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 eastbound between J10 and J8 | Eastbound | Road Works
Thu, 12 Feb 2026 11:45:24 GMT
M4 Roadworks
Location : The M4 eastbound between junctions J10 and J8 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 20:00 and 06:00 from 14 February 2026 to 16 February 2026. Schedule : From 20:00 on 21 February 2026 to 06:00 on 22 February 2026. Lanes Closed : There will be two of four lanes closed.

M4 J8 westbound exit | Westbound | Road Works
Thu, 12 Feb 2026 11:45:23 GMT
M4 Roadworks
Location : The M4 westbound exit slip at junction J8 . Reason : Roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 20:00 and 06:00 from 14 February 2026 to 16 February 2026. Schedule : From 20:00 on 21 February 2026 to 06:00 on 22 February 2026. Lanes Closed : All lanes will be closed.

M4 eastbound within J8 | Eastbound | Road Works
Thu, 12 Feb 2026 11:45:23 GMT
M4 Roadworks
Location : The M4 eastbound at junction J8 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 20:00 and 06:00 from 14 February 2026 to 16 February 2026. Schedule : From 20:00 on 21 February 2026 to 06:00 on 22 February 2026. Lanes Closed : There will be two of three lanes closed.

M4 J8 eastbound exit | Eastbound | Road Works
Thu, 12 Feb 2026 11:45:37 GMT
M4 Roadworks
Location : The M4 eastbound exit slip at junction J8 . Reason : Roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 20:00 and 06:00 from 14 February 2026 to 16 February 2026. Schedule : From 20:00 on 21 February 2026 to 06:00 on 22 February 2026. Lanes Closed : All lanes will be closed.

M4 westbound within J8 | Westbound | Road Works
Thu, 12 Feb 2026 11:45:23 GMT
M4 Roadworks
Location : The M4 westbound at junction J8 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 20:00 and 06:00 from 14 February 2026 to 16 February 2026. Schedule : From 20:00 on 21 February 2026 to 06:00 on 22 February 2026. Lanes Closed : There will be two of three lanes closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News