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 J2 and J3 | Westbound | Road Works
Tue, 09 Jun 2026 21:11:19 GMT
M4 Roadworks
Location : The M4 westbound between junctions J2 and J3 . Lane Closures : Lanes 2 and 3 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 16 June 2026 to 05:30 on 17 June 2026. Lanes Closed : There will be two of three lanes closed.

M4 J18 eastbound access | Eastbound | Road Works
Tue, 09 Jun 2026 20:26:38 GMT
M4 Roadworks
Location : The M4 eastbound entry slip at junction J18 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Horticultural works are planned. Status : Pending. Schedule : Expect disruption everyday between 21:00 and 06:00 from 16 June 2026 to 18 June 2026. Lanes Closed : All lanes will be closed.

M4 J6 eastbound access | Eastbound | Road Works
Tue, 09 Jun 2026 20:14:49 GMT
M4 Roadworks
Location : The M4 eastbound entry slip at junction J6 . Lane Closures : Lane one will be closed. Reason : Barrier repairs are planned. Status : Pending. Schedule : From 21:00 on 16 June 2026 to 06:00 on 17 June 2026. Lanes Closed : All lanes will be closed.

M4 eastbound between J19 and J18 | Eastbound | Road Works
Tue, 09 Jun 2026 20:26:39 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J19 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 16 June 2026 to 18 June 2026. Lanes Closed : There will be one of four lanes closed.

M4 eastbound between J18 and J17 | Eastbound | Road Works
Tue, 09 Jun 2026 20:26:38 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J18 and J17 . 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 16 June 2026 to 18 June 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