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 A329(M) eastbound to M4 J10 eastbound | Eastbound | Road Works
Wed, 11 Mar 2026 21:20:50 GMT
M4 Roadworks
Location : The M4 eastbound entry slip at junction J10 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Litter clearance is planned. Status : Pending. Schedule : From 21:00 on 18 March 2026 to 06:00 on 19 March 2026. Lanes Closed : All lanes will be closed.

M4 J12 eastbound access | Eastbound | Road Works
Wed, 11 Mar 2026 21:17:25 GMT
M4 Roadworks
Location : The M4 eastbound entry slip at junction J12 . Reason : Litter clearance is planned. Status : Pending. Schedule : From 21:00 on 18 March 2026 to 06:00 on 19 March 2026. Lanes Closed : All lanes will be closed.

M4 eastbound within J22 | Eastbound | Road Works
Wed, 11 Mar 2026 20:25:57 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J23 and J22 . Reason : Roadworks scheme is planned. Status : Pending. Schedule : From 21:00 on 18 March 2026 to 06:00 on 20 March 2026.

M4 westbound between J10 and J11 | Westbound | Road Works
Wed, 11 Mar 2026 21:05:57 GMT
M4 Roadworks
Location : The M4 westbound between junctions J10 and J11 . Reason : Roadworks. Status : Currently Active. Period : from 21:04 on 11 March 2026 to 06:00 on 12 March 2026. Lanes Closed : All lanes are closed.

M4 eastbound within J12 | Eastbound | Road Works
Wed, 11 Mar 2026 21:17:25 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J13 and J12 . Lane Closures : Lane one will be closed. Reason : Litter clearance is planned. Status : Pending. Schedule : From 21:00 on 18 March 2026 to 06:00 on 19 March 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