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 westbound between J15 and J16 | Westbound | Road Works
Thu, 07 May 2026 20:16:44 GMT
M4 Roadworks
Location : The M4 westbound between junctions J15 and J16 . Lane Closures : Lane one will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 21:00 on 14 May 2026 to 06:00 on 15 May 2026. Lanes Closed : There will be one of three lanes closed.

M4 westbound within J11 | Westbound | Road Works
Thu, 07 May 2026 20:11:24 GMT
M4 Roadworks
Location : The M4 westbound at junction J11 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 21:00 on 14 May 2026 to 06:00 on 15 May 2026. Lanes Closed : There will be two of three lanes closed.

M4 westbound between J11 and J12 | Westbound | Road Works
Thu, 07 May 2026 20:11:24 GMT
M4 Roadworks
Location : The M4 westbound between junctions J11 and J12 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 21:00 on 14 May 2026 to 06:00 on 15 May 2026. Lanes Closed : There will be two of four lanes closed.

M4 westbound between J10 and J11 | Westbound | Road Works
Thu, 07 May 2026 20:11:24 GMT
M4 Roadworks
Location : The M4 westbound between junctions J10 and J11 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 21:00 on 14 May 2026 to 06:00 on 15 May 2026. Lanes Closed : There will be two of four lanes closed.

M4 westbound between J17 and J18 | Westbound | Road Works
Thu, 07 May 2026 20:12:48 GMT
M4 Roadworks
Location : The M4 westbound between junctions J17 and J18 . Lane Closures : Lane one will be closed. Reason : Horticultural works are planned. Status : Pending. Schedule : Expect disruption everyday between 21:00 and 06:00 from 14 May 2026 to 16 May 2026. Lanes Closed : There will be one of three lanes closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News