M4 Traffic

M4 10:04am

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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 between junctions J8 (High Wycombe)and J10 (Reading) .
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 10:30 and 10:45 on 11 Jun 2025.
Return to normal: Normal traffic conditions are expected between 10:30 and 10:45 on 11 Jun 2025.
Lanes closed: There is one of four lanes closed.
Nearest town: 3.5m from Bracknell.
J33 CAPEL LLANILLTERN
Description: M4EastboundJ33 (Cardiff) Capel LlanillternCongestionoffslipDelay: s possible :,Start time: 11/06/2025 7:26 ,Expected end time:11/06/2025 9:26,Severity: Moderate,Source: Welsh Government,Last updated: 11/06/2025 7:26
Nearest town: 1.63m from Pentyrch. CLEARED @ 07:42
J28 TREDEGAR PARK TO J24 COLDRA
Description: M4EastboundJ28 (Newport) Tredegar Park to J24 (Newport) ColdraCongestionDelay: s possible :,Start time: 11/06/2025 6:55 ,Expected end time:11/06/2025 9:55,Severity: Moderate,Source: Welsh Government,Last updated: 11/06/2025 6:55
Nearest town: 1.5m from Newport. CLEARED @ 07:06
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 09:30 and 09:45 on 11 Jun 2025.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 1.74m from Reading. CLEARED @ 09:35
CONGESTION
Location: The M4 westbound exit slip at junction J5 (Colnbrook) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 09:00 and 09:15 on 11 Jun 2025.
Nearest town: 2m from Slough. CLEARED @ 09:08
CONGESTION
Location: The M4 eastbound between junctions J22 (Avonmouth)and J21 (Chepstow) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 08:30 and 08:45 on 11 Jun 2025.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 3.78m from Alveston. CLEARED @ 08:41
J47 PENLLERGAER TO J46 LLANGYFELACH
Description: M4EastboundJ47 (Swansea) Penllergaer to J46 (Swansea) LlangyfelachCarriageway maintenanceRoad closedDiversions in place11/06/25-12/06/25 1900-0200 :,Start time: 11/06/2025 19:00 ,End Date:12/06/2025 2:00,Severity: Road closure,Source: Welsh Government, Last updated: 07/06/2025 7:00
Nearest town: 1.81m from Felindre. CLEARED @ 07:42
J48 HENDY TO J47 PENLLERGAER
Description: M4EastboundJ48 (Pontarddulais) Hendy to J47 (Swansea) PenllergaerCarriageway maintenanceRoad closedDiversions in place11/06/25-12/06/25 1900-0200 :,Start time: 11/06/2025 19:00 ,End Date:12/06/2025 2:00,Severity: Road closure,Source: Welsh Government, Last updated: 07/06/2025 7:02
Nearest town: 0.89m from Grovesend. CLEARED @ 07:42


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 eastbound entry slip at junction J4B (Heathrow) from the M25 anti-clockwise.
Reason: Barrier repairs are planned.
Status: Pending.
Schedule: Expect disruption everyday between 10:00 and 16:00 from 18 Jun 2025 to 19 Jun 2025.
Nearest town: 2.87m from Heathrow.

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 between junctions J8 (High Wycombe)and J10 (Reading) .

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 10:30 and 10:45 on 11 June 2025.

Normal traffic conditions are expected between 10:30 and 10:45 on 11 June 2025.

Lanes Closed : There is one of four lanes closed.
Nearest town: 3.5m from Bracknell.

51.45--0.81

Description: M4 : Eastbound : J33 (Cardiff) Capel Llanilltern : Congestion : offslip : Delays possible :,Start time: 11/06/2025 7:26 ,Expected end time:11/06/2025 9:26,Severity: Moderate,Source: Welsh Government,Last updated: 11/06/2025 7:26
Nearest town: 1.63m from Pentyrch.

51.51--3.31

Description: M4 : Eastbound : J28 (Newport) Tredegar Park to J24 (Newport) Coldra : Congestion : Delays possible :,Start time: 11/06/2025 6:55 ,Expected end time:11/06/2025 9:55,Severity: Moderate,Source: Welsh Government,Last updated: 11/06/2025 6:55
Nearest town: 1.5m from Newport.

51.6--3

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

Due to: Congestion.



Normal traffic conditions are expected between 09:30 and 09:45 on 11 June 2025.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 1.74m from Reading.

51.41--0.98

Location: westbound exit slip at junction J5 (Colnbrook) .

Due to: Congestion.



Normal traffic conditions are expected between 09:00 and 09:15 on 11 June 2025.
Nearest town: 2m from Slough.

51.49--0.54

Location: eastbound between junctions J22 (Avonmouth)and J21 (Chepstow) .

Due to: Congestion.



Normal traffic conditions are expected between 08:30 and 08:45 on 11 June 2025.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 3.78m from Alveston.

51.57--2.62

Description: M4 : Eastbound : J47 (Swansea) Penllergaer to J46 (Swansea) Llangyfelach : Carriageway maintenance : Road closed : Diversions in place : 11/06/25-12/06/25 1900-0200 :,Start time: 11/06/2025 19:00 ,End Date:12/06/2025 2:00,Severity: Road closure,Source: Welsh Government, Last updated: 07/06/2025 7:00
Nearest town: 1.81m from Felindre.

51.68--3.98

Description: M4 : Eastbound : J48 (Pontarddulais) Hendy to J47 (Swansea) Penllergaer : Carriageway maintenance : Road closed : Diversions in place : 11/06/25-12/06/25 1900-0200 :,Start time: 11/06/2025 19:00 ,End Date:12/06/2025 2:00,Severity: Road closure,Source: Welsh Government, Last updated: 07/06/2025 7:02
Nearest town: 0.89m from Grovesend.

51.7--4.03

Location: eastbound entry slip at junction J4B (Heathrow) from the M25 anti-clockwise.

Due to: Barrier repairs are planned.

Status : Pending.

Schedule : Expect disruption everyday between 10:00 and 16:00 from 18 June 2025 to 19 June 2025.
Nearest town: 2.87m from Heathrow.

51.5--0.49