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 M25 J15 clockwise to M4 J4B eastbound | Eastbound | Road Works
Mon, 16 Mar 2026 22:49:53 GMT
M4 Roadworks
Location : The M4 eastbound entry slip at junction J4B from the M25 clockwise. Reason : Roadworks. Status : Currently Active. Period : from 22:49 on 16 March 2026 to 05:30 on 17 March 2026. Lanes Closed : All lanes are closed.

link road from M25 J15 clockwise to M4 J4B westbound | Westbound | Road Works
Mon, 16 Mar 2026 22:49:22 GMT
M4 Roadworks
Location : The M4 westbound entry slip at junction J4B from M25 clockwise. Reason : Roadworks. Status : Currently Active. Period : from 22:48 on 16 March 2026 to 05:30 on 17 March 2026. Lanes Closed : All lanes are closed.

M4 J22 westbound access | Westbound | Road Works
Mon, 16 Mar 2026 20:48:53 GMT
M4 Roadworks
Location : The M4 westbound entry slip at junction J22 . Reason : Roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 21:00 and 06:00 from 23 March 2026 to 25 March 2026. Lanes Closed : All lanes will be closed.

M4 westbound within J15 | Westbound | Road Works
Mon, 16 Mar 2026 21:08:19 GMT
M4 Roadworks
Location : The M4 westbound between junctions J14 and J15 . Lane Closures : Lane one will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 20:00 and 06:00 from 26 March 2026 to 28 March 2026. Lanes Closed : There will be one of three lanes closed.

M4 westbound within J22 | Westbound | Road Works
Mon, 16 Mar 2026 21:41:38 GMT
M4 Roadworks
Location : The M4 westbound at junction J22 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Road repairs are planned. Status : Pending. Schedule : From 21:00 on 26 March 2026 to 06:00 on 27 March 2026. 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