M4 Traffic

M4 00:04am

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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:

BROKEN DOWN VEHICLE
Location: The M4 westbound entry slip at junction J6 (Slough) .
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 19:00 and 19:15 on 1 Mar 2025.
Return to normal: Normal traffic conditions are expected between 19:00 and 19:15 on 1 Mar 2025.
Lanes closed: There is one of two lanes closed.
Nearest town: 0.86m from Eton. CLEARED @ 18:35
J44 LON LAS
Description: M4WestboundJ44 (Swansea) Lon Las06/03/25-07/03/25 1930-0100Cyclic maintenanceEntry slip road closedDiversions in place :,Start time: 06/03/2025 19:30 ,End Date:07/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:41
Nearest town: 1.28m from Glais. CLEARED @ 23:18
J22 PILNING/PRINCE OF WALES BRIDGE TO J23 ROGIET
Description: M4WestboundJ22 (Avonmouth) Pilning/Prince of Wales Bridge to J23 (Chepstow) Rogiet04/03/25-05/03/25 2100-0600Maintenance workDiversions in place :,Start time: 04/03/2025 21:00 ,End Date:05/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 14:08
Nearest town: 0.81m from Portskewett. CLEARED @ 23:18
J28 TREDEGAR PARK
Description: M4WestboundJ28 (Newport) Tredegar Park02/03/25-07/03/25 2000-0600Clearance workEntry slip road closedDiversions in place :,Start time: 02/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:46
Nearest town: 1.15m from Bassaleg. CLEARED @ 23:18
J45 YNYSFORGAN
Description: M4WestboundJ45 (Swansea) Ynysforgan02/03/25-03/03/25 2000-0600Improvement workEntry slip road closedDiversions in place :,Start time: 02/03/2025 20:00 ,End Date:03/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:32
Nearest town: 0.77m from Clydach. CLEARED @ 23:18
J44 LON LAS
Description: M4EastboundJ44 (Swansea) Lon Las05/03/25-06/03/25 1930-0100Cyclic maintenanceEntry slip road closedDiversions in place :,Start time: 05/03/2025 19:30 ,End Date:06/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:38
Nearest town: 1.28m from Glais. CLEARED @ 23:18
J48 HENDY
Description: M4EastboundJ48 (Pontarddulais) Hendy03/03/25-08/03/25 2000-0600onslipCarriageway maintenanceClosedDiversions in place :,Start time: 03/03/2025 20:00 ,End Date:08/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:25
Nearest town: 0.44m from Hendy. CLEARED @ 23:18
J28 TREDEGAR PARK
Description: M4EastboundJ28 (Newport) Tredegar Park03/03/25-07/03/25 2000-0600Clearance workExit slip road closedDiversions in place :,Start time: 03/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:44
Nearest town: 1.15m from Bassaleg. CLEARED @ 23:18
J44 LON LAS
Description: M4WestboundJ44 (Swansea) Lon Las06/03/25-07/03/25 1930-0100Cyclic maintenanceEntry slip road closedDiversions in place :,Start time: 06/03/2025 19:30 ,End Date:07/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:41
Nearest town: 1.28m from Glais. CLEARED @ 23:06
J28 TREDEGAR PARK
Description: M4EastboundJ28 (Newport) Tredegar Park03/03/25-07/03/25 2000-0600Clearance workExit slip road closedDiversions in place :,Start time: 03/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:44
Nearest town: 1.15m from Bassaleg. CLEARED @ 23:06
J45 YNYSFORGAN
Description: M4WestboundJ45 (Swansea) Ynysforgan02/03/25-03/03/25 2000-0600Improvement workEntry slip road closedDiversions in place :,Start time: 02/03/2025 20:00 ,End Date:03/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:32
Nearest town: 0.77m from Clydach. CLEARED @ 23:06
J28 TREDEGAR PARK
Description: M4WestboundJ28 (Newport) Tredegar Park02/03/25-07/03/25 2000-0600Clearance workEntry slip road closedDiversions in place :,Start time: 02/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:46
Nearest town: 1.15m from Bassaleg. CLEARED @ 23:06
J22 PILNING/PRINCE OF WALES BRIDGE TO J23 ROGIET
Description: M4WestboundJ22 (Avonmouth) Pilning/Prince of Wales Bridge to J23 (Chepstow) Rogiet04/03/25-05/03/25 2100-0600Maintenance workDiversions in place :,Start time: 04/03/2025 21:00 ,End Date:05/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 14:08
Nearest town: 0.81m from Portskewett. CLEARED @ 23:06
J48 HENDY
Description: M4EastboundJ48 (Pontarddulais) Hendy03/03/25-08/03/25 2000-0600onslipCarriageway maintenanceClosedDiversions in place :,Start time: 03/03/2025 20:00 ,End Date:08/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:25
Nearest town: 0.44m from Hendy. CLEARED @ 23:06
J44 LON LAS
Description: M4EastboundJ44 (Swansea) Lon Las05/03/25-06/03/25 1930-0100Cyclic maintenanceEntry slip road closedDiversions in place :,Start time: 05/03/2025 19:30 ,End Date:06/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:38
Nearest town: 1.28m from Glais. CLEARED @ 23:06
J48 HENDY
Description: M4EastboundJ48 (Pontarddulais) Hendy03/03/25-08/03/25 2000-0600onslipCarriageway maintenanceClosedDiversions in place :,Start time: 03/03/2025 20:00 ,End Date:08/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:25
Nearest town: 0.44m from Hendy. CLEARED @ 22:42
J44 LON LAS
Description: M4WestboundJ44 (Swansea) Lon Las06/03/25-07/03/25 1930-0100Cyclic maintenanceEntry slip road closedDiversions in place :,Start time: 06/03/2025 19:30 ,End Date:07/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:41
Nearest town: 1.28m from Glais. CLEARED @ 22:42
J45 YNYSFORGAN
Description: M4WestboundJ45 (Swansea) Ynysforgan02/03/25-03/03/25 2000-0600Improvement workEntry slip road closedDiversions in place :,Start time: 02/03/2025 20:00 ,End Date:03/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:32
Nearest town: 0.77m from Clydach. CLEARED @ 22:42
J44 LON LAS
Description: M4EastboundJ44 (Swansea) Lon Las05/03/25-06/03/25 1930-0100Cyclic maintenanceEntry slip road closedDiversions in place :,Start time: 05/03/2025 19:30 ,End Date:06/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:38
Nearest town: 1.28m from Glais. CLEARED @ 22:42
J28 TREDEGAR PARK
Description: M4EastboundJ28 (Newport) Tredegar Park03/03/25-07/03/25 2000-0600Clearance workExit slip road closedDiversions in place :,Start time: 03/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:44
Nearest town: 1.15m from Bassaleg. CLEARED @ 22:42
J28 TREDEGAR PARK
Description: M4WestboundJ28 (Newport) Tredegar Park02/03/25-07/03/25 2000-0600Clearance workEntry slip road closedDiversions in place :,Start time: 02/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:46
Nearest town: 1.15m from Bassaleg. CLEARED @ 22:42
J22 PILNING/PRINCE OF WALES BRIDGE TO J23 ROGIET
Description: M4WestboundJ22 (Avonmouth) Pilning/Prince of Wales Bridge to J23 (Chepstow) Rogiet04/03/25-05/03/25 2100-0600Maintenance workDiversions in place :,Start time: 04/03/2025 21:00 ,End Date:05/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 14:08
Nearest town: 0.81m from Portskewett. CLEARED @ 22:42
J28 TREDEGAR PARK
Description: M4EastboundJ28 (Newport) Tredegar Park03/03/25-07/03/25 2000-0600Clearance workExit slip road closedDiversions in place :,Start time: 03/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:44
Nearest town: 1.15m from Bassaleg. CLEARED @ 22:30
J28 TREDEGAR PARK
Description: M4WestboundJ28 (Newport) Tredegar Park02/03/25-07/03/25 2000-0600Clearance workEntry slip road closedDiversions in place :,Start time: 02/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:46
Nearest town: 1.15m from Bassaleg. CLEARED @ 22:30
J22 PILNING/PRINCE OF WALES BRIDGE TO J23 ROGIET
Description: M4WestboundJ22 (Avonmouth) Pilning/Prince of Wales Bridge to J23 (Chepstow) Rogiet04/03/25-05/03/25 2100-0600Maintenance workDiversions in place :,Start time: 04/03/2025 21:00 ,End Date:05/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 14:08
Nearest town: 0.81m from Portskewett. CLEARED @ 22:30
J48 HENDY
Description: M4EastboundJ48 (Pontarddulais) Hendy03/03/25-08/03/25 2000-0600onslipCarriageway maintenanceClosedDiversions in place :,Start time: 03/03/2025 20:00 ,End Date:08/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:25
Nearest town: 0.44m from Hendy. CLEARED @ 22:30
J45 YNYSFORGAN
Description: M4WestboundJ45 (Swansea) Ynysforgan02/03/25-03/03/25 2000-0600Improvement workEntry slip road closedDiversions in place :,Start time: 02/03/2025 20:00 ,End Date:03/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:32
Nearest town: 0.77m from Clydach. CLEARED @ 22:30
J44 LON LAS
Description: M4EastboundJ44 (Swansea) Lon Las05/03/25-06/03/25 1930-0100Cyclic maintenanceEntry slip road closedDiversions in place :,Start time: 05/03/2025 19:30 ,End Date:06/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:38
Nearest town: 1.28m from Glais. CLEARED @ 22:30
J44 LON LAS
Description: M4WestboundJ44 (Swansea) Lon Las06/03/25-07/03/25 1930-0100Cyclic maintenanceEntry slip road closedDiversions in place :,Start time: 06/03/2025 19:30 ,End Date:07/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:41
Nearest town: 1.28m from Glais. CLEARED @ 22:30
J45 YNYSFORGAN
Description: M4WestboundJ45 (Swansea) Ynysforgan02/03/25-03/03/25 2000-0600Improvement workEntry slip road closedDiversions in place :,Start time: 02/03/2025 20:00 ,End Date:03/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:32
Nearest town: 0.77m from Clydach. CLEARED @ 22:18
J22 PILNING/PRINCE OF WALES BRIDGE TO J23 ROGIET
Description: M4WestboundJ22 (Avonmouth) Pilning/Prince of Wales Bridge to J23 (Chepstow) Rogiet04/03/25-05/03/25 2100-0600Maintenance workDiversions in place :,Start time: 04/03/2025 21:00 ,End Date:05/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 14:08
Nearest town: 0.81m from Portskewett. CLEARED @ 22:18
J28 TREDEGAR PARK
Description: M4EastboundJ28 (Newport) Tredegar Park03/03/25-07/03/25 2000-0600Clearance workExit slip road closedDiversions in place :,Start time: 03/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:44
Nearest town: 1.15m from Bassaleg. CLEARED @ 22:18
J28 TREDEGAR PARK
Description: M4WestboundJ28 (Newport) Tredegar Park02/03/25-07/03/25 2000-0600Clearance workEntry slip road closedDiversions in place :,Start time: 02/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:46
Nearest town: 1.15m from Bassaleg. CLEARED @ 22:18
J48 HENDY
Description: M4EastboundJ48 (Pontarddulais) Hendy03/03/25-08/03/25 2000-0600onslipCarriageway maintenanceClosedDiversions in place :,Start time: 03/03/2025 20:00 ,End Date:08/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:25
Nearest town: 0.44m from Hendy. CLEARED @ 22:18
J44 LON LAS
Description: M4WestboundJ44 (Swansea) Lon Las06/03/25-07/03/25 1930-0100Cyclic maintenanceEntry slip road closedDiversions in place :,Start time: 06/03/2025 19:30 ,End Date:07/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:41
Nearest town: 1.28m from Glais. CLEARED @ 22:18
J44 LON LAS
Description: M4EastboundJ44 (Swansea) Lon Las05/03/25-06/03/25 1930-0100Cyclic maintenanceEntry slip road closedDiversions in place :,Start time: 05/03/2025 19:30 ,End Date:06/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:38
Nearest town: 1.28m from Glais. CLEARED @ 22:18
J48 HENDY
Description: M4EastboundJ48 (Pontarddulais) Hendy03/03/25-08/03/25 2000-0600onslipCarriageway maintenanceClosedDiversions in place :,Start time: 03/03/2025 20:00 ,End Date:08/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:25
Nearest town: 0.44m from Hendy. CLEARED @ 20:42
J28 TREDEGAR PARK
Description: M4WestboundJ28 (Newport) Tredegar Park02/03/25-07/03/25 2000-0600Clearance workEntry slip road closedDiversions in place :,Start time: 02/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:46
Nearest town: 1.15m from Bassaleg. CLEARED @ 20:42
J22 PILNING/PRINCE OF WALES BRIDGE TO J23 ROGIET
Description: M4WestboundJ22 (Avonmouth) Pilning/Prince of Wales Bridge to J23 (Chepstow) Rogiet04/03/25-05/03/25 2100-0600Maintenance workDiversions in place :,Start time: 04/03/2025 21:00 ,End Date:05/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 14:08
Nearest town: 0.81m from Portskewett. CLEARED @ 20:42
J28 TREDEGAR PARK
Description: M4EastboundJ28 (Newport) Tredegar Park03/03/25-07/03/25 2000-0600Clearance workExit slip road closedDiversions in place :,Start time: 03/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:44
Nearest town: 1.15m from Bassaleg. CLEARED @ 20:42
J44 LON LAS
Description: M4EastboundJ44 (Swansea) Lon Las05/03/25-06/03/25 1930-0100Cyclic maintenanceEntry slip road closedDiversions in place :,Start time: 05/03/2025 19:30 ,End Date:06/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:38
Nearest town: 1.28m from Glais. CLEARED @ 20:42
J44 LON LAS
Description: M4WestboundJ44 (Swansea) Lon Las06/03/25-07/03/25 1930-0100Cyclic maintenanceEntry slip road closedDiversions in place :,Start time: 06/03/2025 19:30 ,End Date:07/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:41
Nearest town: 1.28m from Glais. CLEARED @ 20:42
J45 YNYSFORGAN
Description: M4WestboundJ45 (Swansea) Ynysforgan02/03/25-03/03/25 2000-0600Improvement workEntry slip road closedDiversions in place :,Start time: 02/03/2025 20:00 ,End Date:03/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:32
Nearest town: 0.77m from Clydach. CLEARED @ 20:42
J44 LON LAS
Description: M4EastboundJ44 (Swansea) Lon Las05/03/25-06/03/25 1930-0100Cyclic maintenanceEntry slip road closedDiversions in place :,Start time: 05/03/2025 19:30 ,End Date:06/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:38
Nearest town: 1.28m from Glais. CLEARED @ 20:30
J48 HENDY
Description: M4EastboundJ48 (Pontarddulais) Hendy03/03/25-08/03/25 2000-0600onslipCarriageway maintenanceClosedDiversions in place :,Start time: 03/03/2025 20:00 ,End Date:08/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:25
Nearest town: 0.44m from Hendy. CLEARED @ 20:30
J44 LON LAS
Description: M4WestboundJ44 (Swansea) Lon Las06/03/25-07/03/25 1930-0100Cyclic maintenanceEntry slip road closedDiversions in place :,Start time: 06/03/2025 19:30 ,End Date:07/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:41
Nearest town: 1.28m from Glais. CLEARED @ 20:30
J28 TREDEGAR PARK
Description: M4WestboundJ28 (Newport) Tredegar Park02/03/25-07/03/25 2000-0600Clearance workEntry slip road closedDiversions in place :,Start time: 02/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:46
Nearest town: 1.15m from Bassaleg. CLEARED @ 20:30
J22 PILNING/PRINCE OF WALES BRIDGE TO J23 ROGIET
Description: M4WestboundJ22 (Avonmouth) Pilning/Prince of Wales Bridge to J23 (Chepstow) Rogiet04/03/25-05/03/25 2100-0600Maintenance workDiversions in place :,Start time: 04/03/2025 21:00 ,End Date:05/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 14:08
Nearest town: 0.81m from Portskewett. CLEARED @ 20:30
J45 YNYSFORGAN
Description: M4WestboundJ45 (Swansea) Ynysforgan02/03/25-03/03/25 2000-0600Improvement workEntry slip road closedDiversions in place :,Start time: 02/03/2025 20:00 ,End Date:03/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:32
Nearest town: 0.77m from Clydach. CLEARED @ 20:30
J28 TREDEGAR PARK
Description: M4EastboundJ28 (Newport) Tredegar Park03/03/25-07/03/25 2000-0600Clearance workExit slip road closedDiversions in place :,Start time: 03/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:44
Nearest town: 1.15m from Bassaleg. CLEARED @ 20:30
J28 TREDEGAR PARK
Description: M4EastboundJ28 (Newport) Tredegar Park03/03/25-07/03/25 2000-0600Clearance workExit slip road closedDiversions in place :,Start time: 03/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:44
Nearest town: 1.15m from Bassaleg. CLEARED @ 20:06
J28 TREDEGAR PARK
Description: M4WestboundJ28 (Newport) Tredegar Park02/03/25-07/03/25 2000-0600Clearance workEntry slip road closedDiversions in place :,Start time: 02/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:46
Nearest town: 1.15m from Bassaleg. CLEARED @ 20:06
J22 PILNING/PRINCE OF WALES BRIDGE TO J23 ROGIET
Description: M4WestboundJ22 (Avonmouth) Pilning/Prince of Wales Bridge to J23 (Chepstow) Rogiet04/03/25-05/03/25 2100-0600Maintenance workDiversions in place :,Start time: 04/03/2025 21:00 ,End Date:05/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 14:08
Nearest town: 0.81m from Portskewett. CLEARED @ 20:06
J44 LON LAS
Description: M4WestboundJ44 (Swansea) Lon Las06/03/25-07/03/25 1930-0100Cyclic maintenanceEntry slip road closedDiversions in place :,Start time: 06/03/2025 19:30 ,End Date:07/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:41
Nearest town: 1.28m from Glais. CLEARED @ 20:06
J45 YNYSFORGAN
Description: M4WestboundJ45 (Swansea) Ynysforgan02/03/25-03/03/25 2000-0600Improvement workEntry slip road closedDiversions in place :,Start time: 02/03/2025 20:00 ,End Date:03/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:32
Nearest town: 0.77m from Clydach. CLEARED @ 20:06


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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Location: westbound entry slip at junction J6 (Slough) .

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 19:00 and 19:15 on 1 March 2025.

Normal traffic conditions are expected between 19:00 and 19:15 on 1 March 2025.

Lanes Closed : There is one of two lanes closed.
Nearest town: 0.86m from Eton.

51.5--0.62

Description: M4 : Westbound : J44 (Swansea) Lon Las : 06/03/25-07/03/25 1930-0100 : Cyclic maintenance : Entry slip road closed : Diversions in place :,Start time: 06/03/2025 19:30 ,End Date:07/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:41
Nearest town: 1.28m from Glais.

51.66--3.88

Description: M4 : Westbound : J22 (Avonmouth) Pilning/Prince of Wales Bridge to J23 (Chepstow) Rogiet : 04/03/25-05/03/25 2100-0600 : Maintenance work : Diversions in place :,Start time: 04/03/2025 21:00 ,End Date:05/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 14:08
Nearest town: 0.81m from Portskewett.

51.58--2.74

Description: M4 : Westbound : J28 (Newport) Tredegar Park : 02/03/25-07/03/25 2000-0600 : Clearance work : Entry slip road closed : Diversions in place :,Start time: 02/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:46
Nearest town: 1.15m from Bassaleg.

51.56--3.04

Description: M4 : Westbound : J45 (Swansea) Ynysforgan : 02/03/25-03/03/25 2000-0600 : Improvement work : Entry slip road closed : Diversions in place :,Start time: 02/03/2025 20:00 ,End Date:03/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:32
Nearest town: 0.77m from Clydach.

51.68--3.92

Description: M4 : Eastbound : J44 (Swansea) Lon Las : 05/03/25-06/03/25 1930-0100 : Cyclic maintenance : Entry slip road closed : Diversions in place :,Start time: 05/03/2025 19:30 ,End Date:06/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:38
Nearest town: 1.28m from Glais.

51.66--3.88

Description: M4 : Eastbound : J48 (Pontarddulais) Hendy : 03/03/25-08/03/25 2000-0600 : onslip : Carriageway maintenance : Closed : Diversions in place :,Start time: 03/03/2025 20:00 ,End Date:08/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:25
Nearest town: 0.44m from Hendy.

51.71--4.06

Description: M4 : Eastbound : J28 (Newport) Tredegar Park : 03/03/25-07/03/25 2000-0600 : Clearance work : Exit slip road closed : Diversions in place :,Start time: 03/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:44
Nearest town: 1.15m from Bassaleg.

51.56--3.04

Description: M4 : Westbound : J44 (Swansea) Lon Las : 06/03/25-07/03/25 1930-0100 : Cyclic maintenance : Entry slip road closed : Diversions in place :,Start time: 06/03/2025 19:30 ,End Date:07/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:41
Nearest town: 1.28m from Glais.

51.66--3.88

Description: M4 : Eastbound : J28 (Newport) Tredegar Park : 03/03/25-07/03/25 2000-0600 : Clearance work : Exit slip road closed : Diversions in place :,Start time: 03/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:44
Nearest town: 1.15m from Bassaleg.

51.56--3.04

Description: M4 : Westbound : J45 (Swansea) Ynysforgan : 02/03/25-03/03/25 2000-0600 : Improvement work : Entry slip road closed : Diversions in place :,Start time: 02/03/2025 20:00 ,End Date:03/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:32
Nearest town: 0.77m from Clydach.

51.68--3.92

Description: M4 : Westbound : J28 (Newport) Tredegar Park : 02/03/25-07/03/25 2000-0600 : Clearance work : Entry slip road closed : Diversions in place :,Start time: 02/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:46
Nearest town: 1.15m from Bassaleg.

51.56--3.04

Description: M4 : Westbound : J22 (Avonmouth) Pilning/Prince of Wales Bridge to J23 (Chepstow) Rogiet : 04/03/25-05/03/25 2100-0600 : Maintenance work : Diversions in place :,Start time: 04/03/2025 21:00 ,End Date:05/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 14:08
Nearest town: 0.81m from Portskewett.

51.58--2.74

Description: M4 : Eastbound : J48 (Pontarddulais) Hendy : 03/03/25-08/03/25 2000-0600 : onslip : Carriageway maintenance : Closed : Diversions in place :,Start time: 03/03/2025 20:00 ,End Date:08/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:25
Nearest town: 0.44m from Hendy.

51.71--4.06

Description: M4 : Eastbound : J44 (Swansea) Lon Las : 05/03/25-06/03/25 1930-0100 : Cyclic maintenance : Entry slip road closed : Diversions in place :,Start time: 05/03/2025 19:30 ,End Date:06/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:38
Nearest town: 1.28m from Glais.

51.66--3.88

Description: M4 : Eastbound : J48 (Pontarddulais) Hendy : 03/03/25-08/03/25 2000-0600 : onslip : Carriageway maintenance : Closed : Diversions in place :,Start time: 03/03/2025 20:00 ,End Date:08/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:25
Nearest town: 0.44m from Hendy.

51.71--4.06

Description: M4 : Westbound : J44 (Swansea) Lon Las : 06/03/25-07/03/25 1930-0100 : Cyclic maintenance : Entry slip road closed : Diversions in place :,Start time: 06/03/2025 19:30 ,End Date:07/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:41
Nearest town: 1.28m from Glais.

51.66--3.88

Description: M4 : Westbound : J45 (Swansea) Ynysforgan : 02/03/25-03/03/25 2000-0600 : Improvement work : Entry slip road closed : Diversions in place :,Start time: 02/03/2025 20:00 ,End Date:03/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:32
Nearest town: 0.77m from Clydach.

51.68--3.92

Description: M4 : Eastbound : J44 (Swansea) Lon Las : 05/03/25-06/03/25 1930-0100 : Cyclic maintenance : Entry slip road closed : Diversions in place :,Start time: 05/03/2025 19:30 ,End Date:06/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:38
Nearest town: 1.28m from Glais.

51.66--3.88

Description: M4 : Eastbound : J28 (Newport) Tredegar Park : 03/03/25-07/03/25 2000-0600 : Clearance work : Exit slip road closed : Diversions in place :,Start time: 03/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:44
Nearest town: 1.15m from Bassaleg.

51.56--3.04

Description: M4 : Westbound : J28 (Newport) Tredegar Park : 02/03/25-07/03/25 2000-0600 : Clearance work : Entry slip road closed : Diversions in place :,Start time: 02/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:46
Nearest town: 1.15m from Bassaleg.

51.56--3.04

Description: M4 : Westbound : J22 (Avonmouth) Pilning/Prince of Wales Bridge to J23 (Chepstow) Rogiet : 04/03/25-05/03/25 2100-0600 : Maintenance work : Diversions in place :,Start time: 04/03/2025 21:00 ,End Date:05/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 14:08
Nearest town: 0.81m from Portskewett.

51.58--2.74

Description: M4 : Eastbound : J28 (Newport) Tredegar Park : 03/03/25-07/03/25 2000-0600 : Clearance work : Exit slip road closed : Diversions in place :,Start time: 03/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:44
Nearest town: 1.15m from Bassaleg.

51.56--3.04

Description: M4 : Westbound : J28 (Newport) Tredegar Park : 02/03/25-07/03/25 2000-0600 : Clearance work : Entry slip road closed : Diversions in place :,Start time: 02/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:46
Nearest town: 1.15m from Bassaleg.

51.56--3.04

Description: M4 : Westbound : J22 (Avonmouth) Pilning/Prince of Wales Bridge to J23 (Chepstow) Rogiet : 04/03/25-05/03/25 2100-0600 : Maintenance work : Diversions in place :,Start time: 04/03/2025 21:00 ,End Date:05/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 14:08
Nearest town: 0.81m from Portskewett.

51.58--2.74

Description: M4 : Eastbound : J48 (Pontarddulais) Hendy : 03/03/25-08/03/25 2000-0600 : onslip : Carriageway maintenance : Closed : Diversions in place :,Start time: 03/03/2025 20:00 ,End Date:08/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:25
Nearest town: 0.44m from Hendy.

51.71--4.06

Description: M4 : Westbound : J45 (Swansea) Ynysforgan : 02/03/25-03/03/25 2000-0600 : Improvement work : Entry slip road closed : Diversions in place :,Start time: 02/03/2025 20:00 ,End Date:03/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:32
Nearest town: 0.77m from Clydach.

51.68--3.92

Description: M4 : Eastbound : J44 (Swansea) Lon Las : 05/03/25-06/03/25 1930-0100 : Cyclic maintenance : Entry slip road closed : Diversions in place :,Start time: 05/03/2025 19:30 ,End Date:06/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:38
Nearest town: 1.28m from Glais.

51.66--3.88

Description: M4 : Westbound : J44 (Swansea) Lon Las : 06/03/25-07/03/25 1930-0100 : Cyclic maintenance : Entry slip road closed : Diversions in place :,Start time: 06/03/2025 19:30 ,End Date:07/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:41
Nearest town: 1.28m from Glais.

51.66--3.88

Description: M4 : Westbound : J45 (Swansea) Ynysforgan : 02/03/25-03/03/25 2000-0600 : Improvement work : Entry slip road closed : Diversions in place :,Start time: 02/03/2025 20:00 ,End Date:03/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:32
Nearest town: 0.77m from Clydach.

51.68--3.92

Description: M4 : Westbound : J22 (Avonmouth) Pilning/Prince of Wales Bridge to J23 (Chepstow) Rogiet : 04/03/25-05/03/25 2100-0600 : Maintenance work : Diversions in place :,Start time: 04/03/2025 21:00 ,End Date:05/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 14:08
Nearest town: 0.81m from Portskewett.

51.58--2.74

Description: M4 : Eastbound : J28 (Newport) Tredegar Park : 03/03/25-07/03/25 2000-0600 : Clearance work : Exit slip road closed : Diversions in place :,Start time: 03/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:44
Nearest town: 1.15m from Bassaleg.

51.56--3.04

Description: M4 : Westbound : J28 (Newport) Tredegar Park : 02/03/25-07/03/25 2000-0600 : Clearance work : Entry slip road closed : Diversions in place :,Start time: 02/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:46
Nearest town: 1.15m from Bassaleg.

51.56--3.04

Description: M4 : Eastbound : J48 (Pontarddulais) Hendy : 03/03/25-08/03/25 2000-0600 : onslip : Carriageway maintenance : Closed : Diversions in place :,Start time: 03/03/2025 20:00 ,End Date:08/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:25
Nearest town: 0.44m from Hendy.

51.71--4.06

Description: M4 : Westbound : J44 (Swansea) Lon Las : 06/03/25-07/03/25 1930-0100 : Cyclic maintenance : Entry slip road closed : Diversions in place :,Start time: 06/03/2025 19:30 ,End Date:07/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:41
Nearest town: 1.28m from Glais.

51.66--3.88

Description: M4 : Eastbound : J44 (Swansea) Lon Las : 05/03/25-06/03/25 1930-0100 : Cyclic maintenance : Entry slip road closed : Diversions in place :,Start time: 05/03/2025 19:30 ,End Date:06/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:38
Nearest town: 1.28m from Glais.

51.66--3.88

Description: M4 : Eastbound : J48 (Pontarddulais) Hendy : 03/03/25-08/03/25 2000-0600 : onslip : Carriageway maintenance : Closed : Diversions in place :,Start time: 03/03/2025 20:00 ,End Date:08/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:25
Nearest town: 0.44m from Hendy.

51.71--4.06

Description: M4 : Westbound : J28 (Newport) Tredegar Park : 02/03/25-07/03/25 2000-0600 : Clearance work : Entry slip road closed : Diversions in place :,Start time: 02/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:46
Nearest town: 1.15m from Bassaleg.

51.56--3.04

Description: M4 : Westbound : J22 (Avonmouth) Pilning/Prince of Wales Bridge to J23 (Chepstow) Rogiet : 04/03/25-05/03/25 2100-0600 : Maintenance work : Diversions in place :,Start time: 04/03/2025 21:00 ,End Date:05/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 14:08
Nearest town: 0.81m from Portskewett.

51.58--2.74

Description: M4 : Eastbound : J28 (Newport) Tredegar Park : 03/03/25-07/03/25 2000-0600 : Clearance work : Exit slip road closed : Diversions in place :,Start time: 03/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:44
Nearest town: 1.15m from Bassaleg.

51.56--3.04

Description: M4 : Eastbound : J44 (Swansea) Lon Las : 05/03/25-06/03/25 1930-0100 : Cyclic maintenance : Entry slip road closed : Diversions in place :,Start time: 05/03/2025 19:30 ,End Date:06/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:38
Nearest town: 1.28m from Glais.

51.66--3.88

Description: M4 : Westbound : J44 (Swansea) Lon Las : 06/03/25-07/03/25 1930-0100 : Cyclic maintenance : Entry slip road closed : Diversions in place :,Start time: 06/03/2025 19:30 ,End Date:07/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:41
Nearest town: 1.28m from Glais.

51.66--3.88

Description: M4 : Westbound : J45 (Swansea) Ynysforgan : 02/03/25-03/03/25 2000-0600 : Improvement work : Entry slip road closed : Diversions in place :,Start time: 02/03/2025 20:00 ,End Date:03/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:32
Nearest town: 0.77m from Clydach.

51.68--3.92

Description: M4 : Eastbound : J44 (Swansea) Lon Las : 05/03/25-06/03/25 1930-0100 : Cyclic maintenance : Entry slip road closed : Diversions in place :,Start time: 05/03/2025 19:30 ,End Date:06/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:38
Nearest town: 1.28m from Glais.

51.66--3.88

Description: M4 : Eastbound : J48 (Pontarddulais) Hendy : 03/03/25-08/03/25 2000-0600 : onslip : Carriageway maintenance : Closed : Diversions in place :,Start time: 03/03/2025 20:00 ,End Date:08/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:25
Nearest town: 0.44m from Hendy.

51.71--4.06

Description: M4 : Westbound : J44 (Swansea) Lon Las : 06/03/25-07/03/25 1930-0100 : Cyclic maintenance : Entry slip road closed : Diversions in place :,Start time: 06/03/2025 19:30 ,End Date:07/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:41
Nearest town: 1.28m from Glais.

51.66--3.88

Description: M4 : Westbound : J28 (Newport) Tredegar Park : 02/03/25-07/03/25 2000-0600 : Clearance work : Entry slip road closed : Diversions in place :,Start time: 02/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:46
Nearest town: 1.15m from Bassaleg.

51.56--3.04

Description: M4 : Westbound : J22 (Avonmouth) Pilning/Prince of Wales Bridge to J23 (Chepstow) Rogiet : 04/03/25-05/03/25 2100-0600 : Maintenance work : Diversions in place :,Start time: 04/03/2025 21:00 ,End Date:05/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 14:08
Nearest town: 0.81m from Portskewett.

51.58--2.74

Description: M4 : Westbound : J45 (Swansea) Ynysforgan : 02/03/25-03/03/25 2000-0600 : Improvement work : Entry slip road closed : Diversions in place :,Start time: 02/03/2025 20:00 ,End Date:03/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:32
Nearest town: 0.77m from Clydach.

51.68--3.92

Description: M4 : Eastbound : J28 (Newport) Tredegar Park : 03/03/25-07/03/25 2000-0600 : Clearance work : Exit slip road closed : Diversions in place :,Start time: 03/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:44
Nearest town: 1.15m from Bassaleg.

51.56--3.04

Description: M4 : Eastbound : J28 (Newport) Tredegar Park : 03/03/25-07/03/25 2000-0600 : Clearance work : Exit slip road closed : Diversions in place :,Start time: 03/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:44
Nearest town: 1.15m from Bassaleg.

51.56--3.04

Description: M4 : Westbound : J28 (Newport) Tredegar Park : 02/03/25-07/03/25 2000-0600 : Clearance work : Entry slip road closed : Diversions in place :,Start time: 02/03/2025 20:00 ,End Date:07/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:46
Nearest town: 1.15m from Bassaleg.

51.56--3.04

Description: M4 : Westbound : J22 (Avonmouth) Pilning/Prince of Wales Bridge to J23 (Chepstow) Rogiet : 04/03/25-05/03/25 2100-0600 : Maintenance work : Diversions in place :,Start time: 04/03/2025 21:00 ,End Date:05/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 14:08
Nearest town: 0.81m from Portskewett.

51.58--2.74

Description: M4 : Westbound : J44 (Swansea) Lon Las : 06/03/25-07/03/25 1930-0100 : Cyclic maintenance : Entry slip road closed : Diversions in place :,Start time: 06/03/2025 19:30 ,End Date:07/03/2025 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:41
Nearest town: 1.28m from Glais.

51.66--3.88

Description: M4 : Westbound : J45 (Swansea) Ynysforgan : 02/03/25-03/03/25 2000-0600 : Improvement work : Entry slip road closed : Diversions in place :,Start time: 02/03/2025 20:00 ,End Date:03/03/2025 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 01/03/2025 9:32
Nearest town: 0.77m from Clydach.

51.68--3.92