M4 Traffic

M4 11:14am

SLIGHT
SEVERE
FULL SCREENUPDATED: 11:14
×
×

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:

EASTBOUND
Description: M4Now clearEastboundJ33 (Cardiff) Capel Llanilltern,Start time: 18/06/2026 10:05 ,Expected end time:18/06/2026 9:04,Severity: Moderate,Source: Welsh Government,Last updated: 18/06/2026 10:05
Nearest town: 1.63m from Pentyrch. CLEARED @ 10:18
ACCIDENT
Location: The M4 eastbound between junctions J5 (Colnbrook)and J4B (Heathrow) .
Lane closures: The hard shoulder and lane 1 are closed.
Reason: Road traffic collision.
Status: Currently Active.
Time to clear: The event is expected to clear between 11:15 and 11:30 on 18 Jun 2026.
Return to normal: Normal traffic conditions are expected between 11:15 and 11:30 on 18 Jun 2026.
Lanes closed: There is one of five lanes closed.
Nearest town: 2.88m from Datchet. CLEARED @ 09:36
J30 CARDIFF GATE
Description: M4EastboundJ30 (Cardiff) Cardiff GateCongestionoffslipDelay: s possible :,Start time: 18/06/2026 8:23 ,Expected end time:18/06/2026 11:23,Severity: Moderate,Source: Welsh Government,Last updated: 18/06/2026 8:23
Nearest town: 1.77m from Saint Mellons. CLEARED @ 08:30
J32 CORYTON
Description: M4EastboundJ32 (Cardiff) CorytonoffslipCongestionDelay: s possible :,Start time: 18/06/2026 7:39 ,Expected end time:18/06/2026 9:09,Severity: Moderate,Source: Welsh Government,Last updated: 18/06/2026 7:39
Nearest town: 1.51m from Llandaff. CLEARED @ 07:54
BROKEN DOWN VEHICLE
Location: The M4 eastbound between junctions J10 (Reading)and J8 (High Wycombe) .
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 08:15 and 08:30 on 18 Jun 2026.
Return to normal: Normal traffic conditions are expected between 08:15 and 08:30 on 18 Jun 2026.
Lanes closed: There is one of four lanes closed.
Nearest town: 1.7m from Bray. CLEARED @ 07:48
J33 CAPEL LLANILLTERN
Description: M4EastboundJ33 (Cardiff) Capel LlanillternCongestionoffslipDelay: s possible :,Start time: 18/06/2026 7:25 ,Expected end time:18/06/2026 11:25,Severity: Moderate,Source: Welsh Government,Last updated: 18/06/2026 7:25
Nearest town: 1.63m from Pentyrch. CLEARED @ 07:42
BROKEN DOWN VEHICLE
Location: The M4 eastbound at junction 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 07:15 and 07:30 on 18 Jun 2026.
Return to normal: Normal traffic conditions are expected between 07:15 and 07:30 on 18 Jun 2026.
Lanes closed: There is one of three lanes closed.
Nearest town: 4.73m from Bracknell. CLEARED @ 06:45
CONGESTION
Location: The M4 westbound exit slip at junction J6 (Slough) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 11:00 and 11:15 on 18 Jun 2026.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 0.59m from Eton.
CONGESTION
Location: The M4 eastbound at junction J5 (Colnbrook) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 09:30 and 09:45 on 18 Jun 2026.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 1.85m from Slough. CLEARED @ 09:27
CONGESTION
Location: The M4 eastbound exit slip at junction J4 .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 08:45 and 09:00 on 18 Jun 2026.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 2.06m from Heathrow. CLEARED @ 08:51
CONGESTION
Location: The M4 eastbound between junctions J6 (Slough)and J5 (Colnbrook) .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 09:00 and 09:15 on 18 Jun 2026.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 1.85m from Slough. CLEARED @ 08:51
CONGESTION
Location: The M4 eastbound exit slip at junction J4 .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 08:15 and 08:30 on 18 Jun 2026.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 2.05m from Heathrow. CLEARED @ 08:15
CONGESTION
Location: The M4 eastbound exit slip at junction J4 .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 07:30 and 07:45 on 18 Jun 2026.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 2.06m from Heathrow. CLEARED @ 07:39
CONGESTION
Location: The M4 eastbound exit slip at junction J4 .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 06:45 and 07:00 on 18 Jun 2026.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 2.04m from Heathrow. CLEARED @ 06:54


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.

Let's Get Social

Get in touch with us or stay up to date with our latest news and updates.

Follow us on Facebook See Traffic Update on Twitter See our Pinterest Images View our Blog

Live Email Traffic Alerts

Get live email alerts whenever there is a traffic incident or roadworks on the M4 that may cause congestion or jams.

Sign up for free alerts

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.

Advertise on Traffic UpdateYOUR AD HERE

Advertise to millions of motorists, holidaymakers and commuters.

Description: M4 : Now clear : Eastbound : J33 (Cardiff) Capel Llanilltern,Start time: 18/06/2026 10:05 ,Expected end time:18/06/2026 9:04,Severity: Moderate,Source: Welsh Government,Last updated: 18/06/2026 10:05
Nearest town: 1.63m from Pentyrch.

51.51--3.31

Location: eastbound between junctions J5 (Colnbrook)and J4B (Heathrow) .

Lane Closures : The hard shoulder and lane 1 are closed.

Due to: Road traffic collision.



Time To Clear : The event is expected to clear between 11:15 and 11:30 on 18 June 2026.

Normal traffic conditions are expected between 11:15 and 11:30 on 18 June 2026.

Lanes Closed : There is one of five lanes closed.
Nearest town: 2.88m from Datchet.

51.49--0.51

Description: M4 : Eastbound : J30 (Cardiff) Cardiff Gate : Congestion : offslip : Delays possible :,Start time: 18/06/2026 8:23 ,Expected end time:18/06/2026 11:23,Severity: Moderate,Source: Welsh Government,Last updated: 18/06/2026 8:23
Nearest town: 1.77m from Saint Mellons.

51.54--3.13

Description: M4 : Eastbound : J32 (Cardiff) Coryton : offslip : Congestion : Delays possible :,Start time: 18/06/2026 7:39 ,Expected end time:18/06/2026 9:09,Severity: Moderate,Source: Welsh Government,Last updated: 18/06/2026 7:39
Nearest town: 1.51m from Llandaff.

51.53--3.25

Location: eastbound between junctions J10 (Reading)and J8 (High Wycombe) .

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 08:15 and 08:30 on 18 June 2026.

Normal traffic conditions are expected between 08:15 and 08:30 on 18 June 2026.

Lanes Closed : There is one of four lanes closed.
Nearest town: 1.7m from Bray.

51.49--0.74

Description: M4 : Eastbound : J33 (Cardiff) Capel Llanilltern : Congestion : offslip : Delays possible :,Start time: 18/06/2026 7:25 ,Expected end time:18/06/2026 11:25,Severity: Moderate,Source: Welsh Government,Last updated: 18/06/2026 7:25
Nearest town: 1.63m from Pentyrch.

51.51--3.31

Location: eastbound at junction 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 07:15 and 07:30 on 18 June 2026.

Normal traffic conditions are expected between 07:15 and 07:30 on 18 June 2026.

Lanes Closed : There is one of three lanes closed.
Nearest town: 4.73m from Bracknell.

51.43--0.86

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

Due to: Congestion.



Normal traffic conditions are expected between 11:00 and 11:15 on 18 June 2026.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 0.59m from Eton.

51.5--0.61

Location: eastbound at junction J5 (Colnbrook) .

Due to: Congestion.



Normal traffic conditions are expected between 09:30 and 09:45 on 18 June 2026.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 1.85m from Slough.

51.49--0.54

Location: eastbound exit slip at junction J4 .

Due to: Congestion.



Normal traffic conditions are expected between 08:45 and 09:00 on 18 June 2026.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 2.06m from Heathrow.

51.5--0.46

Location: eastbound between junctions J6 (Slough)and J5 (Colnbrook) .

Due to: Congestion.



Normal traffic conditions are expected between 09:00 and 09:15 on 18 June 2026.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 1.85m from Slough.

51.49--0.54

Location: eastbound exit slip at junction J4 .

Due to: Congestion.



Normal traffic conditions are expected between 08:15 and 08:30 on 18 June 2026.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 2.05m from Heathrow.

51.5--0.46

Location: eastbound exit slip at junction J4 .

Due to: Congestion.



Normal traffic conditions are expected between 07:30 and 07:45 on 18 June 2026.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 2.06m from Heathrow.

51.5--0.46

Location: eastbound exit slip at junction J4 .

Due to: Congestion.



Normal traffic conditions are expected between 06:45 and 07:00 on 18 June 2026.

Delay : There are currently delays of 10 minutes against expected traffic.
Nearest town: 2.04m from Heathrow.

51.5--0.45