M4 Traffic

M4 09:24am

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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:

J42 EARLSWOOD TO J43 LLANDARCY
Description: M4WestboundJ42 (Swansea) Earlswood to J43 (Neath) LlandarcyCongestionDelay: s possible :,Start time: 30/01/2026 8:03 ,Expected end time:30/01/2026 10:03,Severity: Moderate,Source: Welsh Government,Last updated: 30/01/2026 8:03
Nearest town: 0.62m from Llandarcy. CLEARED @ 08:18
J33 CAPEL LLANILLTERN
Description: M4EastboundJ33 (Cardiff) Capel LlanillternCongestionoffslipDelay: s possible :,Start time: 30/01/2026 7:45 ,Expected end time:30/01/2026 10:45,Severity: Moderate,Source: Welsh Government,Last updated: 30/01/2026 7:45
Nearest town: 1.63m from Pentyrch. CLEARED @ 07:54
ACCIDENT
Location: The M4 westbound between junctions J19 (Bristol)and J20 (Bristol) .
Lane closures: The hard shoulder is closed.
Reason: Road traffic collision.
Status: Currently Active.
Time to clear: The event is expected to clear between 10:00 and 10:15 on 30 Jan 2026.
Return to normal: Normal traffic conditions are expected between 10:00 and 10:15 on 30 Jan 2026.
Nearest town: 3.75m from Alveston. CLEARED @ 08:59
J38 MARGAM
Description: M4EastboundJ38 (Port Talbot) MargamOffslip closed25/01/26-04/02/26 2000-0600 :,Start time: 25/01/2026 20:00 ,End Date:04/02/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 25/01/2026 20:00
Nearest town: 0.13m from Margam.
CONGESTION
Location: The M4 westbound entry slip at junction J19 (Bristol) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 08:45 and 09:00 on 30 Jan 2026.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 5.12m from Alveston. CLEARED @ 08:50
CONGESTION
Location: The M4 westbound exit slip at junction J19 (Bristol) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 08:30 and 08:45 on 30 Jan 2026.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 5.08m from Bristol. CLEARED @ 08:32
CONGESTION
Location: The M4 westbound at junction J19 (Bristol) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 08:30 and 08:45 on 30 Jan 2026.
CauseRoad traffic collision.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 3.89m from Alveston. CLEARED @ 08:41


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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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 : Westbound : J42 (Swansea) Earlswood to J43 (Neath) Llandarcy : Congestion : Delays possible :,Start time: 30/01/2026 8:03 ,Expected end time:30/01/2026 10:03,Severity: Moderate,Source: Welsh Government,Last updated: 30/01/2026 8:03
Nearest town: 0.62m from Llandarcy.

51.64--3.84

Description: M4 : Eastbound : J33 (Cardiff) Capel Llanilltern : Congestion : offslip : Delays possible :,Start time: 30/01/2026 7:45 ,Expected end time:30/01/2026 10:45,Severity: Moderate,Source: Welsh Government,Last updated: 30/01/2026 7:45
Nearest town: 1.63m from Pentyrch.

51.51--3.31

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

Lane Closures : The hard shoulder is closed.

Due to: Road traffic collision.



Time To Clear : The event is expected to clear between 10:00 and 10:15 on 30 January 2026.

Normal traffic conditions are expected between 10:00 and 10:15 on 30 January 2026.
Nearest town: 3.75m from Alveston.

51.53--2.54

Description: M4 : Eastbound : J38 (Port Talbot) Margam : Offslip closed : 25/01/26-04/02/26 2000-0600 :,Start time: 25/01/2026 20:00 ,End Date:04/02/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 25/01/2026 20:00
Nearest town: 0.13m from Margam.

51.56--3.74

Location: westbound entry slip at junction J19 (Bristol) .

Due to: Congestion.



Normal traffic conditions are expected between 08:45 and 09:00 on 30 January 2026.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 5.12m from Alveston.

51.51--2.52

Location: westbound exit slip at junction J19 (Bristol) .

Due to: Congestion.



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

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 5.08m from Bristol.

51.51--2.52

Location: westbound at junction J19 (Bristol) .

Due to: Congestion.



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

Cause : Road traffic collision.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 3.89m from Alveston.

51.53--2.53