ 07:54
J23 ROGIET TO J22 PILNING/PRINCE OF WALES BRIDGE
Description: M4EastboundJ23 (Chepstow) Rogiet to J22 (Avonmouth) Pilning/Prince of Wales Bridge19/09/26-21/09/26 2100-0600Maintenance workClosedDiversions in place :,Start time: 19/09/2026 21:00 ,End Date:21/09/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 12/09/2026 8:13
Nearest town: 0.81m from Portskewett. CLEARED @ 07:54


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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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 : J26 (Newport) Malpas to J23A (Magor) Magor : Congestion : Delays possible :,Start time: 17/09/2026 7:18 ,Expected end time:17/09/2026 9:17,Severity: Moderate,Source: Welsh Government,Last updated: 17/09/2026 7:18
Nearest town: 1.58m from Caerleon.

51.6--2.93

Description: M4 : Southbound : J32 (Cardiff) Coryton : Resurfacing work : Offslip closed : Diversions in place : 17/09/26-18/09/26 2000-0600 :,Start time: 17/09/2026 20:00 ,End Date:18/09/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 03/09/2026 16:25
Nearest town: 1.51m from Llandaff.

51.53--3.25

Description: M4 : Eastbound : J32 (Cardiff) Coryton : Resurfacing work : Entry slip road closed : Diversions in place : 17/09/26-18/09/26 2000-0600 :,Start time: 17/09/2026 20:00 ,End Date:18/09/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 03/09/2026 16:24
Nearest town: 1.51m from Llandaff.

51.53--3.25

Description: M4 : Westbound : J48 (Pontarddulais) Hendy : 17/09/26-18/09/26 1900-0600 : Carriageway maintenance : Exit slip road closed : Diversions in place :,Start time: 17/09/2026 19:00 ,End Date:18/09/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 12/09/2026 10:38
Nearest town: 0.44m from Hendy.

51.71--4.06

Description: M4 : Eastbound : J46 (Swansea) Llangyfelach to J45 (Swansea) Ynysforgan : 17/09/26-18/09/26 1900-0100 : Carriageway maintenance : Closed : Diversions in place :,Start time: 17/09/2026 19:00 ,End Date:18/09/2026 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 12/09/2026 10:15
Nearest town: 1.63m from Clydach.

51.68--3.94

Description: M4 : Westbound : J39 Groes : 15/09/26-19/09/26 2000-0600 : Entry slip road closed : Diversions in place :,Start time: 15/09/2026 20:00 ,End Date:19/09/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 15/09/2026 20:00
Nearest town: 0.58m from Margam.

51.57--3.75

Description: M4 : Eastbound : J35 (Pen-coed) Pencoed : 15/09/26-09/10/26 1900-0600 : Clearance work : Exit slip road closed : Diversions in place :,Start time: 15/09/2026 19:00 ,End Date:09/10/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 15/09/2026 19:00
Nearest town: 1.94m from Llangan.

51.51--3.5

Description: M4 : Westbound : J34 (Llantrisant) Miskin to J38 (Port Talbot) Margam : 14/09/26-19/09/26 2000-0600 : Surveys : Entry slip road closed : Diversions in place :,Start time: 14/09/2026 20:00 ,End Date:19/09/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 14/09/2026 20:00
Nearest town: 1.91m from Bridgend.

51.53--3.57

Description: M4 : Eastbound : J23A (Magor) Magor : 17/09/26-18/09/26 2000-0600 : Clearance work : Offslip closed : Diversions in place :,Start time: 17/09/2026 20:00 ,End Date:18/09/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 12/09/2026 8:37
Nearest town: 0.64m from Magor.

51.59--2.84

Description: M4 : Southbound : J32 (Cardiff) Coryton : Resurfacing work : Onslip closed : Diversions in place : 22/09/26-23/09/26 2000-0600 :,Start time: 22/09/2026 20:00 ,End Date:23/09/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 03/09/2026 16:27
Nearest town: 1.51m from Llandaff.

51.53--3.25

Description: M4 : Both directions : J38 (Port Talbot) Margam to J42 (Swansea) Earlswood : Resurfacing work : Road closed : Diversions in place : 20/09/26-25/09/26 2000-0600 :,Start time: 20/09/2026 20:00 ,End Date:25/09/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 15/09/2026 18:14
Nearest town: 0.22m from Port Talbot.

51.6--3.79

Description: M4 : Eastbound : J38 (Port Talbot) Margam to J37 (Porthcawl) Pyle : 19/09/26-26/09/26 2000-0600 : J38: Entry slip road closed : 2 lanes closed : Surveys : Diversions in place :,Start time: 19/09/2026 20:00 ,End Date:26/09/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 12/09/2026 9:39
Nearest town: 1.25m from Kenfig.

51.53--3.73

Description: M4 : Eastbound : J37 (Porthcawl) Pyle to J33 (Cardiff) Capel Llanilltern : 19/09/26-26/09/26 2000-0600 : Surveys : Entry slip road closed : 1 lane closed : Diversions in place :,Start time: 19/09/2026 20:00 ,End Date:26/09/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 12/09/2026 9:31
Nearest town: 1.94m from Llangan.

51.51--3.5

Description: M4 : Eastbound : J23 (Chepstow) Rogiet to J22 (Avonmouth) Pilning/Prince of Wales Bridge : 19/09/26-21/09/26 2100-0600 : Maintenance work : Closed : Diversions in place :,Start time: 19/09/2026 21:00 ,End Date:21/09/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 12/09/2026 8:13
Nearest town: 0.81m from Portskewett.

51.58--2.74