M4 Traffic

M4 05:14am

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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:

CONGESTION
Location: The M4 westbound between junctions J19 (Bristol)and J20 (Bristol) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 01:30 and 01:45 on 30 Jan 2026.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 3.89m from Alveston. CLEARED @ 01:38
CONGESTION
Location: The M4 westbound between junctions J19 (Bristol)and J20 (Bristol) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 00:45 and 01:00 on 30 Jan 2026.
Nearest town: 3.89m from Alveston. CLEARED @ 00:53
J41 PENTYLA/BAGLAN TO J43 LLANDARCY
Description: M4WestboundJ41 (Port Talbot) Pentyla/Baglan to J43 (Neath) LlandarcyRoad closed31/01/26-02/02/26 2000-0600Diversions in place :,Start time: 31/01/2026 20:00 ,End Date:02/02/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 24/01/2026 8:10
Nearest town: 1.97m from Llandarcy. CLEARED @ 00:30
CONGESTION
Location: The M4 westbound between junctions J19 (Bristol)and J20 (Bristol) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 23:30 and 23:45 on 29 Jan 2026.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 3.89m from Alveston. CLEARED @ 23:32


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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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 J19 (Bristol)and J20 (Bristol) .

Due to: Congestion.



Normal traffic conditions are expected between 01:30 and 01:45 on 30 January 2026.

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

51.53--2.53

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

Due to: Congestion.



Normal traffic conditions are expected between 00:45 and 01:00 on 30 January 2026.
Nearest town: 3.89m from Alveston.

51.53--2.53

Description: M4 : Westbound : J41 (Port Talbot) Pentyla/Baglan to J43 (Neath) Llandarcy : Road closed : 31/01/26-02/02/26 2000-0600 : Diversions in place :,Start time: 31/01/2026 20:00 ,End Date:02/02/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 24/01/2026 8:10
Nearest town: 1.97m from Llandarcy.

51.63--3.82

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

Due to: Congestion.



Normal traffic conditions are expected between 23:30 and 23:45 on 29 January 2026.

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

51.53--2.53