M4 Traffic

M4 15:54pm

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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:

J48 HENDY TO J49 PONT ABRAHAM
Description: M4WestboundJ48 (Pontarddulais) Hendy to J49 Pont AbrahamCongestionDelay: s possible :,Start time: 22/04/2026 15:06 ,Expected end time:22/04/2026 19:06,Severity: Moderate,Source: Welsh Government,Last updated: 22/04/2026 15:06
Nearest town: 0.44m from Fforest. CLEARED @ 15:18
VEHICLE FIRE
Location: The M4 westbound between junctions J2 (N.Circular)and J3 (Heathrow) .
Lane closures: The hard shoulder and lane 1 are closed.
Reason: Vehicle fire.
Status: Currently Active.
Time to clear: The event is expected to clear between 14:00 and 14:15 on 22 Apr 2026.
Return to normal: Normal traffic conditions are expected between 14:00 and 14:15 on 22 Apr 2026.
Lanes closed: There is one of three lanes closed.
Nearest town: 1.89m from Hounslow. CLEARED @ 13:48
BROKEN DOWN VEHICLE
Location: The M4 westbound between junctions J3 (Heathrow)and J4 .
Lane closures: Lane one is closed.
Reason: Broken down vehicle.
Status: Currently Active.
Time to clear: The event is expected to clear between 13:45 and 14:00 on 22 Apr 2026.
Return to normal: Normal traffic conditions are expected between 13:45 and 14:00 on 22 Apr 2026.
Lanes closed: There is one of four lanes closed.
Nearest town: 1.96m from Heathrow. CLEARED @ 13:12
VEHICLE RECOVERY
Location: The M4 eastbound between junctions J18 (Bath)and J17 (Chippenham) .
Lane closures: The hard shoulder and lane 1 are closed.
Reason: Vehicle tyre change.
Status: Currently Active.
Time to clear: The event is expected to clear between 12:00 and 12:15 on 22 Apr 2026.
Return to normal: Normal traffic conditions are expected between 12:00 and 12:15 on 22 Apr 2026.
Lanes closed: There is one of three lanes closed.
Nearest town: 7.94m from Chippenham. CLEARED @ 12:09
EASTBOUND
Description: M4Now clearEastboundJ28 (Newport) Tredegar Park to J26 (Newport) Malpas,Start time: 22/04/2026 9:58 ,Expected end time:22/04/2026 10:03,Severity: Moderate,Source: Welsh Government,Last updated: 22/04/2026 9:58
Nearest town: 0.98m from Bassaleg. CLEARED @ 10:18
J48 HENDY
Description: M4WestboundJ48 (Pontarddulais) HendyoffslipClosedDiversions in place :,Start time: 20/04/2026 20:00 ,End Date:24/04/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 20/04/2026 20:00
Nearest town: 0.44m from Hendy.
J43 LLANDARCY
Description: M4WestboundJ43 (Neath) Llandarcy22/04/26-23/04/26 1930-0100ClosedDiversions in placeoffsliponslip :,Start time: 22/04/2026 19:30 ,End Date:23/04/2026 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 19/04/2026 15:17
Nearest town: 0.02m from Llandarcy.
J22 PILNING/PRINCE OF WALES BRIDGE TO J23 ROGIET
Description: M4WestboundJ22 (Avonmouth) Pilning/Prince of Wales Bridge to J23 (Chepstow) Rogiet22/04/26-24/04/26 2000-0600ClosedDiversions in place :,Start time: 22/04/2026 20:00 ,End Date:24/04/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 19/04/2026 15:06
Nearest town: 0.81m from Portskewett.
J28 TREDEGAR PARK TO J30 CARDIFF GATE
Description: M4WestboundJ28 (Newport) Tredegar Park to J30 (Cardiff) Cardiff Gate22/04/26-23/04/26 2000-0600ClosedDiversions in place :,Start time: 22/04/2026 20:00 ,End Date:23/04/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 19/04/2026 15:07
Nearest town: 0.58m from Castleton.
J30 CARDIFF GATE
Description: M4WestboundJ30 (Cardiff) Cardiff Gate23/04/26-24/04/26 2000-0600offslipClosedDiversions in place :,Start time: 23/04/2026 20:00 ,End Date:24/04/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 19/04/2026 15:08
Nearest town: 1.77m from Saint Mellons.
J32 CORYTON
Description: M4EastboundJ32 (Cardiff) Coryton20/04/26-25/04/26 2000-0600offslipClosedDiversions in place :,Start time: 20/04/2026 20:00 ,End Date:25/04/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 20/04/2026 20:00
Nearest town: 1.51m from Llandaff.
J33 CAPEL LLANILLTERN
Description: M4EastboundJ33 (Cardiff) Capel Llanilltern23/04/26-24/04/26 2000-0600offslipClosed :,Start time: 23/04/2026 20:00 ,End Date:24/04/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 19/04/2026 15:10
Nearest town: 1.63m from Pentyrch.
J35 PENCOED TO J37 PYLE
Description: M4WestboundJ35 (Pen-coed) Pencoed to J37 (Porthcawl) PyleClosedDiversions in place21/04/26-25/04/26 2000-0600 :,Start time: 21/04/2026 20:00 ,End Date:25/04/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 21/04/2026 20:00
Nearest town: 2.03m from Bridgend.
J41 PENTYLA/BAGLAN TO J40 TAIBACH
Description: M4EastboundJ41 (Port Talbot) Pentyla/Baglan to J40 (Port Talbot) Taibach23/04/26 1900-2300ClosedDiversions in place :,Start time: 23/04/2026 19:00 ,End Date:23/04/2026 23:00,Severity: Road closure,Source: Welsh Government, Last updated: 19/04/2026 15:14
Nearest town: 0.16m from Port Talbot.
J39 GROES TO J40 TAIBACH
Description: M4WestboundJ39 Groes to J40 (Port Talbot) Taibach22/04/26 1900-2300ClosedDiversions in place :,Start time: 22/04/2026 19:00 ,End Date:22/04/2026 23:00,Severity: Road closure,Source: Welsh Government, Last updated: 19/04/2026 15:13
Nearest town: 1.48m from Margam.
CONGESTION
Location: The M4 eastbound exit slip at junction J4 .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 14:15 and 14:30 on 22 Apr 2026.
Delay: There are currently delays of 10 minutes against expected traffic.
Nearest town: 2.04m from Heathrow. CLEARED @ 14:24
CONGESTION
Location: The M4 eastbound exit slip at junction J4 .
Reason: Congestion.
Status: Currently Active.
Return to normal: Normal traffic conditions are expected between 10:00 and 10:15 on 22 Apr 2026.
Nearest town: 2.04m from Heathrow. CLEARED @ 10:03


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 westbound between junctions J10 (Reading)and J11 (Basingstoke) .
Lane closures: Lanes 1 and 2 will be closed.
Reason: Barrier repairs are planned.
Status: Pending.
Schedule: From 21:00 on 22 Apr 2026 to 06:00 on 23 Apr 2026.
Lanes Closed: There will be two of four lanes closed.
Nearest town: 2.65m from Reading.
ROAD WORKS
Location: The M4 westbound at junction J11 (Basingstoke) .
Lane closures: Lanes 1 and 2 will be closed.
Reason: Barrier repairs are planned.
Status: Pending.
Schedule: From 21:00 on 22 Apr 2026 to 06:00 on 23 Apr 2026.
Lanes Closed: There will be two of three lanes closed.
Nearest town: 2.09m from Reading.
ROAD WORKS
Location: The M4 westbound exit slip at junction J11 (Basingstoke) .
Reason: Barrier repairs are planned.
Status: Pending.
Schedule: From 21:00 on 22 Apr 2026 to 06:00 on 23 Apr 2026.
Lanes Closed: All lanes will be closed.
Nearest town: 2.09m from Reading.
ROAD WORKS
Location: The M4 eastbound exit slip at junction J20 (Bristol) .
Lane closures: Lane one will be closed.
Reason: Barrier repairs are planned.
Status: Pending.
Schedule: From 21:00 on 29 Apr 2026 to 06:00 on 30 Apr 2026.
Lanes Closed: There will be one of two lanes closed.
Nearest town: 2.55m from Alveston.
ROAD WORKS
Location: The M4 westbound entry slip at junction J13 (Newbury) .
Reason: Roadworks are planned.
Status: Pending.
Schedule: From 21:00 on 20 May 2026 to 06:00 on 21 May 2026.
Lanes Closed: All lanes will be closed.
Nearest town: 0.29m from Chieveley.
ROAD WORKS
Location: The M4 westbound between junctions J13 (Newbury)and J14 (Hungerford) .
Lane closures: Lanes 1,2 and 3 will be closed.
Reason: Roadworks are planned.
Status: Pending.
Schedule: From 21:00 on 20 May 2026 to 06:00 on 21 May 2026.
Lanes Closed: All lanes will be closed.
Nearest town: 0.59m from Chieveley.
ROAD WORKS
Location: The M4 westbound exit slip at junction J14 (Hungerford) .
Reason: Roadworks are planned.
Status: Pending.
Schedule: From 21:00 on 20 May 2026 to 06:00 on 21 May 2026.
Lanes Closed: All lanes will be closed.
Nearest town: 2.95m from Hungerford.

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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Description: M4 : Westbound : J48 (Pontarddulais) Hendy to J49 Pont Abraham : Congestion : Delays possible :,Start time: 22/04/2026 15:06 ,Expected end time:22/04/2026 19:06,Severity: Moderate,Source: Welsh Government,Last updated: 22/04/2026 15:06
Nearest town: 0.44m from Fforest.

51.73--4.07

Location: westbound between junctions J2 (N.Circular)and J3 (Heathrow) .

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

Due to: Vehicle fire.



Time To Clear : The event is expected to clear between 14:00 and 14:15 on 22 April 2026.

Normal traffic conditions are expected between 14:00 and 14:15 on 22 April 2026.

Lanes Closed : There is one of three lanes closed.
Nearest town: 1.89m from Hounslow.

51.49--0.38

Location: westbound between junctions J3 (Heathrow)and J4 .

Lane Closures : Lane one is closed.

Due to: Broken down vehicle.



Time To Clear : The event is expected to clear between 13:45 and 14:00 on 22 April 2026.

Normal traffic conditions are expected between 13:45 and 14:00 on 22 April 2026.

Lanes Closed : There is one of four lanes closed.
Nearest town: 1.96m from Heathrow.

51.49--0.44

Location: eastbound between junctions J18 (Bath)and J17 (Chippenham) .

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

Due to: Vehicle tyre change.



Time To Clear : The event is expected to clear between 12:00 and 12:15 on 22 April 2026.

Normal traffic conditions are expected between 12:00 and 12:15 on 22 April 2026.

Lanes Closed : There is one of three lanes closed.
Nearest town: 7.94m from Chippenham.

51.51--2.29

Description: M4 : Now clear : Eastbound : J28 (Newport) Tredegar Park to J26 (Newport) Malpas,Start time: 22/04/2026 9:58 ,Expected end time:22/04/2026 10:03,Severity: Moderate,Source: Welsh Government,Last updated: 22/04/2026 9:58
Nearest town: 0.98m from Bassaleg.

51.59--3.03

Description: M4 : Westbound : J48 (Pontarddulais) Hendy : offslip : Closed : Diversions in place :,Start time: 20/04/2026 20:00 ,End Date:24/04/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 20/04/2026 20:00
Nearest town: 0.44m from Hendy.

51.71--4.06

Description: M4 : Westbound : J43 (Neath) Llandarcy : 22/04/26-23/04/26 1930-0100 : Closed : Diversions in place : offslip : onslip :,Start time: 22/04/2026 19:30 ,End Date:23/04/2026 1:00,Severity: Road closure,Source: Welsh Government, Last updated: 19/04/2026 15:17
Nearest town: 0.02m from Llandarcy.

51.65--3.85

Description: M4 : Westbound : J22 (Avonmouth) Pilning/Prince of Wales Bridge to J23 (Chepstow) Rogiet : 22/04/26-24/04/26 2000-0600 : Closed : Diversions in place :,Start time: 22/04/2026 20:00 ,End Date:24/04/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 19/04/2026 15:06
Nearest town: 0.81m from Portskewett.

51.58--2.74

Description: M4 : Westbound : J28 (Newport) Tredegar Park to J30 (Cardiff) Cardiff Gate : 22/04/26-23/04/26 2000-0600 : Closed : Diversions in place :,Start time: 22/04/2026 20:00 ,End Date:23/04/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 19/04/2026 15:07
Nearest town: 0.58m from Castleton.

51.55--3.08

Description: M4 : Westbound : J30 (Cardiff) Cardiff Gate : 23/04/26-24/04/26 2000-0600 : offslip : Closed : Diversions in place :,Start time: 23/04/2026 20:00 ,End Date:24/04/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 19/04/2026 15:08
Nearest town: 1.77m from Saint Mellons.

51.54--3.13

Description: M4 : Eastbound : J32 (Cardiff) Coryton : 20/04/26-25/04/26 2000-0600 : offslip : Closed : Diversions in place :,Start time: 20/04/2026 20:00 ,End Date:25/04/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 20/04/2026 20:00
Nearest town: 1.51m from Llandaff.

51.53--3.25

Description: M4 : Eastbound : J33 (Cardiff) Capel Llanilltern : 23/04/26-24/04/26 2000-0600 : offslip : Closed :,Start time: 23/04/2026 20:00 ,End Date:24/04/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 19/04/2026 15:10
Nearest town: 1.63m from Pentyrch.

51.51--3.31

Description: M4 : Westbound : J35 (Pen-coed) Pencoed to J37 (Porthcawl) Pyle : Closed : Diversions in place : 21/04/26-25/04/26 2000-0600 :,Start time: 21/04/2026 20:00 ,End Date:25/04/2026 6:00,Severity: Road closure,Source: Welsh Government, Last updated: 21/04/2026 20:00
Nearest town: 2.03m from Bridgend.

51.53--3.59

Description: M4 : Eastbound : J41 (Port Talbot) Pentyla/Baglan to J40 (Port Talbot) Taibach : 23/04/26 1900-2300 : Closed : Diversions in place :,Start time: 23/04/2026 19:00 ,End Date:23/04/2026 23:00,Severity: Road closure,Source: Welsh Government, Last updated: 19/04/2026 15:14
Nearest town: 0.16m from Port Talbot.

51.6--3.78

Description: M4 : Westbound : J39 Groes to J40 (Port Talbot) Taibach : 22/04/26 1900-2300 : Closed : Diversions in place :,Start time: 22/04/2026 19:00 ,End Date:22/04/2026 23:00,Severity: Road closure,Source: Welsh Government, Last updated: 19/04/2026 15:13
Nearest town: 1.48m from Margam.

51.58--3.76

Location: eastbound exit slip at junction J4 .

Due to: Congestion.



Normal traffic conditions are expected between 14:15 and 14:30 on 22 April 2026.

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

51.5--0.45

Location: eastbound exit slip at junction J4 .

Due to: Congestion.



Normal traffic conditions are expected between 10:00 and 10:15 on 22 April 2026.
Nearest town: 2.04m from Heathrow.

51.5--0.45

Location: westbound between junctions J10 (Reading)and J11 (Basingstoke) .

Lane Closures : Lanes 1 and 2 will be closed.

Due to: Barrier repairs are planned.

Status : Pending.

Schedule : From 21:00 on 22 April 2026 to 06:00 on 23 April 2026.

Lanes Closed : There will be two of four lanes closed.
Nearest town: 2.65m from Reading.

51.42--0.95

Location: westbound at junction J11 (Basingstoke) .

Lane Closures : Lanes 1 and 2 will be closed.

Due to: Barrier repairs are planned.

Status : Pending.

Schedule : From 21:00 on 22 April 2026 to 06:00 on 23 April 2026.

Lanes Closed : There will be two of three lanes closed.
Nearest town: 2.09m from Reading.

51.41--0.97

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

Due to: Barrier repairs are planned.

Status : Pending.

Schedule : From 21:00 on 22 April 2026 to 06:00 on 23 April 2026.

Lanes Closed : All lanes will be closed.
Nearest town: 2.09m from Reading.

51.41--0.97

Location: eastbound exit slip at junction J20 (Bristol) .

Lane Closures : Lane one will be closed.

Due to: Barrier repairs are planned.

Status : Pending.

Schedule : From 21:00 on 29 April 2026 to 06:00 on 30 April 2026.

Lanes Closed : There will be one of two lanes closed.
Nearest town: 2.55m from Alveston.

51.55--2.55

Location: westbound entry slip at junction J13 (Newbury) .

Due to: Roadworks are planned.

Status : Pending.

Schedule : From 21:00 on 20 May 2026 to 06:00 on 21 May 2026.

Lanes Closed : All lanes will be closed.
Nearest town: 0.29m from Chieveley.

51.45--1.31

Location: westbound between junctions J13 (Newbury)and J14 (Hungerford) .

Lane Closures : Lanes 1,2 and 3 will be closed.

Due to: Roadworks are planned.

Status : Pending.

Schedule : From 21:00 on 20 May 2026 to 06:00 on 21 May 2026.

Lanes Closed : All lanes will be closed.
Nearest town: 0.59m from Chieveley.

51.45--1.3

Location: westbound exit slip at junction J14 (Hungerford) .

Due to: Roadworks are planned.

Status : Pending.

Schedule : From 21:00 on 20 May 2026 to 06:00 on 21 May 2026.

Lanes Closed : All lanes will be closed.
Nearest town: 2.95m from Hungerford.

51.45--1.48