Map of M4 Motorway Junctions

Map of the M4 motorway junctions.

West M4

To the West the M4 joins the M5 at M4 Junction 20 which heads north to Devon Cornwall and the South West of England.

The Western end of the M4 is in South Wales Junctions 23 to 48. Bridgend is on Junctions 25 to 37, M4 Junctions 44 and 45 for Swansea, Junctions 30 to 33 for Cardiff and Junctions 24 to 28 for Newport.

East M4

At the eastern end of the M4 is London, with Junctions for Slough, Reading, Newbury, Swindon and Bristol on the way to Wales in the West.

How Do I Find M4 Traffic News?

Simply type the search words in the search facility towards the top right of this page and click "search".

M4 eastbound between J13 and J12 | Eastbound | Road Works
Thu, 14 May 2026 10:32:29 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J13 and J12 . Lane Closures : Lane three will be closed. Reason : Barrier repairs are planned. Status : Pending. Schedule : From 20:00 on 14 May 2026 to 06:00 on 15 May 2026. Lanes Closed : There will be one of three lanes closed.

M4 westbound between J12 and J13 | Westbound | Road Works
Thu, 14 May 2026 10:32:29 GMT
M4 Roadworks
Location : The M4 westbound between junctions J12 and J13 . Lane Closures : Lane three will be closed. Reason : Barrier repairs are planned. Status : Pending. Schedule : From 20:00 on 14 May 2026 to 06:00 on 15 May 2026. Lanes Closed : There will be one of three lanes closed.

M4 westbound at the Leigh Delamere services between J17 and J18 | Westbound | Congestion
Thu, 14 May 2026 09:02:43 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J17 and J18 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 10:00 and 10:15 on 14 May 2026. Cause : Accident involving an overturned vehicle. Delay : There are currently delays of 20 minutes against expected traffic.

M4 westbound at the Leigh Delamere services between J17 and J18 | Westbound | RoadOrCarriagewayOrLaneManagement
Thu, 14 May 2026 10:24:09 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J17 and J18 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Road Management. Status : Currently Active. Time To Clear : The event is expected to clear between 12:45 and 13:00 on 14 May 2026. Return To Normal : Normal traffic conditions are expected between 13:00 and 13:15 on 14 May 2026. Delay : There are currently delays of 10 minutes against expected traffic. Lanes Closed : There is one of three lanes closed. Previous R...

M4 eastbound between J13 and J12 | Eastbound | Congestion
Thu, 14 May 2026 10:26:23 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J13 and J12 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 11:30 and 11:45 on 14 May 2026. Delay : There are currently delays of 30 minutes against expected traffic.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News