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 J7 and J6 | Eastbound | Broken down vehicle
Wed, 15 Apr 2026 22:04:58 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound between junctions J7 and J6 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Broken down vehicle. Status : Currently Active. Time To Clear : The event is expected to clear between 23:45 and 00:00 on 16 April 2026. Return To Normal : Normal traffic conditions are expected between 23:45 and 00:00 on 16 April 2026. Lanes Closed : There is one of four lanes closed.

link road from A329(M) eastbound to M4 J10 eastbound | Eastbound | Road Works
Wed, 15 Apr 2026 20:44:24 GMT
M4 Roadworks
Location : The M4 eastbound entry slip at junction J10 . Reason : Roadworks. Status : Currently Active. Period : from 21:43 on 15 April 2026 to 06:00 on 16 April 2026. Lanes Closed : All lanes are closed.

M4 westbound between J7 and J8 | Westbound | Road Works
Wed, 15 Apr 2026 20:24:01 GMT
M4 Roadworks
Location : The M4 westbound between junctions J7 and J8 . Lane Closures : Lanes 1, 2 and 3 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 21:00 on 22 April 2026 to 06:00 on 23 April 2026. Lanes Closed : There will be three of four lanes closed.

link road from M4 J10 eastbound to A329(M) | Eastbound | Road Works
Wed, 15 Apr 2026 20:42:50 GMT
M4 Roadworks
Location : The M4 eastbound exit slip at junction J10 . Reason : Roadworks. Status : Currently Active. Period : from 21:42 on 15 April 2026 to 06:00 on 16 April 2026. Lanes Closed : All lanes are closed.

link road from A329(M) westbound to M4 J10 eastbound | Eastbound | Road Works
Wed, 15 Apr 2026 20:43:47 GMT
M4 Roadworks
Location : The M4 eastbound entry slip at junction J10 . Reason : Roadworks. Status : Currently Active. Period : from 21:43 on 15 April 2026 to 06:00 on 16 April 2026. Lanes Closed : All lanes are closed.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News