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".

link road from M4 J20 eastbound to M5 J15 | Eastbound | Road Works
Fri, 13 Jun 2025 20:21:09 GMT
M4 Roadworks
Location : The M4 eastbound exit slip at junction J20 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadside drains works are planned. Status : Pending. Schedule : From 21:00 on 20 June 2025 to 06:00 on 21 June 2025. Lanes Closed : All lanes will be closed.

M4 eastbound between J21 and J20 | Eastbound | Road Works
Fri, 13 Jun 2025 20:21:09 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J22 and J20 . Lane Closures : Lane one will be closed. Reason : Roadside drains works are planned. Status : Pending. Schedule : From 21:00 on 20 June 2025 to 06:00 on 21 June 2025. Lanes Closed : There will be one of three lanes closed.

M4 eastbound between J8 and J7 | Eastbound | Broken down vehicle
Fri, 13 Jun 2025 17:43:20 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J8 and J7 . 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 19:15 and 19:30 on 13 June 2025. Lanes Closed : There is one of four lanes closed.

M4 westbound between J12 and J13 | Westbound | Road Works
Fri, 13 Jun 2025 19:12:38 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 20 June 2025 to 06:00 on 21 June 2025. Lanes Closed : There will be one of three lanes closed.

M4 J7 eastbound access | Eastbound | Road Works
Fri, 13 Jun 2025 20:12:58 GMT
M4 Roadworks
Location : The M4 eastbound entry slip at junction J7 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Barrier repairs are planned. Status : Pending. Schedule : From 21:00 on 20 June 2025 to 06:00 on 21 June 2025. Lanes Closed : All lanes will be closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News